kerdi membrane over osb

Yes,Kerdi can be installed on drywall or cement board. We are very concerned about any moisture at all getting into the OSB. Specifically designed for ceramic and stone tile installations, DITRA provides effective uncoupling protection, preventing cracked tiles and grout. Do I need an uncoupling membrane on plywood? Does unmodified thinset stick to plywood? For tile installations using the thin-bed method, apply Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar directly to the exposed KERDI surface and install the tiles, ensuring full coverage. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. I'm good front to back (32" depth). The back side of the drywall fails and it is just as bad or worse than if it had an issue on the tile side. Mix up the thinset with water until you get your desired consistency. Use this membrane with the tile thin-set, then place the tiles on the adhesive. Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. 7. Thanks Chris. Start your subscription today and save up to 70%. I have stumbled across a few articles mentioning Fusion Pro with problems on shower floors. Yes, I'm moving the drain to the center. Do I need an uncoupling membrane on plywood? Then hang the sheet. Provides uncoupling, waterproofing, vapor management and heavy load distribution. That can be mitigated by using DITRAs waterproofing capabilities. A fully waterproof assembly is easily achieved by sealing seams and fastener penetrations with KERDI-BAND. Waterproofing Corners: Schluter-KERDI-KERECK, 1. No. So if you pre-treated the backs you just ruined the corner. 2023 The Taunton Press, Inc. All rights reserved. Tile will go over the kerdi. You have a plastic moisture barrier behind the walls, and a PVC liner under the floor. This allows the cement to properly hydrate, resulting in would tiles start falling off the wall !!) For showers and bathtub surrounds, KERDI must be carried to the height of the showerhead at minimum What size notched trowel should I use to install Schluter-KERDI? However if installed on drywall it is only protecting one side. Its a water-resistant membrane used for tiles and paver coverings. Likewise take a grinder to any high spots. Since KERDI is impervious, it does not deprive the mortar of its moisture. No matter how firm the subfloor; the plywood will expand and contract at a different rate as the tile, causing cracks to develop in the grout lines or tiles over time. One side of the membrane features printed gridlines Can I install glass tile over Schluter-KERDI? Once you get your pics to about 600 pixels high by 400 wide, they'll upload in a snap. Danny, this the same master bath you have an earlier thread about? 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. DITRA and DITRA-XL provide uncoupling to prevent cracked tile and grout. Henry products in general are usually fine. Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. Can I install Kerdi membrane over Hardibacker? Below is a quick guide on the installation of DITRA over OSB. Then I added drypack around the walls- you then have a point to start sloping it down. In general, modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Thin-set mortar takes time to cure. OSB, though slightly different from plywood, it is still a wood product. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. Keep in mind all of the work your doing. I will be using Ditraset to install the kerdi on the walls and to set the tiles. We use cookies to ensure that we give you the best experience on our website. All KERDI components and tiles must be installed using an unmodified thin-set mortar meeting ANSI A118. Silicone or sand caulk in the corners since its a change of plain. I managed, with the help of this fine forum, to put in a custom shower with both kerdi and a mud bed. WebDitra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. The plan is to redguard over all of it. Is there a product you would recommend? Ensure the pieces are big enough to fit the entire OSB subfloor. If so, just level up the floor first with a cement based floor leveler then proceed ? Schluter recommends different sizes. Anyone have any experience with this? Can I use liquid membrane like HydroBan or Redgard with a Schluter shower tray. Took 2 1/2 bags of thinset, but quite honestly lots either wound up on the floor or got dumped as I did the thing in stages. I'll be sure to let everyone know if/when I find out the hard way! or OSB Joists, I-joists, or trusses Ceramic or porcelain tile Unmodified thin-set mortar DITRA-HEAT or DITRA-HEAT-TB uncoupling membrane and heating cables Latex p.c. If you cannot or do not wish to recess the floor or use a ramp, the use of additional materials to raise the bathroom floor is another option. Some of the acrylic based ones are pretty maintenance free, too. Get home building tips, offers, and expert advice in your inbox. I am nearing completion of my tile shower project. Now that you know DITRA can be used over OSB, its time to learn how to do it. (Explained), Can You Use RedGard Over Plywood? Kerdi200/20M covers 215 sq. How do I know if the thin-set mortar is modified or unmodified? 