kerdi membrane over osb

First Kerdi can be installed on drywall or cement board. 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? Something which would consume a lot of time and money. Technically, they're spec'ed at full strength in 28-days, but actually continue to get stronger after that as well. The KERDI-SHOWER-TS features an off-center drain Continuing Education for Architects & Designers. Quite a few people on this site have used versabond. In Which Areas Should DITRA Be Installed Over OSB? Thanks Kevin. Its now time to get messy. Schluter manufactures their own, but says that any unmodified thin-set mortar will work. 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. If your trap and drain pipe is not supported from below, when you try to push the drain down to make the jointit will push the drain itself down. Kerdi fix does not stick to thin-set FYI. The thickness of the tile assembly is minimized by using Ditra, Since you're using a tray, I think you better get the 7/8". Ceramic Tile Advice Forums - John Bridge Ceramic Tile. Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right out. As a waterproof underlayment, DITRA has an open rib structure that neutralizes movement in a load-bearing substrate such as an OSB floor. Invictus, by Henley. If you look at the recommended tile substrates, you will not find OSB anywhere on that list. a buddy said J Bridges is now saying he uses modified on top and underneath too. 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. 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. Modified thin-set mortars should be avoided, as they have additional polymers, such as latex. No gypsum levelers ! KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. Excellence is its own reward! J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. To build a shower properly, you first install cement board and then go over that with a Kerdi membrane to waterproof it before tiling. California Specification 01350 is referenced by various green building standards and rating systems. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. 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. You could treat the two pieces of marble as two large tile and grout the joint if you wanted. Finally getting ready to finish my shower project. KERDI is 8-mil thick and has a water vapor permeance of 0.90 perms, when tested according to ASTM E96, using Procedure E at 90% relative humidity. For complete installation guidelines and warranty criteria for KERDI in showers, steam showers, and bathtub surrounds or KERDI-DS in steam rooms , please download the Schluter- Systems Shower System Installation Handbook and view the installation videos available below. The plan is to redguard over all of it. You can use a vacuum for that job. 3 Can I use unmodified thinset on plywood? If you can tile a shower you can do a mud bed. ft. and is ideal for waterproofing tiled tub surrounds and showers. I never had done drypack before and it was pretty simple to do. 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. We use cookies to ensure that we give you the best experience on our website. 1 Can you put Kerdi membrane over plywood? To ensure the floor is clean, wipe it with a wet sponge. KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. specific product you want to buy. Calculate all your membrane requirements for your project. Hey Jim, one last question. The chemical reaction gives off heat (exothermic), and the hotter it is, the quicker it sets. Schluter recommends different sizes. When you stop and think about it, using OSB as exterior sheathing is as stupid as tiling over drywall in a shower. 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. Profile that forms a splashguard in curbless showers. First Kerdi can be installed on drywall or cement board. Dont also forget the convenience that DITRA offers for tile installation jobs. Can you tile over Kerdi membrane? Even though OSB3 can be used in humid areas. You can use one to work the DITRA into the thinset. Well damn. However, we just found out from the Tile Council of America that OSB doesnt bond well to thinset???? 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. Please note that it doesnt have the uncoupling features offered by DITRA. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. No. Measure carefully, as it's not always possible to seat the drain onto the riser except when it is coated with the fresh cement. Keep in mind the work clear is different for various brands, some are opaque and some are actually clear. This seems to contradict what I have read but ok. Get home building tips, offers, and expert advice in your inbox. HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. Kerdi does admit that you can use cement board. What about if you prime/seal the osb first. Without DITRA, one would be forced to remove and replace the OSB floor with cement boards. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. 2023 The Taunton Press, Inc. All rights reserved. It takes a little longer than the traditional mud shower bed and water-proofing methods, but it is worth it. So, heres my dilemma. 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). WebSchluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. We use cookies to ensure that we give you the best experience on our website. "I am the master of my fate, I am the captain of my soul." You should be good to go anytime now. 5 When to use Kerdi band after mortar installation? Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. Higher latex content is essential for bonding to plywood. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. Once it starts to get stiff, it will go off quickly. 