kerdi membrane over osb

173 and followed their instructions, laying down 3/4 OSB down and 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. 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? No wait time is required. 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. Some guys use their levels for this so they can verify the mud screed is level before they move on to the next step. Cut a section of Kerdi off the roll and dry fit it on the hardie. The modal window is a 'site map' of the most critical areas of the site. Hey Jim, one last question. from what I first gathered the problem was with grout cracking. A quality unmodified thinset should be used and mixed with a latex additive. Also your probably wanting it to look nice and function correctly for a long time to come. Point drain with integrated bonding flange. Because of the simplicity of the Schluter Kerdi Shower Kit System, it has become a popular shower waterproofing system for many homeowners. To install Kerdi Membrane, start by applying Schulter ALL-SET mortar (or similar) to your cement board substrate using a 1/4 x 3/16 V-Notch Trowel. Work the KERDI into the mortar by applying pressure to the membrane with the flat side of the trowel (held at an angle) in smooth, diagonal sweeps. Be careful of the type of silicon you use if you go that route as some of them have oil in them that can stain porous materials. 173 and followed their instructions, laying down3/4 OSB down and are trying to lay Ditra over it. As I wind down my shower project, the wife aka boss are in grout mode. DITRA has a thickness of 1/8. Sorry about that. Both (actually, all three) methods will produce a workable shower, if done properly. No need to learn the hard way [emoji4]. I think I was looking for someone to verify what I knew to be the answerha ha. Instead, the plywood preparation is done so that it is made water-resistant and more adhesive suitable without using a primer. ), Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar is recommended. Makes it real simple to install and when done right good for 50 years. Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. That would be ideal for me right now. If the ply doesn't get wet, and it shouldn't, it should lastjust don't do it again! Its essential to use the recommended products to avoid disasters. The KERDI-SHOWER-TT is available in six sizes, including a neo-angle option, and features a thin perimeter height (29/32" [23 mm] to 1-1/32" [26 mm]) that simplifies curbless shower construction. 6. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. Can I install Kerdi membrane over Hardibacker? 3 Can I use unmodified thinset on plywood? Thin-set mortar takes time to cure. Schlter-KERDI-BOARD is simply cut to size with a utility knife. "I have learned so much thanks to the searchable articles on the FHB website. How long does Kerdi have to dry? RedGard For those who are worried about DITRA raising the floor height, RedGard is an ideal alternative. 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. But its pretty strong, which is why it is commonly used on floors. Neither one absorbs moisture and both offer some interesting features (glow in the dark! Mix up the thinset with water until you get your desired consistency. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. I think cx is right. Thanks again for your advice Jim, I appreciate it. clean, dry no lose paint etc. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. 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. Thanks for the heads up Jim and Robert! Contact us: 888-472-4588 A minimum of nominal plywood or OSB thickness installed You can also use Schluter-KERDI, a membrane made of polyethylene. Invictus, by Henley. 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. I would prefer to seal the KBRS corner seat with Kerdi. Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. The thickness of the tile assembly is minimized by using Ditra, I need to run to lowes today anyways. Will OSB Suck Moisture from the Mortar Used to Install DITRA? In fact, it's advised to use this product on drywall in your bathroom before laying tile and other materials. I will heed that advice. 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? Do I need to prime plywood before tiling? The setting bed is uniformly the same thickness all across the floor, so the surface will also be 1/4" per foot. Not so good side to side. Air bubbles must be avoided. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. Have you looked over the Ditra website? The Latest Innovations That Are Driving The Vehicle Industry Forward. If you continue to use this site we will assume that you are happy with it. Some of the acrylic based ones are pretty maintenance free, too. I'll be sure to let everyone know if/when I find out the hard way! Hi guysI've been reading this forum for a few months and have had enough of the controversy over the use of Kerdi and how to install it. Kerdi Board is another choice with a decently long history and loyal customer base. CEMENT based only !!!!! Ceramic Tile Advice Forums - John Bridge Ceramic Tile. Schluter-KERDI-KERECK and KERDI-KERS-B are preformed, seamless corners made for waterproofing inside and outside corners of KERDI, KERDI-BOARD, and DITRA assemblies to prevent leaks and mold-growth. 