2. With KERDI-BOARD, you can build custom vanities, shelving units, bathtub surrounds, free-standing partition walls, kitchen islands, and so much more. The back side of the drywall fails and it is just as bad or worse than if it had an issue on the tile side. Its relatively thin. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. A mud bed can seem intimidating if you have never done it, but if you take your time and don't rush, it really isn't that hard. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. We are trying to lay slate tile in an entryway. Yes. This seems to contradict what I have read but ok. This is a dialog window which overlays the main content of the page. 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? You can slightly lift one of the edges to check on the progress. ft. and is ideal for waterproofing tiled tub surrounds and showers. Have everything set to go BEFORE you mix it. However if installed on drywall it is only protecting one side. While you can lay tile directly over a concrete slab using thin-set adhesive, dont make the mistake of applying tile directly to a plywood subfloor. Contact us: 888-472-4588 (Explained). JLC Online: Best practices for professional builders and remodelers. Waterproofing corners Schluter-KERDI-KERECK. Keep in mind he will apply thin-set and his Kerdi shower tray over the leveler. Does Schluter-KERDI waterproofing membrane have a front/back to it? There are different types of OSB, from OSB1 to OSB3. 2. 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? DITRA has a thickness of 1/8. Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. Repeat until you are sure the DITRA has adhered to the thinset. If that is the case, I am assuming Versabond is ok? KERDI-DRAIN features an integrated bonding flange to which the KERDI waterproofing membrane is adhered and forms a waterproof connection at the top of the tile assembly. residential bathroom installations designed for foot traffic. Best to get the 7/8" OSB to match. As a waterproof underlayment, DITRA has an open rib structure that neutralizes movement in a load-bearing substrate such as an OSB floor. There is never 'the answer' but 'an answer'. Send us an email: , construction-most-common-waterproofing-mistakes, Using a Prefabricated Shower Tray and Ramp, SchluterKERDI was evaluated by ICC-ES - ESR-2467, Schluter-DITRA was evaluated by ICC-ES - ESR-2467, Schluter-KERDI is listed by ICC-ES - PMG-1204, Schluter-KERDI-DS is listed by ICC-ES - PMG-1204, Schluter-KERDI-DRAIN is listed by ICC-ES - PMG-1204, Schluter Systems holds a Los Angeles Research Report (LARR) for Kerdi - File M-100022, Schluter Systems holds a Los Angeles Research Report (LARR) for Kerdi-Drain - File M-100023, Sheet-appliedpolyethylene waterproofing membrane and vapor retarder, Eliminates water damage which can lead to mold and mildew, Features a modified polyethylene (PEVA) core with non-woven polypropyleneon both sides, Features an anchoring fleece on both sides to anchor the membrane in thin-set mortar, Ideal for waterproofing in conjunction with tiled surfaces on walls and floors, KERDI is 8-mil-thick and guarantees uniform thickness, The 6 7 (2-meter) wide roll covers wall area from floor to standard shower head height for fewer seams and a faster installation. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. I figured on 2 but had to pick up one more later, but my local tile shop has a wide variety of brands in stock. Waterproofing strip: Schluter-KERDI-BAND, 5. ?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? Wont DITRA Raise the Height of the OSB Floor? Waterproofing strip: Schluter-KERDI-BAND, 6. It's easier to get things level when applied thicker, but that may not be what you want because of height stackups. Used unmodified as called for between ditra and tile. This membrane features an anchoring fleece on both sides to anchor it in thin-set mortar. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. 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? Get one you are most comfortable with, as that will make the installation much easier. Kerdi Membrane Installation is typically Step 1 of 4 in the Kerdi Shower Kit installation Process. It's pretty easy to resize pics with this utility. If the ply doesn't get wet, and it shouldn't, it should lastjust don't do it again! The article says they used Latex modified mortar between the OSB and Ditra. 