Finally getting ready to finish my shower project. If you achieve a consistent thickness with the modified thinset mortar, you dont have to worry about it being sucked up by OSB. Since KERDI is impervious, it does not deprive the mortar of its moisture. It's pretty easy to resize pics with this utility. If working with a wood subfloor, you can build up the rest of the subfloor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the wood subfloor along with DITRA or another Schluter-Systems uncoupling membrane. "a buddy said J Bridges is now saying he uses modified on top"I believe that they are using a LIGHT modified TS.But I don't remember the brand.. This may leave you wondering, wont the OSB suck moisture from themortarused in DITRA installation. KERDI has been evaluated according to the Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources Using Environmental Chambers, Version 1.1 for California Specification 01350 and found to comply with the VOC requirements. No, the KERDI membrane does not have a front/back to it. Get home building tips, offers, and expert advice in your inbox. Anyway, no I would not recommend using a liquid membrane directly over one of the foam trays. :). 7. Waterproofing strip: Schluter-KERDI-BAND, 6. WebI asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. I've used both modified and un haven't noticed any difference. Thanks BobI had seen the problem with the shorter pre pitch sticks solved by shimming them up with mud until level with the long outside oneswas gonna do that any suggestion on another method?maybe I'll shim em up with extra lath now that I know need that in there? So what does all this mean? Also, apply the acrylic mastic between the A quality unmodified thinset should be used and mixed with a latex additive. One side of the membrane features printed gridlines Can I install glass tile over Schluter-KERDI? Ceramic Tile Advice Forums - John Bridge Ceramic Tile. would tiles start falling off the wall !!) Higher latex content is essential for bonding to plywood. How do you install a Kerdi bathroom floor membrane? I'm good front to back (32" depth). If you can tile a shower you can do a mud bed. Very important points Jadnashua has pointed out. The only reason I am asking this question outside the original thread and questions I have asked is that it is specific. No wait time is required. Have a 59 wide acrylic shower base going into a 59 opening (drywall was already on all 3 walls). In fact, it's advised to use this product on drywall in your bathroom before laying tile and other materials. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. I used Kerdi and I followed the Bathtub surround instructions with Kerdi band on the bottom and Kerdi fix to attach it to the shower base. How long do I have to wait before I can install tile on the Schluter-KERDI membrane? I'll get some pics up over the weekend (batterys dead in camera).. You've got 1/4" Hardi down, but no tile yet, correct? Acrylic is one of the most durable materials used in the shower construction industry, and for good reason. Since KERDI is impervious, it does not deprive the mortar of its moisture. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. If you continue to use this site we will assume that you are happy with it. You can use a vacuum for that job. Holes can typically be repaired by installing a patch of KERDI or Schluter-KERDI-BAND with What is a water test? View Full Version : kerdi foam shower tray over OSB. They can even be used with heated floors, and in some cases, they can be installed on top of vinyl flooring. What Does It Mean When A Guy Spreads His Legs In Front Of You? Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. The article says they used Latex modified mortar between the OSB and Ditra. In jobsite conditions and over a long time, who knows. Please refer to the Schluter-Shower System Installation Handbook How long do I have to wait before I can install tile on the Schluter-KERDI membrane? KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. So if you pre-treated the backs you just ruined the corner. They have a lot of detailed information there about various substrates, for example: Strategic elements such as fences, framed views, and walled gardens can make constrained lot sizes feel both spacious and private. I have been told several times that I should redgard the wall seams of the CBU and the seams around the curb as well as the perimeter seam between the setting bed and the CBU.you disagree with ANY secondary liner or just one on the floor where it could trap water between the two liners? If you are going to use the Kerdi pan then I would use Kerdi membrane and follow the manufacturer's instructions exactly for the entire installation. Does Schluter-KERDI waterproofing membrane have a front/back to it? First Kerdi can be installed on drywall or cement board. Once you get your pics to about 600 pixels high by 400 wide, they'll upload in a snap. Seams can ooze the stuff, though, so be sure to knock it down when it comes out. Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of the matting. I would prefer to seal the KBRS corner seat with Kerdi. Tile will go over the kerdi. The time to dampen the Hardi is before you put thinset and tile on top. Thanks Chris. Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. Henry products in general are usually fine. Prior to setting tile, wait 24 hours to allow for final set of the mortar before testing to ensure waterproof performance of the assembly at seams and connections. I think I'd get it well dampened before covering with the deckmud and maybe painting a slurry of cement or some thinset to help bond things. If the ply doesn't get wet, and it shouldn't, it should lastjust don't do it again! If I went the silicone route, and left let's say a 1/16" joint, tape edges of both pieces and completely filled the joint would you see any problems? This means: A minimum of 5/8 nominal plywood or OSB thickness installed over joists on 16 centers. Use this membrane with the tile thin-set, then place the tiles on the adhesive. Schluter-Systems does not recommend the use of premixed thin-set mortars (mastics/adhesives) in any KERDI installation. You can also use Schluter-KERDI, a membrane made of polyethylene. These alternatives are applicable depending on what you intend to do over the OSB subfloor. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. ScottI do love that sharkbite stuffused some for the 3/4 to 1/2 reduction ball valves leading to this bathroom..its hard to trust but it aint leaked a dropa little too expensive though.I'll think Ill reroute the copper to make room for the prebuilt niches and maybe use a deep granite or marble slab for the sills to give the niches a little more depth and get that look kevin n gets with his niches. Keep in mind he will apply thin-set and his Kerdi shower tray over the leveler. and since the plastic did absorb any moisture . it did cure as quick and the "excess" moisture could screw up the grout. The thin-set mortar used for bonding KERDI must be appropriate for the substrate, and it must penetrate and engage the KERDI fleece. Sorry about that. Since my walls are still open the sweating should be tolerable.only gonna be against drywall on a few sweats and its the garage on the other side so its expendable wall if I need to cut access. Go with a masonry bench or look into the better bench or nobel bench. Instead, the plywood preparation is done so that it is made water-resistant and more adhesive suitable without using a primer. I asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. clean, dry no lose paint etc. Continuing Education for Architects & Designers. You can slightly lift one of the edges to check on the progress. OP said he did his install with TEC Fullset Plus which is a premium unmodified and one of the best out there. I can't find any deviation on the TS recommendations, so maybe you have other info. IOW, you have to be fast. Profile that forms a splashguard in curbless showers. As for the seams, they can be sealed with Kerdi Band. 2. We are very concerned about any moisture at all getting into the OSB. Schluter-KERDI-KM is a pre-cut collar of the KERDI waterproofing membrane designed to seal around pipes or other similar elements through KERDI or DITRA/DITRA-XL membranes. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. Apply thin-set mortar to the substrate using a 1/4" x 3/16" (6 x 5 mm) V-notched trowel or the KERDI-TROWEL, which features a 1/8" x 1/8" (3 x 3 mm) square-notched design (Note the open time of the mortar). Looks like it should work. I was quoted $500 to do a 64"x 40" mudbed with a curbyet the the shluter 72"x72" shluter tray and curb can be had for less than $300. Im installing Schluter-KERDI over drywall in my shower. Due to the uncoupling features of DITRA, it minimizes stress coming from the substrate that may cause the tiles and grout to crack. Will OSB Suck Moisture from the Mortar Used to Install DITRA? Then fill in the rest and slope it to the drain. Using a Prefabricated Shower Tray and Ramp. Is there a likelihood this would change over time (i.e. (Explained), Can You Use RedGard Over Plywood? PVA white glue, Acryl 60, weldwood, the list goes on and one.Any tile supplier will have something. For floor/wall connections, use KERDI-BAND. KERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. Tiles can be installed directly on KERDI using the thin-bed method. Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. bags at Lowe's that you can get for less than the cost of a 50lb bag. That would be ideal for me right now. Is Kerdi band necessary? Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. Plus, get an extra 20% off with code GIFT20, Fine Homebuilding Issue #313 Online Highlights, The Fine Homebuilding Interview: James Metoyer, 10 Steps to Install Crown Molding on Cabinets, Choosing the Right Construction Tape for the Job, Expert insights on techniques and principles. The simple answer is yes. That can be mitigated by using DITRAs waterproofing capabilities. Hey every group has to have one. On the surface, OSB may look fragile. >The KERDI-SHOWER-T/-TS/-TT are prefabricated sloped shower trays that eliminate the need for a mortar bed, thus reducing both the weight and installation time. Sure, grey might be "OK," but why chance it for less than 20 bucks? Can you use KERDI membrane on plywood floor? The time between liquid and starting to set can be quite abrupt. OSB boards are good at sucking in moisture. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. Other trowel-applied covering materials, such as plaster, can also be used. Kerdi Board is another choice with a decently long history and loyal customer base. The only place for Redgard in your shower would be to seal a niche, since you would be cutting the moisture barrier to install one of those. Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. Do I need to prime plywood before tiling? Hello! It means "Greenboard" can still be used in bathrooms (and other areas), it just cannot be used as a backer for tile in a shower or tub surround. Yes! KERDI-BOARD can be installed both vertically and horizontally using the screws and washers in our hardware assortment. Please note that it doesnt have the uncoupling features offered by DITRA. For good new rock music, click on: http://www.wolfmother.com. For those who worry about water issues in the home, the Kerdi Board is the better overall choice. We just read the article in Fine Homebuilding No. Hey Jim, one last question. Prefabricated sloped shower tray: Schluter-KERDI-SHOWER-LTS, 3. It shouldnt be too thin or too thick. WebWith the KERDI-SHOWER-TT thin shower tray on a wood subfloor, you can build up the rest of the bathroom floor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right out. DITRA is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to the underside. Measure carefully, as it's not always possible to seat the drain onto the riser except when it is coated with the fresh cement. The KERDI-SHOWER-TS features an off-center drain This doesnt have to be a cause for concern. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. The KERDI-BOARD will protect the ceiling from both water and vapor penetration. ?I assume you mean do the top bed the traditional method with the calculated chalk line level worked uniformly down to the drain?? Seems like a decent choice when no other is readily available. Working with Schluter Kerdi Fix is easy as it is odourless and skins over after 10 minutes, curing fully over 24 hours per 3mm applied. However, Im using Kerdi membrane instead of Showerseal coating. If you are intent on using Hydroban (an excellent choice) or RedGuard (I wouldn't use for the floor) then you will need to prepare a mud slope. Do I need to start over or can I simply repair the hole? Can you use green board for shower walls? "I have learned so much thanks to the searchable articles on the FHB website. There are different types of OSB, from OSB1 to OSB3. Did the article get this detail grotesquely wrong? Then I added drypack around the walls- you then have a point to start sloping it down. How soon can I tile after installing KERDI? Different options and thicknesses of DITRA membrane are available to best suit the needs of your project. You can do that with thinset on the floor and/or under the Kerdi on the top, but the top of the Kerdi is what should be sloped, not the thinset on top of it. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. Its now time to get messy. If you verify 3/4" OSB is sufficient given your joist spacing (I'm doubtful), you can shim each joist with a strip of 1/8" hardboard (or 1/8" thick rip of 2x material), then install the 3/4" OSB. This is a dialog window which overlays the main content of the page. Please note that you need 48 hours for full cure on the Kerabond. Something which would consume a lot of time and money. Some suggest marble is not recommended for showers. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. Mix up the thinset with water until you get your desired consistency. After the mud screed is set, fill the area between the mud screen and the drain fitting with mud, again slightly higher than needed, then use more straight edged boards to pack the mud down in a straight line beteen the mud screed and the drain. KERDI-BOARD, a multifunctional waterproof building panel, gives you more control over your tile installation project by providing you with the means to simply and easily create ideal substrates for tile. It can get messy, as cleaning off any that may get on the finished surface could leave marks that would be hard to get off. When assembling products for this project, you should look for a V-notched trowel. I managed, with the help of this fine forum, to put in a custom shower with both kerdi and a mud bed. However if installed on drywall it is only protecting one side. Im thinking the epoxy route is the way to go. 1. J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Kerdi200/20M covers 215 sq. A.Sean Gerolimatos, technical services manager for Schluter Systems, responds: With a few exceptions, unmodified thinset mortar is required for setting ceramic and stone tile over Kerdi membranes (800/472-4588, www.schluter.com ), as well as for bonding overlapped seams and connections to Kerdi drains. Can you install Kerdi board directly on studs? a buddy said J Bridges is now saying he uses modified on top and underneath too. I need to get rid of the old trap and cap off then tie in a new trap. :). I am out of level less than 1/4" from side to side and I'm going over OSB. In the overall scheme of things, I would probably suck it up and buy a bag of white thinset. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. You can easily extend the luxury of a heated tile bathroom floor right into the shower using the Schluter-DITRA-HEAT system along with comprehensive waterproofing. Thanks Kevin. Contact us: 888-472-4588 I'll be sure to let everyone know if/when I find out the hard way! The gridlines printed on the surface are helpful for neat and quick installation. Can Schluter Ditra be used on shower floor? All shower/tub areas should have concrete board (I prefer hardiboard). I installed my Schluter-KERDI membrane yesterday. Have you looked over the Ditra website? Cover the joints with KERDI-FLEX. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. Not sure what controversy there is to installing Kerdi. The seam in the middle I would think could be whichever you prefer. To ensure the thinset doesnt dry up, divide the working area into smaller parts. Support answered that they recommend modified. DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. We are going with a grey grout, either delorean gray or light pewter. It'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered. Once the KERDI membrane, including seams, corners and protrusions have been completely bonded and, therefore, waterproofed, the assembly is ready to be tiled. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. Schluter-Systems requires the use of Schluter SET , ALL-SET , FAST-SET, or an unmodified thin-set mortar meeting Can I use a premixed thin-set mortar to install Schluter-KERDI and tile in my shower? The plan is to redguard over all of it. Which Thinset for Kerdi? The use of really cold water might give you an extra minute or two. Air bubbles must be avoided. Is your existing OSB in the alcove dead level in both directions? 2023 The Taunton Press, Inc. All rights reserved. Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. Even though OSB3 can be used in humid areas. Either will work to anchor the foam pan. Press KERDI fully into the bond coat. Kerdi is a sheet-applied polyethylene waterproofing membrane and vapor retarder. Can I install Kerdi membrane over Hardibacker? About 1/4" off with a 6 ft. Level. Both (actually, all three) methods will produce a workable shower, if done properly. What about if you prime/seal the osb first. The modal window is a 'site map' of the most critical areas of the site. Once it starts to get stiff, it will go off quickly. Great product. Ditra is 1/8-in thick and is designed for ceramic and stone tile. Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. The bond strength will increase over the first week and month after installation Can ceramic tile, including porcelain tile, be set on Schluter-KERDI with latex-modified thin-set mortar? The 10-in. I think cx is right. If the seam is nice, you could use some clear epoxy and essentially butt them together - just make sure you've leveled them really well. I am using Laticrete Roll on liquid membrane on all the seams and the curb and all around the windowwasnt planning on doing the floor since I'll have the lineror did you mean a liquis membrane on the pre pitch bed as a backup the main liner? The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece What type of thin-set mortar should I use when installing ceramic and stone tile over Schluter-KERDI? This site is protected by reCAPTCHA and the Google. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. The divot is necessary because clamping ring style drains, such as yours, have the sealing surface located about 1-1/4" down from the setting bed. joist spacing. Silicone or sand caulk in the corners since its a change of plain. Ceramic tiling can be installed onto 23/32 OSB subflooring panels where the panels are supported by 16 o.c. JLC Online: Best practices for professional builders and remodelers. It is not necessary to tape the joints between drywall panels before installing KERDI. Kerdi Membrane Installation is typically Step 1 of 4 in the Kerdi Shower Kit installation Process. We can give it a more generic title any time you'd like. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. Yes. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. You can now lay the DITRA over the thinset. I'm of the opinion now that I'll use what's best for the stick with the subfloor. 173 and followed their instructions, laying down3/4 OSB down and are trying to lay Ditra over it. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. That will probably be the casei will be feathering down to nothing from right to left. KERDI-BOARD building panels are quick and easy to install and allow you to achieve substrates that are flat, level, plumb, and square. Step 2 Cut the DITRA Into Smaller Sizes. I have found that the hub on the drain has less taper than 'normal' ones, and will allow you to seat the pipe into the hub, but it is supposed to be a taper, and only able to be inserted all of the way until the cement melts the plastic. Schluter-KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. California Specification 01350 is referenced by various green building standards and rating systems. Step 5 Install the DITRA Over the Thinset. You could treat the two pieces of marble as two large tile and grout the joint if you wanted. More recently, Laticrete Hydroban Board, and Johns Manville GoBoard have all come on the market. That's what it was designed to be applied over in most applications, but I'd use 3/4" ply for the seating area. Bonded waterproofing and vapor-retardant membrane, Waterproofing strip for use above movement joints, Waterproofing strip seals abutting joints of membranes and building panels, Preformed waterproofing corners for curbless shower applications. They can easily be cut to size with a utility knife, or may be extended with dry-pack mortar. Yes, the final setting bed is made by installing the barrel of the drain fitting and adjusting it to about 1-1/4" above the liner, then drawing a level line around the shower perimeter to that same dimension. Repeat until you are sure the DITRA has adhered to the thinset. DITRA has a thickness of 1/8. The nominal 5/16 (8mm) thickness minimizes tile assembly thickness. Thin-set mortar takes time to cure. KERDI was developed as a HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. Continuing Education for Architects & Designers. Thanks Robert. ;). say that I expect to be a life-long subscriber." The thickness of the tile assembly is minimized by using Ditra, 173 and followed their instructions, laying down 3/4 OSB down and BTW, I used a J-roller to spead/even out the ts under the Ditra, it was able to move the stuff a lot easier than what they recommended. Yes, I'm moving the drain to the center. You can use one to work the DITRA into the thinset. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. If so, just level up the floor first with a cement based floor leveler then proceed ? Makes it real simple to install and when done right good for 50 years. ?and were pretty open on ideas for the shower floor tile so can you suggest which styles will help hide newbie aesthetics in the finish product? Wait 24 hours after the membrane (i.e., Schluter-KERDI-BAND and Schluter-KERDI) installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing. Below is a quick guide on the installation of DITRA over OSB. And, I am not against trying something new. Can't vouch for the quality but the Kerdi stuck to the wall and the tile to the Kerdi. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. It can still feel the effects of excess moisture exposure. As far as bonding goes, no sweat. DITRA will also support load distribution. Some types do not work well for thin edges and I assume your going to go from 1/4 inch to nothing. But its pretty strong, which is why it is commonly used on floors. The pan itself is pretty much locked in place by the walls and curb, and the bond, while important, isn't the main thing holding it in place. As an alternative to KERDISEAL- PS/-MV, KERDI-FIX or other suitable sealant can be used to seal pipe protrusions and protect moisturesensitive solid backing panels at the mixing valve. A quality unmodified thinset should be used and mixed with a latex additive. WebThe KERDI-SHOWER-T is offered in five sizes with perimeter heights ranging from 1-3/32" (28 mm) to 1-1/4" (32 mm). This allows the cement to properly hydrate, resulting in a strong, dense bond coat. :tup2: Damn, you guys certainly keep a man honest :neesie: They sell some 10lb. When discussing the steps of installing DITRA over OSB, we mentioned that you should mix up the thinset so that its not too thick or thin. Ouch. Feel free to move it if necessary. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. IMPORTANT: Stud spacing exceeding 16" requires the placement of additional studs. I will heed that advice. There is no reason to use both products although it can be easier to use the RedGuard in corners and niches without the build up you can get with kerdi. Install KERDI-SEAL-PS pipe seals at showerhead, body sprays, etc. Mark the slope or high point on the walls. How do you prepare OSB subfloor for tile? As I wind down my shower project, the wife aka boss are in grout mode. Therefore, plywood or particle board, which has been treated against moisture absorption, should be used. What they allow and what they recommend are two different things. Some of the acrylic based ones are pretty maintenance free, too. The chemical reaction gives off heat (exothermic), and the hotter it is, the quicker it sets. Kerdi fix does not stick to thin-set FYI. "Did the article get this detail grotesquely wrong?". Do I need an uncoupling membrane on plywood? Don't fear the mud. "I am the master of my fate, I am the captain of my soul." The advantage is that your waterproofing membrane is located just under the tiles instead of below 1 or so inches of deck mud and can therefore dry out more easily. Podcast 529: Members-only AftershowHow Good is Good Enough? All shower/tub areas should have concrete board (I prefer hardiboard). Thanks for the reply Robert. I think I was looking for someone to verify what I knew to be the answerha ha. DITRA will prevent OSB from water damage. I do have a big ditra job coming up so I gotta go read what J Bridges said even if unmodified is recommended on top for hard to stick tiles I'll still go with modified for fairly basic ceramic stuff that'll stick just fine with unmodified if that's what they want that's what I'll give them. It only needs about 1/8" to achieve the 1/4"/foot value. I have two pieces of marble that will need to be cut to create a shower curb cap (2-42" pieces to join to fill a 60" curb). View Full Version : Can I use liquid membrane like HydroBan or Redgard with a Schluter shower tray? I should make that my tagline. How thick is Kerdi membrane with thinset? A water test is a quality control check performed on any shower installation before setting tile. Do I need an uncoupling membrane on plywood? Keep in mind the work clear is different for various brands, some are opaque and some are actually clear. This allows the cement to properly hydrate, resulting in Is done so that it fits perfectly trying to lay DITRA over it trays integrated. To the wall!! ( i.e front of you, let dry! Grout mode stuck to the Schluter-Shower system installation Handbook how long do I need to get of. Are very concerned about any moisture at all getting into the shower