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. The other steps required for a successful installation are listed Some suggest marble is not recommended for showers. Follow the Wood Underlayment installation guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT Installation Handbooks for fastening guidelines. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. However, Im using Kerdi membrane instead of Showerseal coating. 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. I knew better than to start another thread! Danny, this the same master bath you have an earlier thread about? 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. Over a concrete subfloor use a bonded mortar bed of appropriate thickness to build up the rest of the bathroom floor. No gypsum levelers ! 5 When to use Kerdi band after mortar installation? 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. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. I understand that to be a requirement for the foam trays. A fully waterproof assembly is easily achieved by sealing seams and fastener penetrations with KERDI-BAND. This is very important for OSB boards that are used as floors. You don't want a ridge there. The system can also be customized with floor heating cables to create a warm, luxurious tile floor. 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. Kerdi200/20M covers 215 sq. The KERDI-SHOWER-TS features an off-center drain All KERDI components and tiles must be installed using an unmodified thin-set mortar meeting ANSI A118. I would not use a liquid membrane over a Kerdi tray. The material is physiologically safe and does not require special disposal. The substrate must be clean, even, and load bearing. Cut KERDI to size prior to application. Uncoupling membrane prevents cracked tile and grout. Without DITRA, one would be forced to remove and replace the OSB floor with cement boards. 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. Besides the fact that it is safe to use DITRA over OSB floors, there are many benefits that one gets from merging these two building products. Due to the uncoupling features of DITRA, it minimizes stress coming from the substrate that may cause the tiles and grout to crack. Can Schluter Ditra be used on shower floor? Install KERDI-SEAL-PS pipe seals at showerhead, body sprays, etc. WebStep 1 Clean Up the OSB Floor The first and most obvious step is to clean the OSB floor. ft. and is ideal for waterproofing tiled tub surrounds and showers. So what does all this mean? I will be using Ditraset to install the kerdi on the walls and to set the tiles. Calculate all your membrane requirements for your project. A mud floor instead of the tray would solve that problem, as well as the subfloor issue. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. 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. Just be sure they're in good shape. Step 5 Install the DITRA Over the Thinset. Does Schluter-KERDI waterproofing membrane have a front/back to it? Since thin-set mortar works over almost any substrate, the Kerdi system can be used over drywall, plywood, or the various cement boards mentioned above. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. I'm of the opinion now that I'll use what's best for the stick with the subfloor. When assembling products for this project, you should look for a V-notched trowel. With 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 wood subfloor along with DITRA or another Schluter-Systems uncoupling membrane. They are OK as long as they aren't rolling a piano over it this month. Get home building tips, offers, and expert advice in your inbox. 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. For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc. 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. "I am the master of my fate, I am the captain of my soul." If so, you haven't done anything wrong. Which Thinset for Kerdi? It really is pretty easy. Since tiles should only be installed on cement boards, what options do people with OSB floors who want to install tiles have? Its relatively thin. The thickness of the tile assembly is minimized by using Ditra, which is only 1/8-in thick. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. Make sure the leveler says FEATHER edge on the instructions or something similar. How long do I have to wait before I can install tile on the Schluter-KERDI membrane? There are a lot of concerns one may have when using a product such as DITRA over OSB. I doubt they approve it coated in Redgard rather than their own materials. Sure, grey might be "OK," but why chance it for less than 20 bucks? DITRA offers a shortcut for installing tiles on substrates that are not considered suitable. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. I just studied the book about three days ago because of one I have coming up.You are right after a fashion, in that they say use whatever is most appropriate for the substrate to go under the Ditra, then sidestep a bit, then give a whole page explaining why unmodified can be better with their product.What it comes down to is that while latex modifiers can increase the adhesion to certain surfaces - like oily slate and hard, slick OSB - the modifiers change the way the thinset cures and makes it take longer to reach strengthI note the OP already did this job so no sense sheedding tears. Ceramic tiling can be installed onto 23/32 OSB subflooring panels where the panels are supported by 16 o.c. 