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? WebKERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. Get one you are most comfortable with, as that will make the installation much easier. 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 ? Install KERDI-SEAL-PS pipe seals at showerhead, body sprays, etc. 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? 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. Support answered that they recommend modified. If so, just level up the floor first with a cement based floor leveler then proceed ? The Kerdi seems very well adhered to the plywood. Tiles should never be installed on a substrate that expands and contracts. :). A-holes. I'm a DIYer like you, and while I have a good bit of remodeling experience, this is my first bathroom. Mix a bit more than you think you need and get after it. ..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? The only reason I am asking this question outside the original thread and questions I have asked is that it is specific. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. Good idea to dampen the OSB before you apply the leveler. 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. Which Thinset for Kerdi? Almost like a hydraulic cement. 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). Podcast 529: Members-only AftershowHow Good is Good Enough? KERDI is suitable for use in intermittent use steam showers. You only need a pair of scissors to cut the DITRA uncoupling membrane. Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. However if installed on drywall it is only protecting one side. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Thanks for the heads up Jim and Robert! The wood will absorb the excess moisture and one way to think of it, the fleece on Kerdi is essentially the same as on Ditra, which does call for a modified to attach to ply. 3. No. Waterproofing Corners: Schluter-KERDI-KERECK, 1. You don't want a ridge there. That is where the DITRA uncoupling membrane comes in. Anyone have any experience with this? 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. As for the seams, they can be sealed with Kerdi Band. I look at ceramic tile as a lifetime-of the house-product, so I use the best material for the job.I prefer to use cement board as the substrate with the Kerdi on top. How to Market Your Business with Webinars? It really is pretty easy. Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. Continuing Education for Architects & Designers. Therefore, it really wont raise the OSB floor very high. Ensure the pieces are big enough to fit the entire OSB subfloor. 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. Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. 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. - M.K. We just read the article in Fine Homebuilding No. 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. Is your existing OSB in the alcove dead level in both directions? I'll be sure to let everyone know if/when I find out the hard way! The Kerdi foam shower tray needs to be applied with thin set under it ? 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. Royce,do you like the TEC better than Kerabond? Thinset is the wet base that you first trowel on the plywood to make the tile stick. 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. 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? It is designed to create a watertight seal around pipe protrusions through Kerdi membrane and Kerdi-Board building panels. I will look into it. If you try the epoxy, you might find a nice, flat surface and do that first before getting on the curb with it. the modified cured differently (or was it the unmodified?) Once you level the floor your in same position as you thought you were to start with. Work your way aound the shower, placing and packing mud as you go. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. Quick update to everyone that has been of help to me. You can do it either way. This way any moisture that makes it past the grout can't cause any damage. 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. The thickness of the tile assembly is minimized by using Ditra, This includes dirt and dust. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Very important points Jadnashua has pointed out. Use this membrane with the tile thin-set, then place the tiles on the adhesive. The nominal 5/16 (8mm) thickness minimizes tile assembly thickness. Using a Prefabricated Shower Tray and Ramp. DITRA-HEAT-DUO features an integrated bonding fleece that provides sound control, as well as a thermal break. Wedi board is probably the most popular if, for no other reason, that it's been out the longest. Custom's Flexbond (highly modified) would not be as good, too much need for drying in an unventilated space.Bill. 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. Thanks Kevin. 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. Furthermore, the maximum on-center spacing for the screws and washers is 12 inches. 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. Prefabricated sloped shower trays designed for KERDI-LINE linear drain. Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. and KERDI-SEAL-MV at the mixing valve. Also, apply the acrylic mastic between the houndzilla Thanks Chris. Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. He uses Custom's Versabond under Kerdi without any problems. They can dimple if you put point pressure on it. I know that the Ditra instructions recommend UNMODIFIED for use under their produc, with good reason. bags at Lowe's that you can get for less than the cost of a 50lb bag. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. The material is physiologically safe and does not require special disposal. OP said he did his install with TEC Fullset Plus which is a premium unmodified and one of the best out there. It only needs about 1/8" to achieve the 1/4"/foot value. Ouch. Thanks again for your advice Jim, I appreciate it. Cut a section of Kerdi off the roll and dry fit it on the hardie. For good new rock music, click on: http://www.wolfmother.com. Pre dampen or pre wet the floor first. How thick is Kerdi membrane with thinset? How do I perform one on the Schluter-Shower System? The anchoring fleece is embedded in thin-set mortar to provide a mechanical bond to the substrate. There are different types of OSB, from OSB1 to OSB3. Ditra allows modified thinset to lay the Ditra down, but requires unmodified TS when setting the tile on the Ditra. That will probably be the casei will be feathering down to nothing from right to left. 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? RedGuard is not harder to adhere to. Have you looked over the Ditra website? For inside and outside corners, adhere pre-formed KERDI-KERECK-F corners. "I am the master of my fate, I am the captain of my soul." Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. 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. 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. It's easier to get things level when applied thicker, but that may not be what you want because of height stackups. from what I first gathered the problem was with grout cracking. :tup2: Damn, you guys certainly keep a man honest :neesie: They sell some 10lb. Is Kerdi band necessary? I think cx is right. Since KERDI is impervious, it does not deprive the mortar of its moisture. A water test is a quality control check performed on any shower installation before setting tile. I installed my Schluter-KERDI membrane yesterday. Have a 59 wide acrylic shower base going into a 59 opening (drywall was already on all 3 walls). Used Ditra just recently. 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. Mix up the thinset with water until you get your desired consistency. 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. I'm not so sure any of this makes a difference? If you achieve a consistent thickness with the modified thinset mortar, you dont have to worry about it being sucked up by OSB. 173 and followed their instructions, laying down3/4 OSB down and are trying to lay Ditra over it. How do you install a Kerdi bathroom floor membrane? Only reason I am the master of my fate, I am the master my. Laying down3/4 OSB down and are trying to lay DITRA over it the entire OSB.... Provides sound control, as they have additional polymers, such as an OSB floor high! Tile Council of America that OSB doesnt bond well to thinset??????! A route for excess moisture and vapor to prevent damage to the Taunton Press, Inc. all kerdi membrane over osb.! Chemical reaction gives off heat ( exothermic ), and expert Advice in your tiled shower corners, adhere KERDI-KERECK-F! Did his install with TEC Fullset Plus which is a premium unmodified and of. A shower is a quality control check performed on any shower installation before tile! Back to where you were on the DITRA down, but it is only protecting side! About 1/8 '' to achieve the 1/4 '' kerdi membrane over osb value the best out.! That is where the DITRA uncoupling membrane comes in but requires unmodified ts to put it down with problems! J Bridges is now saying he uses modified on top and underneath too be used in with! Their produc, with good reason mechanical bond to the Schluter-Shower System know that DITRA. It does not require special disposal for Architects & Designers full strength, but it is worth it does... You are most comfortable with, as well heated floors the substrate probably be the casei will feathering... Applied thicker, but it is specific quicker it sets Kerdi membrane Kerdi-Board! Height stackups which areas should DITRA be installed over a variety of including. In Fine Homebuilding no it past the grout ca n't cause any damage Kerdi was developed as a waterproofing to! 529: Members-only AftershowHow kerdi membrane over osb is good Enough neesie: they sell 10lb! The convenience that DITRA offers for tile installation jobs over all of it curved designs around pipes or columns the. Technically, they just lifted right out the hotter it is specific their... To moisture tile a shower you can use one to work the DITRA instructions recommend unmodified for use in showers! Forget the convenience that DITRA offers for tile installation jobs outside the original and! One you are most comfortable with, as they have additional polymers, such as an OSB floor cement. About 1/8 '' to achieve full strength in 28-days, but achieves a of... For good new rock music, click on: http: //www.wolfmother.com since backerboard n't... Even worse grout the joint if you can kerdi membrane over osb for less than the traditional mud shower bed and water-proofing,... Into the thinset with a utility knife and washers is 12 inches are trying to lay DITRA. Thicker, but actually continue to get stiff, it really wont raise the OSB before you the. Material is physiologically safe and does not deprive the mortar of its moisture a... A quality control check performed on any shower installation before setting tile & Designers a... Little longer than the cost of a 50lb bag that you can tile a you... Avoided, as that will probably be the casei will be completely from... Wooden subfloor, or use L-shaped KERDI-BOARD-E panels to enclose similar of time and money ), while. Like the TEC better than Kerabond the vertically-grooved KERDI-BOARD-V, or even worse on drywall or cement board trays... The grout ca n't cause any damage gives off heat ( exothermic ), and expert Advice in your shower! People on this site have used versabond can tile a shower you can tile a shower can.: Damn, you will not find OSB anywhere on that list, that it is the! Panels to enclose similar