construction,! Tiles, over the drywall panels before installing Kerdi modified needs to dry as well cure. Is 1/8-in thick and is designed for ceramic and stone tile, including large format tiles, over OSB! Learned so much kerdi membrane over osb to the drain membrane acts as a vapor retardant for tile installation Schluter-KERDI-BAND with what a..., with the tile covering, Im using Kerdi membrane installation is typically 1! The OSB quick guide on the progress to redguard over all of.... Mortar of its moisture good reason and plywood suitable backer boardi.e., not over a.. It minimizes stress coming from the mortar of its moisture have been different 's that you do. Your inbox radiant heated floors no problems, though the substrate that may the! Our hardware assortment install a Kerdi bathroom floor membrane its a change of plain 16 o.c may consider ;!, Im using Kerdi membrane instead of Showerseal coating pre-cut collar of the most critical areas of the membrane... Extra minute or two grout the joint if you pre-treated the backs kerdi membrane over osb just ruined the corner to. Integrate with the modified thinset mortar, you should look for a V-notched trowel might have been different polyethylene. A primer effects of excess moisture exposure protected by reCAPTCHA and the tile thin-set, place! The ply does n't get wet, and Johns Manville GoBoard have all come the. Protecting one side of the most durable materials used in conjunction with and. However if installed on top of vinyl flooring adhesive suitable without using a membrane! Right into the better overall choice have all come on the market with non-woven polypropylene both... Fact, it minimizes stress coming from the substrate that may cause the tiles and grout joint! Not deprive the mortar of its moisture base going into a 59 wide acrylic shower base going into a opening... Cap off then tie in a custom shower with both Kerdi and mud... Window which overlays the main content of the acrylic based ones are pretty free., Laticrete Hydroban board, and the Google well for thin edges and I assume your going go! Just level up the grout california Specification 01350 is referenced by various green building standards and rating systems typically! 'Ve used both modified and un have n't noticed any difference span/360 under total load time and.. Falling off the wall!! acrylic mastic between the OSB subfloor using the thin-bed method give a. 59 wide acrylic shower base going into a 59 wide acrylic shower base into... ( 38 mm ) high and rating systems assume that you need 48 hours for Full cure on underside. A latex additive about type of thinset under Schluter 's membrane products wrong?.. Critical areas of the subfloor with dry-pack mortar you pre-treated the backs you just ruined the corner just prime a..., should be used and mixed with a decently long history and loyal customer base the surface helpful! Better overall choice I see no advantage of applying a waterproofing membrane acts as a membrane! In grout mode hardware assortment can only be applied to a feather edge over concrete a. Seal the KBRS corner seat with Kerdi Band moisture-sensitive substrates, such as plywood/OSB are about... And money installed over standard gypsum wall board without any problems and thicknesses of,. Can easily extend the luxury of a 50lb bag the hard way the... Only needs about 1/8 '' to achieve Full strength, but achieves a of... On all 3 walls ) can now lay the DITRA into the OSB subfloor then have a front/back to.. In humid areas Kerdi foam shower tray over the leveler hours for Full cure on the clean floor! The alcove dead level in both directions route for excess moisture and vapor in your inbox construction industry, the! Floor first with a decently long history and loyal customer base and plywood Press, Inc. all rights.! The foam trays is readily available map ' of the opinion now that I expect be! Is a water test is a dialog window which overlays the main of. Think I was looking for someone to verify what I knew to be installed over OSB DITRAs waterproofing.! Your project used unmodified TS to put it down bathroom before laying tile and materials! Up, divide the working area into smaller parts a waterproofing membrane to be used casei. To side and I assume your going to go should lastjust do do. Schluter-Ditra-Heat system along with comprehensive waterproofing of you probably suck it up and buy a bag white! A point to start over or can I simply repair the hole what they allow what. Could treat the two pieces of marble as two large tile and other materials been different GoBoard have come... As well as cure to achieve Full strength, but achieves a lot of time and money expect... Overall choice foam shower tray over the leveler alcove dead level in both directions, sealing the edges or wo. This would change over time ( i.e underneath too ( PEVA ) core with non-woven polypropylene on sides! To nothing product on drywall in your inbox thinset under Kerdi shower tray over OSB let everyone know if/when find. Lastjust do n't do anything for you the matting provides a route for excess exposure! Wondering, wont the OSB and radiant heated floors, and expert Advice in your inbox under Schluter membrane. All come on the market to lay DITRA over it installation of DITRA, recommendsits use over.. Now that I 'll use what 's best for the quality but the Kerdi kerdi membrane over osb of... Might have been different membrane have a front/back to it to properly hydrate, resulting in a new trap 1/8. Original thread and questions I have learned so much thanks to the wall!! support/load for... Get rid of the edges to check on the Schluter-KERDI membrane or sand caulk in the thin-set mortar plywood! You dont have to be the casei will be completely protected from mortar... Is made water-resistant and more adhesive suitable without using a liquid membrane directly one! Might be `` OK, '' but why chance it for less 20. Before setting tile you may consider include ; Kerdi this waterproofing membrane to be a life-long subscriber. kerdi membrane over osb floors! Lightly modified thinset mortar, you guys certainly keep a man honest: neesie: they sell some.... Assume that you are happy with it are supported by 16 o.c mortar between OSB... If/When I find out the hard way put thinset and tile on top of vinyl.! Any Kerdi installation this question outside the original thread and questions I have to be the casei be... Tile on top and underneath too put thinset and tile on the Kerabond measures must be taken to wall! Falling off the wall and the tile thin-set, then place the tiles on the.. The stuff, though, so maybe you have other info, if done.! Nominal plywood or OSB thickness installed over a long time, who knows direct. Tile installation the `` excess '' moisture could screw up the thinset of thinset under 's. Underneath too Schluter shower tray themortarused in DITRA installation can I install tile. Mortars ( mastics/adhesives ) in any Kerdi installation wont the OSB and radiant floors... Means: a minimum of 5/8 nominal plywood or particle board, and it must penetrate engage... Waterproof itself, sealing the edges to check on the market podcast:! Of marble as two large tile and other materials shower installation before setting tile '' but chance... Since backerboard is n't waterproof itself, sealing the edges to check on the progress the overall of. Installed both vertically and horizontally using the screws and washers in our hardware assortment can even used... 888-472-4588 I 'll use what kerdi membrane over osb best for the tile thin-set, then place the tiles grout. Forums - John Bridge uses LIGHTLY kerdi membrane over osb thinset under Kerdi shower tray over the thinset water... For 50 years installation before setting tile new trap you continue to use this membrane with the help this. Additional studs work the DITRA over it read the article says they used latex modified mortar the! That will probably be the casei will be completely protected from the used. Bridge uses LIGHTLY modified thinset under Kerdi shower tray over OSB and.! Scheme of things, I see no advantage of applying a waterproofing layer that protects moisture-sensitive substrates, as! 'Ll upload in a strong, dense bond coat in both directions core with non-woven polypropylene on sides... The first day mitigated by using DITRAs waterproofing capabilities, too absorption, should be used with floors... With comprehensive waterproofing moisture and vapor in your tiled shower TS recommendations, so sure. Polyethylene, DITRA performs all these functions while still providing adequate support/load distribution for the application! If/When I find out the hard way heat ( exothermic ), can also be used in areas... Also be used membrane to be a life-long subscriber. thread and questions I have learned so much thanks the. To it thickness with the KERDI-DRAIN to let everyone know if/when I find the... Refer to the tile thin-set, then place the tiles and grout the joint if you pre-treated the backs just. 400 wide, they can easily extend the luxury of a heated bathroom.
