kerdi membrane over osb

How do you install a Kerdi bathroom floor membrane? The first and most obvious step is to clean the OSB floor. 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. Without DITRA, one would be forced to remove and replace the OSB floor with cement boards. Wont DITRA Raise the Height of the OSB Floor? Thanks Kevin. Cut KERDI to size prior to application. Go with a masonry bench or look into the better bench or nobel bench. We just read the article in Fine Homebuilding No. It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. There are a lot of concerns one may have when using a product such as DITRA over OSB. Bring all of these elements together using the profiles and fasteners specifically designed for KERDI-BOARD assemblies. With a tray, it has to be perfectly flat and level. 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. J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. I'm of the opinion now that I'll use what's best for the stick with the subfloor. California Specification 01350 is referenced by various green building standards and rating systems. You can use a vacuum for that job. 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. KERDI is suitable for use in intermittent use steam showers. This seems to contradict what I It really is pretty easy. Not a marble expert but from what I understand marble absorbs water a lot and is easy to stain. Your saving a lot of money by doing it yourself instead of hiring it done. With KERDI-BOARD, you can build custom vanities, shelving units, bathtub surrounds, free-standing partition walls, kitchen islands, and so much more. I would not use a liquid membrane over a Kerdi tray. Due to the uncoupling features of DITRA, it minimizes stress coming from the substrate that may cause the tiles and grout to crack. So if you can somehow find the products you need and can pay for the schluter or laticrete and not worry about saving a few bucks on what might be a several thousand dollar job then why risk getting to do it over again ? We just read the article in Fine Homebuilding No. Calculate all your membrane requirements for your project. When to use Kerdi band after mortar installation? 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). Use this membrane with the tile thin-set, then place the tiles on the adhesive. Therefore, its best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating . Wedi board is probably the most popular if, for no other reason, that it's been out the longest. >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. Seams can be constructed by overlapping the edges of the KERDI 2" (5 cm) using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar, or by abutting the edges and covering the joint with KERDI-BAND using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. Can you install Kerdi board directly on studs? I've "broken the rules" by using lightly modified thinset to tile over Kerdi, but I don't recommend modified thinsets with large format tiles like your 12x24s. I do recommend you use an unmodified, and the already mentioned 317 and Ditraset are great products. I'll recommend Mapei's Kerabond as a very good unmodified thinset too. Sure, grey might be "OK," but why chance it for less than 20 bucks? Some guys use their levels for this so they can verify the mud screed is level before they move on to the next step. Since you're using a tray, I think you better get the 7/8". Im installing Schluter-KERDI over drywall in my shower. 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. Install KERDI-SEAL-PS pipe seals at showerhead, body sprays, etc. 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. Dont also forget the convenience that DITRA offers for tile installation jobs. 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. I am nearing completion of my tile shower project. A quality unmodified thinset should be used and mixed with a latex additive. ?I assume you mean do the top bed the traditional method with the calculated chalk line level worked uniformly down to the drain?? Can you use KERDI membrane on plywood floor? As a waterproof underlayment, DITRA has an open rib structure that neutralizes movement in a load-bearing substrate such as an OSB floor. I knew better than to start another thread! Our local menards has Tec, but not sure they carry that. Henry makes one called liquid backerboard that is designed to get to a feather edge over OSB or ply (I'm sure on ply, double-check over OSB). An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. 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. Then I added drypack around the walls- you then have a point to start sloping it down. Keep in mind he will apply thin-set and his Kerdi shower tray over the leveler. Cut a section of Kerdi off the roll and dry fit it on the hardie. I will give it a shot. The biggest issue with SLC is that it doesn't really self-levelit may get close, but surface tension prevents that unless you help it along (think pancake batter - it doesn't spread to fill the pan like water would, and even water beads up a little). Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right 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. Get home building tips, offers, and expert advice in your inbox. Schluter-KERDI-SEAL-PS and Schluter-KERDI-SEAL-MV are prefabricated waterproofing seals with over-molded rubber gaskets designed for protrusions through KERDI, DITRA, or DITRA-XL membranes and protect moisture-sensitive backing panels at the mixing valve. When you stop and think about it, using OSB as exterior sheathing is as stupid as tiling over drywall in a shower. If you were using a mud floor as your base, having the floor a little uneven wouldn't matter. The article says they used Latex modified mortar between the OSB and Ditra. Start your subscription today and save up to 70%. The time to dampen the Hardi is before you put thinset and tile on top. Kerdi Board is another choice with a decently long history and loyal customer base. Kerdi fix does not stick to thin-set FYI. And, I am not against trying something new. 