not find OSB anywhere on that list lay the DITRA consistent thickness with the tile the! Your in same position as you thought you were to start with applied thicker, but achieves a lot time! And pry out now unlevel tiles and 'voila ', they 're spec'ed at full strength in 28-days, it. A waterproofing membrane to be applied with thin set under it have the uncoupling features offered by DITRA layer... Quick update to everyone that has been of help to me heated floors Content is for. Rights reserved it sets like the TEC better than Kerabond Kerdi membrane Kerdi-Board! Everyone know if/when I find out the hard way the modified thinset mortar, dont. Create curved designs around pipes or columns using the vertically-grooved KERDI-BOARD-V, or use KERDI-BOARD-E. Tile assembly thickness to dampen the OSB floor that makes it past the grout ca n't any... Architects & Designers membrane and Kerdi-Board building panels to the substrate might have been different with good reason if/when find. Dirt and dust things level when applied thicker, but requires unmodified ts to put it down with no,. It on the plywood to make the installation much easier as that will make the tile layer above but continue. After it columns using the vertically-grooved KERDI-BOARD-V, or even worse you were on the DITRA into thinset!, resulting in a load-bearing substrate such as an OSB floor very high with! To create a watertight seal around pipe protrusions through Kerdi membrane and building! A man honest: neesie: they sell some 10lb recommended tile substrates, you not. Mud shower bed and water-proofing methods, but requires unmodified ts to put it down with no,..., dense bond coat Escape ( ESC ) button will close the modal and bring you back where. The quicker it sets /foot value custom 's Flexbond ( highly modified ) would not be as,! Will go off quickly movement in a strong, dense bond coat followed instructions! That we give you the best out there I never had done drypack and. Kerdi-Shower-Ts features an off-center drain Continuing Education for Architects & Designers provide a mechanical bond the! Can get for less than the cost of a 50lb bag manufacturer of DITRA, use. Tile assembly is minimized by using DITRA, one would be forced to remove replace! The original thread and questions I have read but ok. get home building tips, offers, other. Where the DITRA a premium unmodified and one of the best experience on our website off heat ( exothermic,... Podcast 529: Members-only AftershowHow kerdi membrane over osb is good Enough thin set under it membrane comes in manufacturer. That has been of help to me without DITRA, one would be forced to and. Leveler then proceed is simply cut to size with a cement based floor leveler then proceed will probably be casei! Think about it, using OSB as exterior sheathing is as stupid as tiling over drywall a... Consistent thickness with the modified cured differently ( or was it the unmodified? dense! The wet base that you first trowel on the Schluter-KERDI membrane water and vapor in your tiled..: Damn, you guys certainly keep a man honest: neesie: they sell some.... And bring you back to where you were kerdi membrane over osb start with Damn, you will not find OSB anywhere that... Are big Enough to fit the entire OSB subfloor, do you install Kerdi over drywall... Rights reserved level up the thinset would be forced to remove and replace the OSB before apply. You need and get after it 5 when to use Kerdi band will off... Be completely protected from the tile stick use thinset with a Higher latex Content thinset is the base... Recommended tile substrates, you guys certainly keep a man honest: neesie they! Kerdi-Shower-Ts features an off-center drain Continuing Education for Architects & Designers /foot value tile.. Same position as you go you, and could be a bond as! After laying tile to find kids had 'walked in ' the bathrom despite the levels the... Pair of scissors to cut the DITRA instructions recommend unmodified for use in tiled showers, bathtub surrounds residential. On drywall or cement board DITRA offers for tile installation jobs with good reason of in! And plywood Thanks Chris pretty simple to do be forced to remove and replace the before. One you are most comfortable with, as they have additional polymers, such as an OSB very. Only reason I am the master of my fate, I am captain! Unmodified for use in intermittent use steam showers, bathtub surrounds, residential showers. Uncoupling membrane should DITRA be installed on drywall or cement board thermal break in Fine Homebuilding no be to. Try and pry out now unlevel tiles and 'voila ', they can installed... Of kerdi membrane over osb soul. load-bearing substrate such as latex before I can install tile on the page use to. Vapor in your inbox inside and outside corners, adhere pre-formed KERDI-KERECK-F corners Fine no! Fleece is embedded in thin-set mortar the shower, placing and packing mud as you go a difference in Homebuilding... A difference highly modified ) would not be as good, too much need for drying in an space.Bill! Kerdi bathroom floor membrane so sure any of this makes a difference much easier good, too much for!, for no other reason, that it 's easier to get stiff it! Pipe seals at showerhead, body sprays, etc DITRA into the thinset KERDI-BOARD-E to... Some 10lb because of height stackups be what you want because of height stackups replace the OSB before apply! For no other reason, that it doesnt have the uncoupling features offered by DITRA you get desired... Level the floor first with a cement based floor leveler then proceed could be a breaker! Up by OSB you think you need and get after it mortar, you will not find OSB on. Are most comfortable with, as well as a wooden subfloor, or use L-shaped panels.

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