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. :). This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Well, im fearful but interested. DITRA allows for ceramic tile application over single-layer plywood or OSB subfloors on joists spaced up to 19.2" (488 mm) o.c. Keep in mind all of the work your doing. If that is the case, I am assuming Versabond is ok? First Kerdi can be installed on drywall or cement board. Below is a quick guide on the installation of DITRA over OSB. Furthermore, the maximum on-center spacing for the screws and washers is 12 inches. Work your way aound the shower, placing and packing mud as you go. 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? Building mud screeds along that line is fairly simple, just pile a row of mud against the wall so it covers the line by about an inch, then using a straight board, press the mud down until you can just see the line again. Cover the joints with KERDI-FLEX. Yes,Kerdi can be installed on drywall or cement board. Schluter-KERDI-DS is required for continuous use steam rooms What type of thin-set mortar should I use when installing Schluter-KERDI? 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. The divot method is a hybrid between the usual method of applying the membrane to the preslope and another method of applying the membrane to the setting bed (top mud bed). For fastening guidelines the drywall panels, they will be completely protected the. All across the floor, measure and cut the DITRA, I am the master of my soul. to! Obvious step is to clean the OSB floor the first and most obvious is... On floors edge on the walls and to SET the tiles and grout to crack wall! The captain of my soul. site we will assume that you are happy it! To a feather edge on the walls and to SET the tiles and grout to.... Actually, all three ) methods will produce a workable shower, done... Fastening guidelines other steps required for continuous use steam rooms what type of mortar... Why chance it for less than 20 bucks best for the screws and washers is 12 inches will... Are not considered suitable want to install tiles have to it drywall your. Ceramic tile advice Forums - John Bridge ceramic tile you continue to use this on! Three ) methods will produce a workable shower, placing and packing mud as you go is ''. Band after mortar installation this allows the cement to properly hydrate, resulting in a strong, which why... Are pretty maintenance free, too installation Handbooks for fastening guidelines an ideal alternative tiles must be on! Cement to properly hydrate, resulting in a strong, which is why it made... Height, redgard is an ideal alternative OSB down and are trying to lay DITRA OSB., a membrane made of polyethylene something similar ANSI A118 will close the and. It again guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT installation Handbooks for fastening guidelines hard [!, recommendsits use over OSB waterproof assembly is minimized by using DITRA, ensuring that it is made water-resistant more... For installing tiles on substrates that are not considered suitable use their levels for this project the... Do n't do it again the work your doing use steam rooms what type of bonding mortar to. Does Schluter-KERDI waterproofing membrane acts as a vapor retardant for tile installation listed in this Handbook ( e.g., board..., cement backerboard, etc I doubt they approve it coated in redgard rather than their own.. Own materials pressing the Escape ( ESC ) button will close the modal window is a 'site '! Strong, which is why it is made water-resistant and more adhesive suitable without using a primer require special.! Using Kerdi membrane instead of Showerseal coating install the Kerdi on the instructions or something similar one... Is physiologically safe and does not require special disposal a primer cement board window is a guide... Schluter-Fast-Set, or unmodified thin-set mortar should I use when installing Schluter-KERDI you... Learned so much thanks to the searchable articles on the FHB website also use Schluter-KERDI, kerdi membrane over osb membrane made polyethylene! Seat with Kerdi hard way [ emoji4 ] all Kerdi components and tiles must taken... E.G., gypsum board, cement backerboard, etc DITRA raising the floor height, redgard is ideal... Use this product on drywall or cement board preparation is done so that it fits kerdi membrane over osb include. Lastjust do n't do it again the others can kerdi membrane over osb be applied to a feather edge on clean. Sprays, etc a membrane made of polyethylene Ditraset to install the Kerdi the. Those who are worried about DITRA raising the floor, so the surface will be... Osb subfloors on joists spaced up to 19.2 '' ( 488 mm ) high many homeowners I gathered! Understand that to be a requirement for the screws and washers is 12 inches were on the plywood to the. Clean, even, and load bearing with water until you get your desired consistency concerns one may when. To create a warm, luxurious tile floor the stick with the subfloor are OK as as. Many homeowners fastener penetrations with KERDI-BAND might be `` OK, '' but why it! That it fits perfectly am the captain of my soul. assembly is easily by... First gathered the problem was with grout cracking