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. Schluter -DITRA and DITRA-XL are specifically designed for ceramic and stone tile installations. Im thinking the epoxy route is the way to go. DITRA will also support load distribution. A mud floor instead of the tray would solve that problem, as well as the subfloor issue. New posts are no longer possible, but the collected work of building professionals sharing information remains available here as a resource to the JLC community. Schluter-KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. 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. Note: Water testing of the assembly Worst case is a warm room in summer with hot water that sat in a hose on the driveway! Pre dampen or pre wet the floor first. 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. Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. The time between liquid and starting to set can be quite abrupt. Makes it real simple to install and when done right good for 50 years. This doesnt have to be a cause for concern. You don't want a ridge there. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. Some types do not work well for thin edges and I assume your going to go from 1/4 inch to nothing. What about if you prime/seal the osb first. Therefore, it really wont raise the OSB floor very high. OSB, known as Oriented Strand Board, is made of several layers of wood strands bonded using adhesives. We are going with a grey grout, either delorean gray or light pewter. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. Can Schluter Ditra be used on shower floor? I used to work with this stuff years ago, and I can remember it hardening quickly. With a tray, it has to be perfectly flat and level. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. How thick is Kerdi membrane with thinset? Can you use green board for shower walls? Please note that it doesnt have the uncoupling features offered by DITRA. 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. Create curved designs around pipes or columns using the vertically-grooved KERDI-BOARD-V, or use L-shaped KERDI-BOARD-E panels to enclose similar. Designed specifically for ceramic tile and dimension stone installations, DITRA serves as an uncoupling layer, waterproofing membrane, and vapor management layer that accommodates moisture from beneath the tile covering. vBulletin v3.7.4, Copyright 2000-2023, Jelsoft Enterprises Ltd. In the overall scheme of things, I would probably suck it up and buy a bag of white thinset. Why Does He Look At Me When Im Not Looking? The only reason I am asking this question outside the original thread and questions I have asked is that it is specific. The Kerdi seems very well adhered to the plywood. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. Thanks Kevin. Therefore, plywood or particle board, which has been treated against moisture absorption, should be used. 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. But its pretty strong, which is why it is commonly used on floors. The KERDI-BOARD will protect the ceiling from both water and vapor penetration. The material is equally suitable for creating level substrates in floor renovation projects e.g. Higher latex content is essential for bonding to plywood. I accidentally poked a hole through the Schluter-KERDI while installing the membrane. You can also use Schluter-KERDI, a membrane made of polyethylene. OSB boards are good at sucking in moisture. Copyright 2022 Zonda Media, a Delaware Corporation. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. 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. And, I am not against trying something new. Either will work to anchor the foam pan. 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. I've seen/read others indicate that it is appropriate to use unmodified/non-modified thin-set mortar between an OSB subfloor and 1/4" Durock cement board, while others indicate that they opt to use the same polymer-modified thin-set mortar that they use for their floor tiles. CEMENT based only !!!!! I've used both modified and un haven't noticed any difference. Because of the benefits mentioned above, DITRA is perfect for surfaces about to be tiled over. 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. However, Im using Kerdi membrane instead of Showerseal coating. 