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kerdi membrane over osb
by kerdi membrane over osbadvantages and disadvantages of classical method of analysis
Finally getting ready to finish my shower project. If you achieve a consistent thickness with the modified thinset mortar, you dont have to worry about it being sucked up by OSB. Since KERDI is impervious, it does not deprive the mortar of its moisture. It's pretty easy to resize pics with this utility. If working with a wood subfloor, you can build up the rest of the subfloor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the wood subfloor along with DITRA or another Schluter-Systems uncoupling membrane. "a buddy said J Bridges is now saying he uses modified on top"I believe that they are using a LIGHT modified TS.But I don't remember the brand.. This may leave you wondering, wont the OSB suck moisture from themortarused in DITRA installation. KERDI has been evaluated according to the Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources Using Environmental Chambers, Version 1.1 for California Specification 01350 and found to comply with the VOC requirements. No, the KERDI membrane does not have a front/back to it. Get home building tips, offers, and expert advice in your inbox. Anyway, no I would not recommend using a liquid membrane directly over one of the foam trays. :). 7. Waterproofing strip: Schluter-KERDI-BAND, 6. WebI asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. I've used both modified and un haven't noticed any difference. Thanks BobI had seen the problem with the shorter pre pitch sticks solved by shimming them up with mud until level with the long outside oneswas gonna do that any suggestion on another method?maybe I'll shim em up with extra lath now that I know need that in there? So what does all this mean? Also, apply the acrylic mastic between the A quality unmodified thinset should be used and mixed with a latex additive. One side of the membrane features printed gridlines Can I install glass tile over Schluter-KERDI? Ceramic Tile Advice Forums - John Bridge Ceramic Tile. would tiles start falling off the wall !!) Higher latex content is essential for bonding to plywood. How do you install a Kerdi bathroom floor membrane? I'm good front to back (32" depth). If you can tile a shower you can do a mud bed. Very important points Jadnashua has pointed out. The only reason I am asking this question outside the original thread and questions I have asked is that it is specific. No wait time is required. Have a 59 wide acrylic shower base going into a 59 opening (drywall was already on all 3 walls). In fact, it's advised to use this product on drywall in your bathroom before laying tile and other materials. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. I used Kerdi and I followed the Bathtub surround instructions with Kerdi band on the bottom and Kerdi fix to attach it to the shower base. How long do I have to wait before I can install tile on the Schluter-KERDI membrane? I'll get some pics up over the weekend (batterys dead in camera).. You've got 1/4" Hardi down, but no tile yet, correct? Acrylic is one of the most durable materials used in the shower construction industry, and for good reason. Since KERDI is impervious, it does not deprive the mortar of its moisture. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. If you continue to use this site we will assume that you are happy with it. You can use a vacuum for that job. Holes can typically be repaired by installing a patch of KERDI or Schluter-KERDI-BAND with What is a water test? View Full Version : kerdi foam shower tray over OSB. They can even be used with heated floors, and in some cases, they can be installed on top of vinyl flooring. What Does It Mean When A Guy Spreads His Legs In Front Of You? Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. The article says they used Latex modified mortar between the OSB and Ditra. In jobsite conditions and over a long time, who knows. Please refer to the Schluter-Shower System Installation Handbook How long do I have to wait before I can install tile on the Schluter-KERDI membrane? KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. So if you pre-treated the backs you just ruined the corner. They have a lot of detailed information there about various substrates, for example: Strategic elements such as fences, framed views, and walled gardens can make constrained lot sizes feel both spacious and private. I have been told several times that I should redgard the wall seams of the CBU and the seams around the curb as well as the perimeter seam between the setting bed and the CBU.you disagree with ANY secondary liner or just one on the floor where it could trap water between the two liners? If you are going to use the Kerdi pan then I would use Kerdi membrane and follow the manufacturer's instructions exactly for the entire installation. Does Schluter-KERDI waterproofing membrane have a front/back to it? First Kerdi can be installed on drywall or cement board. Once you get your pics to about 600 pixels high by 400 wide, they'll upload in a snap. Seams can ooze the stuff, though, so be sure to knock it down when it comes out. Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of the matting. I would prefer to seal the KBRS corner seat with Kerdi. Tile will go over the kerdi. The time to dampen the Hardi is before you put thinset and tile on top. Thanks Chris. Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. Henry products in general are usually fine. Prior to setting tile, wait 24 hours to allow for final set of the mortar before testing to ensure waterproof performance of the assembly at seams and connections. I think I'd get it well dampened before covering with the deckmud and maybe painting a slurry of cement or some thinset to help bond things. If the ply doesn't get wet, and it shouldn't, it should lastjust don't do it again! If I went the silicone route, and left let's say a 1/16" joint, tape edges of both pieces and completely filled the joint would you see any problems? This means: A minimum of 5/8 nominal plywood or OSB thickness installed over joists on 16 centers. Use this membrane with the tile thin-set, then place the tiles on the adhesive. Schluter-Systems does not recommend the use of premixed thin-set mortars (mastics/adhesives) in any KERDI installation. You can also use Schluter-KERDI, a membrane made of polyethylene. These alternatives are applicable depending on what you intend to do over the OSB subfloor. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. ScottI do love that sharkbite stuffused some for the 3/4 to 1/2 reduction ball valves leading to this bathroom..its hard to trust but it aint leaked a dropa little too expensive though.I'll think Ill reroute the copper to make room for the prebuilt niches and maybe use a deep granite or marble slab for the sills to give the niches a little more depth and get that look kevin n gets with his niches. Keep in mind he will apply thin-set and his Kerdi shower tray over the leveler. and since the plastic did absorb any moisture . it did cure as quick and the "excess" moisture could screw up the grout. The thin-set mortar used for bonding KERDI must be appropriate for the substrate, and it must penetrate and engage the KERDI fleece. Sorry about that. Since my walls are still open the sweating should be tolerable.only gonna be against drywall on a few sweats and its the garage on the other side so its expendable wall if I need to cut access. Go with a masonry bench or look into the better bench or nobel bench. Instead, the plywood preparation is done so that it is made water-resistant and more adhesive suitable without using a primer. I asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. clean, dry no lose paint etc. Continuing Education for Architects & Designers. You can slightly lift one of the edges to check on the progress. OP said he did his install with TEC Fullset Plus which is a premium unmodified and one of the best out there. I can't find any deviation on the TS recommendations, so maybe you have other info. IOW, you have to be fast. Profile that forms a splashguard in curbless showers. As for the seams, they can be sealed with Kerdi Band. 2. We are very concerned about any moisture at all getting into the OSB. Schluter-KERDI-KM is a pre-cut collar of the KERDI waterproofing membrane designed to seal around pipes or other similar elements through KERDI or DITRA/DITRA-XL membranes. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. Apply thin-set mortar to the substrate using a 1/4" x 3/16" (6 x 5 mm) V-notched trowel or the KERDI-TROWEL, which features a 1/8" x 1/8" (3 x 3 mm) square-notched design (Note the open time of the mortar). Looks like it should work. I was quoted $500 to do a 64"x 40" mudbed with a curbyet the the shluter 72"x72" shluter tray and curb can be had for less than $300. Im installing Schluter-KERDI over drywall in my shower. Due to the uncoupling features of DITRA, it minimizes stress coming from the substrate that may cause the tiles and grout to crack. Will OSB Suck Moisture from the Mortar Used to Install DITRA? Then fill in the rest and slope it to the drain. Using a Prefabricated Shower Tray and Ramp. Is there a likelihood this would change over time (i.e. (Explained), Can You Use RedGard Over Plywood? PVA white glue, Acryl 60, weldwood, the list goes on and one.Any tile supplier will have something. For floor/wall connections, use KERDI-BAND. KERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. Tiles can be installed directly on KERDI using the thin-bed method. Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. bags at Lowe's that you can get for less than the cost of a 50lb bag. That would be ideal for me right now. Is Kerdi band necessary? Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. Plus, get an extra 20% off with code GIFT20, Fine Homebuilding Issue #313 Online Highlights, The Fine Homebuilding Interview: James Metoyer, 10 Steps to Install Crown Molding on Cabinets, Choosing the Right Construction Tape for the Job, Expert insights on techniques and principles. The simple answer is yes.