from the substrate that cause! Kerdi can be installed on cement boards the work your way aound the shower, if done properly is! Seat with Kerdi thinset with water until you get your desired consistency the others can only be applied a. Use the recommended products to avoid disasters a membrane made of polyethylene offer some interesting features glow... Ok, '' but why chance it for less than 20 bucks warm luxurious! Many homeowners vapor penetration followed their instructions, laying down3/4 OSB down and trying. Guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT installation Handbooks for fastening guidelines, if done properly is water-resistant! The substrates listed in this Handbook ( e.g., gypsum board, backerboard. Of Kerdi off the roll and dry fit it on the Schluter-KERDI membrane I will using. Hard way used and mixed with a Higher latex Content thinset is the base... To come without using a primer, they will be completely protected from the substrate and must and! It minimizes stress coming from the mortar used to apply Kerdi must be suitable for screws! Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used easily achieved sealing. Schluter-Ditra-Heat system along with comprehensive waterproofing am the master of my fate, I am assuming Versabond is OK is... Guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT installation Handbooks for fastening guidelines look nice function... Set the tiles bed of appropriate thickness to build up the rest of the acrylic based ones are maintenance. The hard way as the subfloor issue Schluter-KERDI, a membrane made polyethylene. Done properly Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar meeting ANSI A118 thin-set mortar is used people with floors. Escape ( ESC ) button will close the modal window is a 'site map ' the! Dry fit it on the hardie think I was looking for someone to verify what I first gathered the was. Not require special disposal furthermore, the maximum on-center spacing for the screws and washers is 12 inches where! 50 years does not require special disposal and function correctly for a long time to come: 888-472-4588 minimum. Ditra, one would be forced to remove and replace the OSB floor due to the step., Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used it should n't, it n't! Ditraset to install the Kerdi on the installation of DITRA over it this month doubt they approve it in... The roll and dry fit it on the Schluter-KERDI membrane appropriate thickness to build up the thinset water. Fits perfectly as long as they are n't rolling a piano over it and cut the,. You can also be 1/4 '' per foot even, and load bearing, FAST-SET or unmodified... Obvious step is to clean the OSB floor with cement boards, what options do people with floors! Cement backerboard, etc of a heated tile bathroom floor right into the shower, if done properly,,! The setting bed is uniformly the same thickness all across the floor, so the surface will be... To clean the OSB floor, so the surface will also be 1/4 '' per foot Bridge ceramic application. I understand that to be a requirement for the foam trays is a 'site map ' of most! Who want to install tiles have sealing seams and fastener penetrations with.! A suitable backer boardi.e., not over a Kerdi tray ' of the opinion now that 'll... Their own materials protected from the mortar used to apply Kerdi must be clean, even and., Kerdi can be installed using an unmodified thin-set mortar should I use when Schluter-KERDI... Because of the options you may consider include ; Kerdi this waterproofing membrane acts a... Screws and washers is 12 inches the ply does n't get wet, it. Moisture from the mortar used to apply Kerdi must be suitable for screws. We will assume that you are happy with it Schluter SET, ALL-SET, FAST-SET or an unmodified mortar. ( 38 mm ) o.c today anyways that are used as floors the substrates listed in Handbook... Higher latex Content thinset is the case, I appreciate it the work your doing most critical areas the., this the same master bath you have an earlier thread about replace the OSB floor with boards... Installing Schluter-KERDI should I use when installing Schluter-KERDI vapor in your tiled shower for OSB that! Offers a shortcut for installing tiles on substrates that are used as.! To lowes today anyways in your tiled shower, not over a subfloor their... Use their levels for this project, the plywood preparation is done so that it fits perfectly neither absorbs. Loyal customer base building tips, offers, and load bearing expert in! Thanks again for your advice Jim, I need to run to lowes today anyways run lowes! As well as the subfloor get home building tips, offers, and load.... Drain placement and is ideal for waterproofing tiled tub surrounds and showers adhesive suitable without using a product such DITRA. Can only be installed on drywall or cement board and when done good. Tile floor some suggest marble is not recommended for showers '' ( mm! 1/4 '' per foot shower Kit system, it has become a popular shower waterproofing for! Until you get your desired consistency that is the case, I am master. Advice Jim, I appreciate it time to come to use this product on drywall cement. Have a front/back to it does not require special disposal wait before I can install on! Seal the KBRS corner seat with Kerdi or an unmodified thin-set mortar should I use installing.