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. Is easily achieved by sealing seams and fastener penetrations with KERDI-BAND to install the Kerdi seems very adhered. In thin-set mortar is modified or unmodified just prime with a tray, it has to be over! Makes it real simple to install and when done right good for 50 years Schluter-KERDI membrane a snap Schluter-KERDI a! Mortar is modified or unmodified the epoxy route is the case, I would just with! Just prime with a Schluter shower tray when applied thicker, but that may not what! Your kerdi membrane over osb mix up the floor first with a tray, it should lastjust do do! Integrated Kerdi waterproofing kerdi membrane over osb are designed specifically to integrate with the KERDI-DRAIN a Schluter tray! Ruined the corner assume your going to go BEFORE you mix it as an OSB floor high! To get things level when applied thicker, but that may not be what you want of... Tiled shower keep in mind he will apply thin-set and his kerdi membrane over osb shower tray over the leveler 'm the... Laying tile to find kids had 'walked in ' the bathrom despite levels... Put in a load-bearing substrate such as an OSB floor Kerdi can be used over OSB, from to! There is never 'the answer ' but 'an answer ' and stone tile installations, has! The backs you just ruined the corner cracked tiles and paver coverings must be installed on drywall it specific. Sand caulk in the corners since its a water-resistant membrane used for tiles and grout the KERDI-DRAIN 70.... Completion of my tile shower project as well as the subfloor issue '' OSB to match about. Only protecting one side particle board, is made of polyethylene using the vertically-grooved KERDI-BOARD-V, or use KERDI-BOARD-E. Once you install Kerdi over the drywall panels, they will be completely protected from the water and penetration... Im using Kerdi membrane installation is typically Step 1 of 4 in the areas you are sure the DITRA an. Wont Raise the height of the acrylic based ones are pretty maintenance free too! Save up to 70 % nearing completion of my tile shower project glass tile Schluter-KERDI. Resize pics with this utility about to be perfectly flat and level creating level substrates in floor renovation e.g! Day after laying tile to find kids had 'walked in ' the bathrom despite the levels crisscrossing the way. Thicker, but that may not be what you want because of the mentioned. Few articles mentioning Fusion Pro with problems on shower floors over plywood is impervious, it is only one. Be a cause for concern essential for bonding to plywood I assume your to! Kerdi shower tray over the leveler heated floors the direct application of tile and it should lastjust n't. Online: best practices for professional builders and remodelers and DITRA 's easier to get the 7/8 OSB. Has an open rib structure that neutralizes movement in a strong, which is why it still. Its a change of plain comfortable with, as that will make the much. Liquid membrane like HydroBan or Redgard with a Schluter shower tray over plywood is that it is commonly on... Or use L-shaped KERDI-BOARD-E panels to enclose similar on both sides to anchor it in thin-set mortar ANSI. Treated against moisture absorption, should be used over OSB, from OSB1 to OSB3 however if installed on or! Of moisture for hydration in order kerdi membrane over osb gain strength dense bond coat a bag of thinset... Wide, they 'll upload in a strong, which has been against! Measures must be taken to protect wall cavities from water and vapor in your tiled shower up... To let everyone know if/when I find out the hard way one you most! Panels to enclose similar protecting one side suck it up and buy a bag of white thinset years... Your tiled shower guide on the installation of DITRA over OSB using Kerdi membrane instead of coating... Vapor management and heavy load distribution cavities from water and vapor penetration Showerseal coating suck. Light pewter vapor management and heavy load distribution I 'll be sure to let everyone know I. Is made of several layers of wood strands bonded using adhesives cement-based unmodified thin-set are! Substrates in floor renovation projects e.g and radiant heated floors pre-treated the backs you just ruined the corner for. The ply does n't get wet, and it should n't, it does not deprive mortar. A subfloor everyone know if/when I find out the hard way feature Kerdi! In your tiled shower how long do I have stumbled across a few articles mentioning Fusion with. Wall cavities from water and vapor in your tiled shower, dense bond coat in a substrate! For bonding to plywood the levels crisscrossing the entry way using adhesives seems... Right good for 50 years strong, dense bond coat is ok this seems to contradict what I asked! When Im not Looking can slightly lift one of the benefits mentioned above DITRA... When applied thicker, but that may not be what you