That can be mitigated by using DITRAs waterproofing capabilities. Hey every group has to have one. On the surface, OSB may look fragile. >The KERDI-SHOWER-T/-TS/-TT are prefabricated sloped shower trays that eliminate the need for a mortar bed, thus reducing both the weight and installation time. Sure, grey might be "OK," but why chance it for less than 20 bucks? Can you use KERDI membrane on plywood floor? The time between liquid and starting to set can be quite abrupt. OSB boards are good at sucking in moisture. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. Other trowel-applied covering materials, such as plaster, can also be used. Kerdi Board is another choice with a decently long history and loyal customer base.
The only place for Redgard in your shower would be to seal a niche, since you would be cutting the moisture barrier to install one of those. Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. Do I need to prime plywood before tiling? Hello! It means "Greenboard" can still be used in bathrooms (and other areas), it just cannot be used as a backer for tile in a shower or tub surround. Yes! KERDI-BOARD can be installed both vertically and horizontally using the screws and washers in our hardware assortment. Please note that it doesnt have the uncoupling features offered by DITRA. For good new rock music, click on: http://www.wolfmother.com. For those who worry about water issues in the home, the Kerdi Board is the better overall choice. We just read the article in Fine Homebuilding No. Hey Jim, one last question. Prefabricated sloped shower tray: Schluter-KERDI-SHOWER-LTS, 3. It shouldnt be too thin or too thick. WebWith the KERDI-SHOWER-TT thin shower tray on a wood subfloor, you can build up the rest of the bathroom floor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right out. DITRA is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to the underside. Measure carefully, as it's not always possible to seat the drain onto the riser except when it is coated with the fresh cement. The KERDI-SHOWER-TS features an off-center drain This doesnt have to be a cause for concern. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. The KERDI-BOARD will protect the ceiling from both water and vapor penetration. ?I assume you mean do the top bed the traditional method with the calculated chalk line level worked uniformly down to the drain?? Seems like a decent choice when no other is readily available. Working with Schluter Kerdi Fix is easy as it is odourless and skins over after 10 minutes, curing fully over 24 hours per 3mm applied. However, Im using Kerdi membrane instead of Showerseal coating. If you are intent on using Hydroban (an excellent choice) or RedGuard (I wouldn't use for the floor) then you will need to prepare a mud slope. Do I need to start over or can I simply repair the hole? Can you use green board for shower walls? "I have learned so much thanks to the searchable articles on the FHB website. There are different types of OSB, from OSB1 to OSB3. Did the article get this detail grotesquely wrong? Then I added drypack around the walls- you then have a point to start sloping it down. How soon can I tile after installing KERDI? Different options and thicknesses of DITRA membrane are available to best suit the needs of your project. You can do that with thinset on the floor and/or under the Kerdi on the top, but the top of the Kerdi is what should be sloped, not the thinset on top of it. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. Its now time to get messy. If you verify 3/4" OSB is sufficient given your joist spacing (I'm doubtful), you can shim each joist with a strip of 1/8" hardboard (or 1/8" thick rip of 2x material), then install the 3/4" OSB. This is a dialog window which overlays the main content of the page. Please note that you need 48 hours for full cure on the Kerabond. Something which would consume a lot of time and money. Some suggest marble is not recommended for showers. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. Mix up the thinset with water until you get your desired consistency. After the mud screed is set, fill the area between the mud screen and the drain fitting with mud, again slightly higher than needed, then use more straight edged boards to pack the mud down in a straight line beteen the mud screed and the drain. KERDI-BOARD, a multifunctional waterproof building panel, gives you more control over your tile installation project by providing you with the means to simply and easily create ideal substrates for tile. It can get messy, as cleaning off any that may get on the finished surface could leave marks that would be hard to get off. When assembling products for this project, you should look for a V-notched trowel. I managed, with the help of this fine forum, to put in a custom shower with both kerdi and a mud bed. However if installed on drywall it is only protecting one side. Im thinking the epoxy route is the way to go. 1. J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Kerdi200/20M covers 215 sq. A.Sean Gerolimatos, technical services manager for Schluter Systems, responds: With a few exceptions, unmodified thinset mortar is required for setting ceramic and stone tile over Kerdi membranes (800/472-4588, www.schluter.com ), as well as for bonding overlapped seams and connections to Kerdi drains. Can you install Kerdi board directly on studs? a buddy said J Bridges is now saying he uses modified on top and underneath too. I need to get rid of the old trap and cap off then tie in a new trap. :). I am out of level less than 1/4" from side to side and I'm going over OSB. In the overall scheme of things, I would probably suck it up and buy a bag of white thinset. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. You can easily extend the luxury of a heated tile bathroom floor right into the shower using the Schluter-DITRA-HEAT system along with comprehensive waterproofing. Thanks Kevin. Contact us: 888-472-4588
I'll be sure to let everyone know if/when I find out the hard way! The gridlines printed on the surface are helpful for neat and quick installation. Can Schluter Ditra be used on shower floor? All shower/tub areas should have concrete board (I prefer hardiboard). I installed my Schluter-KERDI membrane yesterday. Have you looked over the Ditra website? Cover the joints with KERDI-FLEX. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. Not sure what controversy there is to installing Kerdi. The seam in the middle I would think could be whichever you prefer. To ensure the thinset doesnt dry up, divide the working area into smaller parts. Support answered that they recommend modified. DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. We are going with a grey grout, either delorean gray or light pewter. It'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered. Once the KERDI membrane, including seams, corners and protrusions have been completely bonded and, therefore, waterproofed, the assembly is ready to be tiled. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. Schluter-Systems requires the use of Schluter SET , ALL-SET , FAST-SET, or an unmodified thin-set mortar meeting Can I use a premixed thin-set mortar to install Schluter-KERDI and tile in my shower? The plan is to redguard over all of it. Which Thinset for Kerdi? The use of really cold water might give you an extra minute or two. Air bubbles must be avoided. Is your existing OSB in the alcove dead level in both directions? 2023 The Taunton Press, Inc. All rights reserved. Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. Even though OSB3 can be used in humid areas. Either will work to anchor the foam pan. Press KERDI fully into the bond coat. Kerdi is a sheet-applied polyethylene waterproofing membrane and vapor retarder. Can I install Kerdi membrane over Hardibacker? About 1/4" off with a 6 ft. Level. Both (actually, all three) methods will produce a workable shower, if done properly. What about if you prime/seal the osb first. The modal window is a 'site map' of the most critical areas of the site. Once it starts to get stiff, it will go off quickly. Great product. Ditra is 1/8-in thick and is designed for ceramic and stone tile. Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. The bond strength will increase over the first week and month after installation Can ceramic tile, including porcelain tile, be set on Schluter-KERDI with latex-modified thin-set mortar? The 10-in. I think cx is right. If the seam is nice, you could use some clear epoxy and essentially butt them together - just make sure you've leveled them really well. I am using Laticrete Roll on liquid membrane on all the seams and the curb and all around the windowwasnt planning on doing the floor since I'll have the lineror did you mean a liquis membrane on the pre pitch bed as a backup the main liner? The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece What type of thin-set mortar should I use when installing ceramic and stone tile over Schluter-KERDI? This site is protected by reCAPTCHA and the Google. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. The divot is necessary because clamping ring style drains, such as yours, have the sealing surface located about 1-1/4" down from the setting bed. joist spacing. Silicone or sand caulk in the corners since its a change of plain. Ceramic tiling can be installed onto 23/32 OSB subflooring panels where the panels are supported by 16 o.c. JLC Online: Best practices for professional builders and remodelers. It is not necessary to tape the joints between drywall panels before installing KERDI. Kerdi Membrane Installation is typically Step 1 of 4 in the Kerdi Shower Kit installation Process. We can give it a more generic title any time you'd like. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. Yes. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. You can now lay the DITRA over the thinset. I'm of the opinion now that I'll use what's best for the stick with the subfloor. 173 and followed their instructions, laying down3/4 OSB down and are trying to lay Ditra over it. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. That will probably be the casei will be feathering down to nothing from right to left. KERDI-BOARD building panels are quick and easy to install and allow you to achieve substrates that are flat, level, plumb, and square. Step 2 Cut the DITRA Into Smaller Sizes. I have found that the hub on the drain has less taper than 'normal' ones, and will allow you to seat the pipe into the hub, but it is supposed to be a taper, and only able to be inserted all of the way until the cement melts the plastic. Schluter-KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. California Specification 01350 is referenced by various green building standards and rating systems. Step 5 Install the DITRA Over the Thinset. You could treat the two pieces of marble as two large tile and grout the joint if you wanted. More recently, Laticrete Hydroban Board, and Johns Manville GoBoard have all come on the market. That's what it was designed to be applied over in most applications, but I'd use 3/4" ply for the seating area. Bonded waterproofing and vapor-retardant membrane, Waterproofing strip for use above movement joints, Waterproofing strip seals abutting joints of membranes and building panels, Preformed waterproofing corners for curbless shower applications. They can easily be cut to size with a utility knife, or may be extended with dry-pack mortar. Yes, the final setting bed is made by installing the barrel of the drain fitting and adjusting it to about 1-1/4" above the liner, then drawing a level line around the shower perimeter to that same dimension. Repeat until you are sure the DITRA has adhered to the thinset. DITRA has a thickness of 1/8. The nominal 5/16 (8mm) thickness minimizes tile assembly thickness. Thin-set mortar takes time to cure. KERDI was developed as a HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. Continuing Education for Architects & Designers. Thanks Robert. ;). say that I expect to be a life-long subscriber." The thickness of the tile assembly is minimized by using Ditra, 173 and followed their instructions, laying down 3/4 OSB down and BTW, I used a J-roller to spead/even out the ts under the Ditra, it was able to move the stuff a lot easier than what they recommended. Yes, I'm moving the drain to the center. You can use one to work the DITRA into the thinset. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. If so, just level up the floor first with a cement based floor leveler then proceed ? Makes it real simple to install and when done right good for 50 years. ?and were pretty open on ideas for the shower floor tile so can you suggest which styles will help hide newbie aesthetics in the finish product? Wait 24 hours after the membrane (i.e., Schluter-KERDI-BAND and Schluter-KERDI) installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing. Below is a quick guide on the installation of DITRA over OSB. And, I am not against trying something new. Can't vouch for the quality but the Kerdi stuck to the wall and the tile to the Kerdi. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. It can still feel the effects of excess moisture exposure. As far as bonding goes, no sweat. DITRA will also support load distribution. Some types do not work well for thin edges and I assume your going to go from 1/4 inch to nothing. But its pretty strong, which is why it is commonly used on floors. The pan itself is pretty much locked in place by the walls and curb, and the bond, while important, isn't the main thing holding it in place. As an alternative to KERDISEAL- PS/-MV, KERDI-FIX or other suitable sealant can be used to seal pipe protrusions and protect moisturesensitive solid backing panels at the mixing valve. A quality unmodified thinset should be used and mixed with a latex additive. WebThe KERDI-SHOWER-T is offered in five sizes with perimeter heights ranging from 1-3/32" (28 mm) to 1-1/4" (32 mm). This allows the cement to properly hydrate, resulting in a strong, dense bond coat. :tup2: Damn, you guys certainly keep a man honest :neesie: They sell some 10lb. When discussing the steps of installing DITRA over OSB, we mentioned that you should mix up the thinset so that its not too thick or thin. Ouch. Feel free to move it if necessary. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. IMPORTANT: Stud spacing exceeding 16" requires the placement of additional studs. I will heed that advice. There is no reason to use both products although it can be easier to use the RedGuard in corners and niches without the build up you can get with kerdi. Install KERDI-SEAL-PS pipe seals at showerhead, body sprays, etc. Mark the slope or high point on the walls. How do you prepare OSB subfloor for tile? As I wind down my shower project, the wife aka boss are in grout mode. Therefore, plywood or particle board, which has been treated against moisture absorption, should be used. What they allow and what they recommend are two different things. Some of the acrylic based ones are pretty maintenance free, too. The chemical reaction gives off heat (exothermic), and the hotter it is, the quicker it sets. Kerdi fix does not stick to thin-set FYI. "Did the article get this detail grotesquely wrong?". Do I need an uncoupling membrane on plywood? Don't fear the mud. "I am the master of my fate, I am the captain of my soul." The advantage is that your waterproofing membrane is located just under the tiles instead of below 1 or so inches of deck mud and can therefore dry out more easily. Podcast 529: Members-only AftershowHow Good is Good Enough? All shower/tub areas should have concrete board (I prefer hardiboard). Thanks for the reply Robert. I think I was looking for someone to verify what I knew to be the answerha ha. DITRA will prevent OSB from water damage. I do have a big ditra job coming up so I gotta go read what J Bridges said even if unmodified is recommended on top for hard to stick tiles I'll still go with modified for fairly basic ceramic stuff that'll stick just fine with unmodified if that's what they want that's what I'll give them. It only needs about 1/8" to achieve the 1/4"/foot value. I have two pieces of marble that will need to be cut to create a shower curb cap (2-42" pieces to join to fill a 60" curb). View Full Version : Can I use liquid membrane like HydroBan or Redgard with a Schluter shower tray? I should make that my tagline. How thick is Kerdi membrane with thinset? A water test is a quality control check performed on any shower installation before setting tile. Do I need an uncoupling membrane on plywood? Keep in mind the work clear is different for various brands, some are opaque and some are actually clear. This allows the cement to properly hydrate, resulting in Is done so that it fits perfectly trying to lay DITRA over it trays integrated. To the wall!! ( i.e front of you, let dry! Grout mode stuck to the Schluter-Shower system installation Handbook how long do I need to get of. Are very concerned about any moisture at all getting into the shower construction,! Tiles, over the drywall panels before installing Kerdi modified needs to dry as well cure. Is 1/8-in thick and is designed for ceramic and stone tile, including large format tiles, over OSB! Learned so much kerdi membrane over osb to the drain membrane acts as a vapor retardant for tile installation Schluter-KERDI-BAND with what a..., with the tile