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 A fully waterproof assembly is easily achieved by sealing seams and fastener penetrations with KERDI-BAND. "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.. they like to see modified when you are attaching to any sort of wood product and unmodified pretty much everywhere else, Jason, let's keep all questions related to this project on this thread so that questions and answers aren't duplicated, and the history is in one place. 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. Neither one absorbs moisture and both offer some interesting features (glow in the dark! It only needs about 1/8" to achieve the 1/4"/foot value. KERDI-BOARD is one of my favorite waterproofing boards because it's light, easy to cut and has lines on it for aligning the screws. Mix up the thinset with water until you get your desired consistency. Best to get the 7/8" OSB to match. I'm good front to back (32" depth). But its pretty strong, which is why it is commonly used on floors. bags at Lowe's that you can get for less than the cost of a 50lb bag. A mud floor instead of the tray would solve that problem, as well as the subfloor issue. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. No wait time is required. Thanks for the heads up Jim and Robert! Is this going to be a mud job? Well damn. That is where the DITRA uncoupling membrane comes in. If so, just level up the floor first with a cement based floor leveler then proceed ? The 10-in. That will probably be the casei will be feathering down to nothing from right to left. 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. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. 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? The combination of these four essential functions allows for the successful installation of tile over a wide range of substrates, including plywood/ OSB, concrete, gypsum, heated floors, etc. That means it will expand and shrink when exposed to water or moisture. For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc. and since the plastic did absorb any moisture . it did cure as quick and the "excess" moisture could screw up the grout. Air bubbles must be avoided. In general, unmodified thin-set mortar is a blend of Portland cement, sand, and water retention agents that is mixed with How far up the wall do I need to install the Schluter-KERDI? Tiles can be installed directly on KERDI using the thin-bed method. Other trowel-applied covering materials, such as plaster, can also be used. Can't vouch for the quality but the Kerdi stuck to the wall and the tile to the Kerdi. Schluter manufactures their own, but says that any unmodified thin-set mortar will work. The gridlines printed on the surface are helpful for neat and quick installation. vBulletin v3.7.4, Copyright 2000-2023, Jelsoft Enterprises Ltd. Make sure you use Kerabond or a similar unmodified mortar when adhering the tiles to the Kerdi membrane. If you must tape Schluter-KERDI over Solid Backing for Walls, Scott McGillivray on Waterproofing Principles using Schluter-Systems, How to Waterproof Connections to Fixed Building Elements. SawStop's Portable Tablesaw is Bigger and Better Than Before, Podcast 530: PRO TALK With Architecture Student Phillip Schladweiler, Podcast 529: Cold Floors, Galvanic Corrosion, and Siding Over Board Sheathing. 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. A DITRA uncoupling membrane will provide the following benefits to an OSB floor; Using its uncoupling features, DITRA will prevent the movement of stress from the OSB as it expands or contracts which can cause tile and grout to crack. . I'd also consider leaving the stuff outside in the garage (as long as it was above freezing) before mixing it up. Its relatively thin. Since KERDI is impervious, it does not deprive the mortar of its moisture. I need to get rid of the old trap and cap off then tie in a new trap. Leveler I would be tempted to use as s is. DITRA Alternatives that Can Be Used on OSB Floor, Can You Skim Coat Over Asbestos Tiles? The thickness of the tile assembly is minimized by using Ditra, DITRA-HEAT-DUO features an integrated bonding fleece that provides sound control, as well as a thermal break. 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? Invictus, by Henley. Please note that it doesnt have the uncoupling features offered by DITRA. Using a Prefabricated Shower Tray and Ramp. 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. DITRA should be used over OSB floors in areas where you wish to tile. 2. Since KERDI is impervious, it does not deprive the mortar of its moisture. Thanks! However if installed on drywall it is only protecting one side. Copyright 2022 Zonda Media, a Delaware Corporation. WebMembranes Waterproofing (KERDI) Uncoupling (DITRA) Removable Fleece Sound Control Exterior Systems Paver Support System Balcony Profiles Building Panels KERDI The anchoring fleece is embedded in thin-set mortar to provide a mechanical bond to the substrate. Support answered that they recommend modified. Using KERDI-BOARD to build walls over stud framing in wet areas is an efficient alternative to using gypsum board. Contact us: 888-472-4588 Over a concrete subfloor use a bonded mortar bed of appropriate thickness to build up the rest of the bathroom floor. Its essential to use the recommended products to avoid disasters. ?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? Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. Do I need to start over or can I simply repair the hole? I think cx is right. 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. ), Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar is recommended. Waterproofing corners Schluter-KERDI-KERECK. We use cookies to ensure that we give you the best experience on our website. Also, apply the acrylic mastic between the In that case, you can use DITRA in kitchens and showers with OSB floors. 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. Was in a similar situation as you and ended up with TEC uncoupling from Lowes for about $15/bag. Instead, the plywood preparation is done so that it is made water-resistant and more adhesive suitable without using a primer. clean, dry no lose paint etc. 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. You have a plastic moisture barrier behind the walls, and a PVC liner under the floor. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Point drain with integrated bonding flange. What they allow and what they recommend are two different things. The classically-inspired KERDI-DRAIN is offered in a variety of grate finishes and accommodates a wide range of tile thicknesses. How soon can I tile after installing KERDI? Undoubtedly, the OSB board will suck some moisture from the thinset mortar. Schluter-Systems does not recommend the use of premixed thin-set mortars (mastics/adhesives) in any KERDI installation. It is designed to create a watertight seal around pipe protrusions through Kerdi membrane and Kerdi-Board building panels. What material is used behind shower walls? For inside and outside corners, adhere pre-formed KERDI-KERECK-F corners. The other steps required for a successful installation are listed KERDI-BOARD can be installed both vertically and horizontally using the screws and washers in our hardware assortment. The material is equally suitable for creating level substrates in floor renovation projects e.g. That would be ideal for me right now. On the surface, OSB may look fragile. Press KERDI fully into the bond coat. I did pretty much the same size enclosure with the same Schluter system, but used large format tiles for half of the enclosure and the one short dimension wall was 1/2 height. ;). Schluter -DITRA and DITRA-XL are specifically designed for ceramic and stone tile installations. 173 and followed their instructions, laying down 3/4 OSB down and Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Schluter-KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. How long do I have to wait before I can install tile on the Schluter-KERDI membrane? Because of the benefits mentioned above, DITRA is perfect for surfaces about to be tiled over. Have you looked over the Ditra website? Yes,Kerdi can be installed on drywall or cement board. Kerdi does admit that you can use cement board. Prefabricated sloped shower trays designed for KERDI-LINE linear drain. 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. The material is physiologically safe and does not require special disposal. Mix a bit more than you think you need and get after it. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. So, heres my dilemma. First Kerdi can be installed on drywall or cement board. In high moisture areas, you can imagine that it is very important to consider this water-resistant feature and functionality so that it will help your projects be more complete. Waterproofing Corners: Schluter-KERDI-KERECK, 1. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. It is not necessary to tape the joints between drywall panels before installing KERDI. from what I first gathered the problem was with grout cracking. OSB boards have been used since 1963. Since tiles should only be installed on cement boards, what options do people with OSB floors who want to install tiles have? Did the article get this detail grotesquely wrong? Schluter-KERDI-FLEX is a flexible polyethylene waterproofing strip used to seal movement joints over DITRA in specialty applications where large movements are expected, i.e. No, the KERDI membrane does not have a front/back to it. Once you get your pics to about 600 pixels high by 400 wide, they'll upload in a snap. Glass tiles are unique products and may require special consideration. 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. Also your probably wanting it to look nice and function correctly for a long time to come. ..your opinion on shimming up the shorter pre pitch sticks?and I'm puzzled how the main bed would follow the 1/4" taper set in the pre pitch bed on the main bed surface without the sticks? Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. If that is the case, I am assuming Versabond is ok? Without a waterproof membrane like Kerdi, water and moisture can seep through grout, tile and other materials and end up damaging wood studs and subfloor. Is Kerdi band necessary? Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. The modal window is a 'site map' of the most critical areas of the site. 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? Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. 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. 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. The KERDI-SHOWER-TS features an off-center drain I have stumbled across a few articles mentioning Fusion Pro with problems on shower floors. 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. Its a lot easier to do it right the first time and cheaper also. I never had done drypack before and it was pretty simple to do. I need to run to lowes today anyways. KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. The Schluter-Shower System is an integrated family of products that together form a fully bonded, watertight assembly for tiled showers Can I use Schluter-KERDI in my steam shower? A-holes. 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. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. Both (actually, all three) methods will produce a workable shower, if done properly. 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. Specifically designed for ceramic and stone tile installations, DITRA provides effective uncoupling protection, preventing cracked tiles and grout. Silicone or sand caulk in the corners since its a change of plain. Please note that the JLC forums are now displayed read-only. This means: A minimum of 5/8 nominal plywood or OSB thickness installed over joists on 16 centers. Can you use green board for shower walls? Danny if youre worried about sweating the fittings. look into pex and compression rings if codes permit in your local. WebWhat Mortar for Schluter Kerdi & Ditra Nathan Wallace 7 years ago I am getting ready to install 12x24 tile in my shower and floor and going to be using the Kerdi membrane over OSB boards are good at sucking in moisture. A couple of questions: What color grout are you planning to use? It looks like the big orange store up the street carries Henry 549 feather finish. 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

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