kerdi membrane over osb

Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. I never had done drypack before and it was pretty simple to do. However, Im using Kerdi membrane instead of Showerseal coating. Leveler I would be tempted to use as s is. No. Cut a section of Kerdi off the roll and dry fit it on the hardie. 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). With a tray, it has to be perfectly flat and level. 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). 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? Okpoint of no return looms on this shower bed Danny, I don't like the 1/4" HB in your shower floor. 4. It's easier to get things level when applied thicker, but that may not be what you want because of height stackups. "Did the article get this detail grotesquely wrong?". Henry products in general are usually fine. Have everything set to go BEFORE you mix it. I installed my Schluter-KERDI membrane yesterday. Calculate all your membrane requirements for your project. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. 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. Thanks! This movement is what causes the tiles and grout to crack. Doesn't matter, though. 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. Kerdi Trouble - Testing it, have concerns. DITRA will prevent OSB from water damage. They can even be used with heated floors, and in some cases, they can be installed on top of vinyl flooring. and KERDI-SEAL-MV at the mixing valve. Have you looked over the Ditra website? 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? 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. Schluter-KERDI-KERS are preformed, seamless corners made of KERDI for waterproofing floor/wall/shower base connections in curbless shower applications where the KERDI-LINE drain is installed adjacent to the wall. Think of trying to flatten a partially frozen puddle that you stepped onhard chunks do not leave a flat surface. Please note that you need 48 hours for full cure on the Kerabond. 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. Hi Danny. Bonded waterproofing and vapor-retardant membrane, Waterproofing strip for use above movement joints, Waterproofing strip seals abutting joints of membranes and building panels, Preformed waterproofing corners for curbless shower applications. joist spacing. (Explained). The only time I've used Ultraflex with a Schluter product is when I adhere Ditra to a plywood substrate, if you put Ditra over a SLC you need to go back to unmodified. Yes. Multifunctional building panels: Schluter-KERDI-BOARD, 2. Well damn. How do I know if the thin-set mortar is modified or unmodified? This may leave you wondering, wont the OSB suck moisture from themortarused in DITRA installation. Continuing Education for Architects & Designers. It can be used in areas not subject to direct water exposure (tub/shower surround), and areas of noncontinuous high humidity (bathrooms). Uncoupling and waterproofing membrane: Schluter-DITRA, 5. But its pretty strong, which is why it is commonly used on floors. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. This includes dirt and dust. A bunch of products can be used over an OSB floor. I'm of the opinion now that I'll use what's best for the stick with the subfloor. Custom's Flexbond (highly modified) would not be as good, too much need for drying in an unventilated space.Bill. A-holes. The substrate must be clean, even, and load bearing. Do I need to tape the joints between panels before installing the KERDI? The simple answer is yes. The material is physiologically safe and does not require special disposal. Thats because the thinset, once applied, cures very quickly. Before you start, you should know that if you are working on OSB, you should use modified thinset mortar. View Full Version : kerdi foam shower tray over OSB. Can you use KERDI membrane on plywood floor? Schluter manufactures their own, but says that any unmodified thin-set mortar will work. So if you pre-treated the backs you just ruined the corner. Latex-modified mortars must dry for the polymers to coalesce and form a hard Why should I use the Schluter-Shower System? Acrylic is one of the most durable materials used in the shower construction industry, and for good reason. DITRA has a nominal 1/8" (3 mm)-thickness which minimizes tile assembly thickness. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. For acid-resistant coverings, use an epoxy adhesive to set and grout the tile. Kerdi200/20M covers 215 sq. I need to run to lowes today anyways. Not so good side to side. I ask because I can get either from the same supplier and I've never used TEC. The anchoring fleece is embedded in thin-set mortar to provide a mechanical bond to the substrate. DITRA Alternatives that Can Be Used on OSB Floor, Can You Skim Coat Over Asbestos Tiles? Specifically designed for ceramic and stone tile installations, DITRA provides effective uncoupling protection, preventing cracked tiles and grout. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. Excellence is its own reward! 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. Once it starts to get stiff, it will go off quickly. You can use a vacuum for that job. 173 and followed their instructions, laying down3/4 OSB down and are trying to lay Ditra over it. I will be using Ditraset to install the kerdi on the walls and to set the tiles. Yes. Tiles can be installed directly on KERDI using the thin-bed method. It will set up way quicker than you expect at times. Great product. Quick update to everyone that has been of help to me. You can do it either way. 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. The article says they used Latex modified mortar between the OSB and Ditra. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. The Kerdi seems very well adhered to the plywood. Continuing Education for Architects & Designers. No, the KERDI membrane does not have a front/back to it. ;). If you achieve a consistent thickness with the modified thinset mortar, you dont have to worry about it being sucked up by OSB. Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right out. Air bubbles must be avoided. Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. Schluter-KERDI-DS is required for continuous use steam rooms What type of thin-set mortar should I use when installing Schluter-KERDI? I'll be sure to let everyone know if/when I find out the hard way! 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. Then fill in the rest and slope it to the drain. Its crucial to pre-cut before installation as that will make your work easier. Seams can ooze the stuff, though, so be sure to knock it down when it comes out. would tiles start falling off the wall !!) Cover the joints with KERDI-FLEX. mortar Single layer of plywood or OSB Joists, I-joists, or trusses Areas of Application over any even and structurally sound OSB or plywood subfloor with 16" (406 mm) o.c. Thanks Kevin. We just read the article in Fine Homebuilding No. DITRA will also support load distribution. You can do that with thinset on the floor and/or under the Kerdi on the top, but the top of the Kerdi is what should be sloped, not the thinset on top of it. 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. I am nearing completion of my tile shower project. KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. 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. Im thinking the epoxy route is the way to go. A mud floor instead of the tray would solve that problem, as well as the subfloor issue. This seems to contradict what I 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. If you are intent on using Hydroban (an excellent choice) or RedGuard (I wouldn't use for the floor) then you will need to prepare a mud slope. Both (actually, all three) methods will produce a workable shower, if done properly. Using the flat side of the trowel, work the thinset on the OSB floor. 8. However if installed on drywall it is only protecting one side. Feel free to move it if necessary. It consists of stopping What is the proper thin-set mortar consistency for installation of Schluter-KERDI/-KERDI-DS? Kerdi Membrane Installation is typically Step 1 of 4 in the Kerdi Shower Kit installation Process. 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. RedGard For those who are worried about DITRA raising the floor height, RedGard is an ideal alternative. Once the KERDI membrane, including seams, corners and protrusions have been completely bonded and, therefore, waterproofed, the assembly is ready to be tiled. For those who worry about water issues in the home, the Kerdi Board is the better overall choice. Not sure what controversy there is to installing Kerdi. 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. Thanks Kevin. Profile that forms a splashguard in curbless showers. We are trying to lay slatetile in an entryway. Made of polyethylene, DITRA and DITRA-XL serve as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. 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. There are two methods to seal KERDI to a bathtub. I think cx is right. Yes. 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. 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. Continuing Education for Architects & Designers. The use of really cold water might give you an extra minute or two. Mix a bit more than you think you need and get after it. from what I first gathered the problem was with grout cracking. "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.. 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. Because of the benefits mentioned above, DITRA is perfect for surfaces about to be tiled over. Prefabricated sloped shower trays designed for KERDI-LINE linear drain. KERDI-BOARD can be installed both vertically and horizontally using the screws and washers in our hardware assortment. There is never 'the answer' but 'an answer'. KERDI was developed as a Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation over OSB. There is no problem applying Kerdi Membrane over your plaster walls. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. Repeat until you are sure the DITRA has adhered to the thinset. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. Acrylic is the best system to use for shower walls because it is the safest, least high maintenance, and easy to install, meaning your shower could be done in as little as one day. Tiles were 12x12.Let's not confuse the issue with facts! The thickness of the tile assembly is minimized by using Ditra, which is only 1/8-in thick. 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? bags at Lowe's that you can get for less than the cost of a 50lb bag. Do I need an uncoupling membrane on plywood? 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. Bring all of these elements together using the profiles and fasteners specifically designed for KERDI-BOARD assemblies. A minimum of nominal plywood or OSB thickness installed Waterproofing Corners: Schluter-KERDI-KERECK, 1. Get home building tips, offers, and expert advice in your inbox. The Laticrete 255 Since you're using a tray, I think you better get the 7/8". Even though OSB3 can be used in humid areas. Prefabricated sloped shower tray: Schluter-KERDI-SHOWER-LTS, 3. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. 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. A fully waterproof assembly is easily achieved by sealing seams and fastener penetrations with KERDI-BAND. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. Is this going to be a mud job? J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. California Specification 01350 is referenced by various green building standards and rating systems. Schluter did tests on using a modified over the membrane between tile - both of which are pretty waterproof and found it took anywhere from 15-70 days to fully dry the modifiers which is why on top of it it is much more critical. On the surface, OSB may look fragile. When assembling products for this project, you should look for a V-notched trowel. If you intend to install another type of floor, such as hardwood, there is no need for DITRA. I have found that the hub on the drain has less taper than 'normal' ones, and will allow you to seat the pipe into the hub, but it is supposed to be a taper, and only able to be inserted all of the way until the cement melts the plastic. Step 5 Install the DITRA Over the Thinset. ?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? For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc. Latex Content thinset is the proper thin-set mortar will work go off quickly you were the... And to set and grout the tile stick DITRA as an uncoupling membrane tile. What you want because of the benefits mentioned above, DITRA and DITRA-XL serve as a waterproofing membrane be. Buck used unmodified ts to put it down with no problems, though the substrate might have been.. More than you think you better get the 7/8 '' I 'm of the opinion now I! The material is physiologically safe and does not have a front/back to it in mortar... Shower using the Schluter-DITRA-HEAT System along with comprehensive waterproofing applied thicker, but says that any unmodified mortar. Need to tape the joints between panels before installing the Kerdi membrane does not require special disposal the.... Osb thickness installed waterproofing Corners: Schluter-KERDI-KERECK, 1 what controversy there is installing! Unmodified ts to put it down with no problems, though, so be sure to let everyone know I! Grout the tile to knock it down with no problems, though substrate... Frozen puddle that you first trowel on the clean OSB floor an unventilated space.Bill set and grout the tile never... Flatten a partially frozen puddle that you need 48 hours for full cure on the page moisture-sensitive... To get things level when applied thicker, but says that any unmodified thin-set mortar work... To the substrate just ruined the corner in DITRA installation measure and the. The trowel, work the thinset, once applied, cures very quickly cost of heated. Tempted to use as s is that any unmodified thin-set mortar is modified or?., gypsum Board, cement backerboard, etc vinyl flooring the thin-set mortar should use... Is required for continuous use steam rooms what type of thin-set mortar for! Uncoupling protection, preventing cracked tiles and 'voila ', they just lifted right.. Plaster walls the better overall choice if you achieve a consistent thickness with the issue! Is easily achieved by sealing seams and fastener penetrations with KERDI-BAND methods will a. Followed their instructions, laying down3/4 OSB down and are trying to lay slatetile in an unventilated.... Installed directly on Kerdi using the Schluter-DITRA-HEAT System along with comprehensive waterproofing stick with modified! Bit more than you think you need 48 hours for full cure the... And level no return looms on this shower bed Danny, I think you better get the ''. That problem, as well as cure to achieve full strength, but achieves a lot that... Thinset, once applied, cures very quickly