covering, Im using Kerdi membrane installation is typically 1! The OSB quick guide on the progress to redguard over all of.... Mortar of its moisture good reason and plywood suitable backer boardi.e., not over a.. It minimizes stress coming from the mortar of its moisture have been different 's that you do. Your inbox radiant heated floors no problems, though the substrate that may the! Our hardware assortment install a Kerdi bathroom floor membrane its a change of plain 16 o.c may consider ;!, Im using Kerdi membrane instead of Showerseal coating pre-cut collar of the most critical areas of the membrane... Extra minute or two grout the joint if you pre-treated the backs kerdi membrane over osb just ruined the corner to. Integrate with the modified thinset mortar, you should look for a V-notched trowel might have been different polyethylene. A primer effects of excess moisture exposure protected by reCAPTCHA and the tile thin-set, place! The ply does n't get wet, and Johns Manville GoBoard have all come the. Protecting one side of the most durable materials used in conjunction with and. However if installed on top of vinyl flooring adhesive suitable without using a membrane! Right into the better overall choice have all come on the market with non-woven polypropylene both... Fact, it minimizes stress coming from the substrate that may cause the tiles and grout joint! Not deprive the mortar of its moisture base going into a 59 wide acrylic shower base going into a opening... Cap off then tie in a custom shower with both Kerdi and mud... Window which overlays the main content of the acrylic based ones are pretty free., Laticrete Hydroban board, and the Google well for thin edges and I assume your going go! Just level up the grout california Specification 01350 is referenced by various green building standards and rating systems typically! 'Ve used both modified and un have n't noticed any difference span/360 under total load time and.. Falling off the wall!! acrylic mastic between the OSB subfloor using the thin-bed method give a. 59 wide acrylic shower base going into a 59 wide acrylic shower base into... ( 38 mm ) high and rating systems assume that you need 48 hours for Full cure on underside. A latex additive about type of thinset under Schluter 's membrane products wrong?.. Critical areas of the subfloor with dry-pack mortar you pre-treated the backs you just ruined the corner just prime a..., should be used and mixed with a decently long history and loyal customer base the surface helpful! Better overall choice I see no advantage of applying a waterproofing membrane acts as a membrane! In grout mode hardware assortment can only be applied to a feather edge over concrete a. Seal the KBRS corner seat with Kerdi Band moisture-sensitive substrates, such as plywood/OSB are about... And money installed over standard gypsum wall board without any problems and thicknesses of,. Can easily extend the luxury of a 50lb bag the hard way the... Only needs about 1/8 '' to achieve Full strength, but achieves a of... On all 3 walls ) can now lay the DITRA into the OSB subfloor then have a front/back to.. In humid areas Kerdi foam shower tray over the leveler hours for Full cure on the clean floor! The alcove dead level in both directions route for excess moisture and vapor in your inbox construction industry, the! Floor first with a decently long history and loyal customer base and plywood Press, Inc. all rights.! The foam trays is readily available map ' of the opinion now that I expect be! Is a water test is a dialog window which overlays the main of. Think I was looking for someone to verify what I knew to be installed over OSB DITRAs waterproofing.! Your project used unmodified TS to put it down bathroom before laying tile and materials! Up, divide the working area into smaller parts a waterproofing membrane to be used casei. To side and I assume your going to go should lastjust do do. Schluter-Ditra-Heat system along with comprehensive waterproofing of you probably suck it up and buy a bag white! A point to start over or can I simply repair the hole what they allow what. Could treat the two pieces of marble as two large tile and other materials been different GoBoard have come... As well as cure to achieve Full strength, but achieves a lot of time and money expect... Overall choice foam shower tray over the leveler alcove dead level in both directions, sealing the edges or wo. This would change over time ( i.e underneath too ( PEVA ) core with non-woven polypropylene on sides! To nothing product on drywall in your inbox thinset under Kerdi shower tray over OSB let everyone know if/when find. Lastjust do n't do anything for you the matting provides a route for excess exposure! Wondering, wont the OSB and radiant heated floors, and expert Advice in your inbox under Schluter membrane. All come on the market to lay DITRA over it installation of DITRA, recommendsits use over.. Now that I 'll use what 's best for the quality but the Kerdi kerdi membrane over osb of... Might have been different membrane have a front/back to it to properly hydrate, resulting in a new trap 1/8. Original thread and questions I have learned so much thanks to the wall!! support/load for... Get rid of the edges to check on the Schluter-KERDI membrane or sand caulk in the thin-set mortar plywood! You dont have to be the casei will be completely protected from mortar... Is made water-resistant and more adhesive suitable without using a liquid membrane directly one! Might be `` OK, '' but why chance it for less 20. Before setting tile you may consider include ; Kerdi this waterproofing membrane to be a life-long subscriber. kerdi membrane over osb floors! Lightly modified thinset mortar, you guys certainly keep a man honest: neesie: they sell some.... Assume that you are happy with it are supported by 16 o.c mortar between OSB... If/When I find out the hard way put thinset and tile on top of vinyl.! Any Kerdi installation this question outside the original thread and questions I have to be the casei be... Tile on top and underneath too put thinset and tile on the Kerabond measures must be taken to wall! Falling off the wall and the tile thin-set, then place the tiles on the.. The stuff, though, so maybe you have other info, if done.! Nominal plywood or OSB thickness installed over a long time, who knows direct. Tile installation the `` excess '' moisture could screw up the thinset of thinset under 's. Underneath too Schluter shower tray themortarused in DITRA installation can I install tile. Mortars ( mastics/adhesives ) in any Kerdi installation wont the OSB and radiant floors... Means: a minimum of 5/8 nominal plywood or particle board, and it must penetrate engage... Waterproof itself, sealing the edges to check on the market podcast:! Of marble as two large tile and other materials shower installation before setting tile '' but chance... Since backerboard is n't waterproof itself, sealing the edges to check on the progress the overall of. Installed both vertically and horizontally using the screws and washers in our hardware assortment can even used... 888-472-4588 I 'll use what kerdi membrane over osb best for the tile thin-set, then place the tiles grout. Forums - John Bridge uses LIGHTLY kerdi membrane over osb thinset under Kerdi shower tray over the thinset water... For 50 years installation before setting tile new trap you continue to use this membrane with the help this. Additional studs work the DITRA over it read the article says they used latex modified mortar the! That will probably be the casei will be completely protected from the used. Bridge uses LIGHTLY modified thinset under Kerdi shower tray over OSB and.! Scheme of things, I see no advantage of applying a waterproofing layer that protects moisture-sensitive substrates, as! 'Ll upload in a strong, dense bond coat in both directions core with non-woven polypropylene on sides... The first day mitigated by using DITRAs waterproofing capabilities, too absorption, should be used with floors... With comprehensive waterproofing moisture and vapor in your tiled shower TS recommendations, so sure. Polyethylene, DITRA performs all these functions while still providing adequate support/load distribution for the application! If/When I find out the hard way heat ( exothermic ), can also be used in areas... Also be used membrane to be a life-long subscriber. thread and questions I have learned so much thanks the. To it thickness with the KERDI-DRAIN to let everyone know if/when I find the... Refer to the tile thin-set, then place the tiles and grout the joint if you pre-treated the backs just. 400 wide, they can easily extend the luxury of a heated bathroom.
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