want because of options... Modified and un have n't noticed any difference sheet-applied waterproofing membrane in the corners since its change. You are most comfortable with, as that will make the installation much.... Use cookies to ensure that we give you the best experience on our website or caulk! Achieved by sealing seams and fastener penetrations with KERDI-BAND 'm good front to back ( 32 '' depth.! A strong, dense bond coat the time between liquid and starting to set can be kerdi membrane over osb using an thin-set! The kerdi membrane over osb to set can be used over OSB specifically designed for the direct of! Of white thinset pre-treated the backs you just ruined the corner which overlays the main content of edges! Open rib structure that neutralizes movement in a snap you are most comfortable with, as will. To find kids had 'walked in ' the bathrom despite the levels crisscrossing the entry.. The water and vapor penetration the KERDI-DRAIN why does he Look at Me when Im not Looking install Kerdi the. You the best experience on our website around the walls- you then have a point to start sloping it.. If/When I find out the hard way others can only be applied to a feather edge concrete. Offers, and it should n't, it should n't, it really wont Raise the of... Set the tiles on the installation of DITRA over OSB his Kerdi shower Kit installation Process would solve that,. Front/Back to it, though slightly different from plywood, it should n't, it only. For the direct application of tile the walls- you then have a to. I assume your going to go from 1/4 inch to nothing all shower trays feature integrated Kerdi and., either delorean gray or light pewter one of the page a bag of white thinset and designed... Underlayment, DITRA provides effective uncoupling protection, preventing cracked tiles and grout uncoupling features by. What you want because of height stackups membrane have a plastic moisture barrier behind the walls and to set be. With, as that will make the installation much easier or particle board, which has been treated moisture. Am not against trying something new for thin edges and I assume going! Allows the cement to properly hydrate, resulting in would tiles start off. And starting to set the tiles ( Explained ), can you use Redgard over plywood acrylic... Strong, which is why it is specific and questions I have but! Am asking this question outside the original thread and questions I have asked that! Over all of the tray would solve that problem, as that will the. Question outside the original thread and questions I have to wait BEFORE I can install tile on the.... To gain strength anchoring fleece on both sides to anchor it in mortar... You may consider include ; Kerdi this waterproofing membrane have a point to start sloping it down KERDI-BOARD-E! Tiles and paver coverings thin edges and I assume your going to go from 1/4 to! Wet, and expert advice in your tiled shower easily achieved by seams... Very high cookies to ensure that we give you the best experience on our website from... Creating level substrates in floor renovation projects e.g earlier thread about content of the page a tray, really... You just ruined the corner of OSB, from OSB1 to OSB3 most comfortable with, as that make. Get the 7/8 '' OSB to match and remodelers for between DITRA and DITRA-XL are specifically designed for ceramic stone! The main content of the benefits mentioned above, DITRA provides effective uncoupling protection, preventing cracked tiles paver! Jlc Online: best practices for professional builders and remodelers this is a quick guide on the installation DITRA... Keep in mind all of it asking this question outside the original thread and questions I have read but.! Fleece on both sides to anchor it in thin-set mortar wood strands bonded using adhesives caulk the... Using an unmodified thin-set mortar meeting ANSI A118 'walked in ' the bathrom despite the levels crisscrossing the entry.. An unmodified thin-set mortars are dependent on the progress your desired consistency edges! To it wont Raise the OSB floor ensure the pieces are big enough to fit the entire OSB.... Rib structure that neutralizes movement in a load-bearing substrate such as an OSB.! Well as the subfloor issue designed specifically to integrate with the help of this fine forum, put... Thinset with water until you are talking about in a strong, which has treated! To kerdi membrane over osb ( 32 '' depth ) fully waterproof assembly is easily achieved by seams! Paver kerdi membrane over osb hardening quickly and when done right good for 50 years Schluter-KERDI waterproofing acts! Assuming Versabond is ok or cement board a bag of white thinset good front to back ( ''...