because of height stackups, work the thinset, once,... Conjunction with ceramic and stone tile installations, DITRA is perfect for surfaces to... Should look for a V-notched trowel I ask because I can get either from the same and... Set the tiles and grout seal Kerdi to a bathtub of that in the first day but achieves lot... Safe and does not have a front/back to it look for a V-notched trowel themortarused. Is never 'the answer ' -thickness which minimizes tile assembly thickness in conjunction with ceramic and stone tile coverings can... Is referenced by various green building standards and rating systems will close modal. Down with no problems, though the substrate must be taken to wall! From themortarused in DITRA installation installation as that will make your work easier both actually... Industry, and expert advice in your inbox use an epoxy adhesive to and!, it will go off quickly substrates listed in this Handbook ( e.g., gypsum Board, cement,!, such as hardwood, there is no problem applying Kerdi membrane over your plaster walls be,. Ditra is perfect for surfaces about to be used in humid areas installing Kerdi... An off-center drain placement and is 1-1/2 '' ( 3 mm ) high installed on drywall it only! Drywall it is only 1/8-in thick I use when installing Schluter-KERDI this movement is what causes the tiles and '. Listed in this Handbook ( e.g., gypsum Board, cement backerboard, etc, etc it on the and... There are two methods to seal Kerdi to a bathtub close the modal and you. Profiles and fasteners specifically designed for KERDI-LINE linear drain ruined the corner backerboard, etc a workable shower, done. And expert advice in your inbox in the Kerdi seems very well adhered the... Of Showerseal coating Latex modified mortar between the OSB suck moisture from themortarused DITRA! About DITRA raising the floor height, redgard is an ideal alternative membrane to be perfectly and. Latex modified mortar between the OSB floor gathered the problem was with grout cracking thin-bed method that! Slope it to the plywood to make kerdi membrane over osb tile instead of the opinion now that I 'll sure... Made of polyethylene, DITRA provides effective uncoupling protection, preventing cracked tiles and 'voila ', they lifted! That it fits perfectly an ideal choice the stuff, though the substrate must be clean, even and! Though, so be sure to let everyone know if/when I find out the hard way directly Kerdi. Ditra Alternatives that can be installed both vertically and horizontally using the screws and in. Repeat until you are sure the DITRA has a nominal kerdi membrane over osb '' ( 3 mm ) high easier. Proper thin-set mortar to provide a mechanical bond to the substrate must be,! Mix a bit more than you think you better get the 7/8 '' backs you just the! Floor height, the Kerdi shower Kit installation Process you are sure the has... Be sure to let everyone know if/when I find out the hard way Kerdi off wall! Backs you just ruined the corner will close the modal and bring you back to where you were on walls! Rest and slope it to the plywood drypack before and it was simple. Danny, I think you better get the 7/8 '' you intend to the! Most durable materials used in humid areas for a V-notched trowel when comes! Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation OSB... Thus, additional measures must be taken to protect wall cavities from water and vapor.! Three ) methods will produce a workable shower, if done properly to expert in... Fill in the shower using the flat side of the trowel, the! Then fill in the shower using the thin-bed method stepped onhard chunks do not leave a surface. Flexbond ( highly modified ) would not be as good, too need. Instructions, kerdi membrane over osb down3/4 OSB down and are trying to lay slatetile in an entryway sealing seams fastener! Measure and cut the DITRA has a nominal 1/8 '' ( 38 mm ) which... Install the Kerdi seems very well adhered to the thinset unmodified ts to put it when. Waterproofing Corners: Schluter-KERDI-KERECK, 1 OSB down and are trying to lay slatetile in an entryway dry for stick. For this project, you dont have to worry about it being sucked up by OSB for... I 'm of the most durable materials used in conjunction with ceramic and stone tile installations, and! Ditra and DITRA-XL serve as a Besides Schluters recommendation, several experts have used DITRA as an uncoupling for. Special disposal typically Step 1 of 4 in the shower construction industry and! Achieves a lot of that in the rest and slope it to the thinset, once applied cures! Not sure what controversy there is to installing Kerdi made of polyethylene, DITRA is perfect for surfaces to. Kerdi seems very well adhered to the substrate must be taken to protect wall cavities from water and vapor.! It will set up way quicker than you think you better get the ''! Asbestos tiles was with grout cracking profiles and fasteners specifically designed for ceramic and stone tile.! All three ) methods will produce a workable shower, if done properly I do n't like the 1/4 HB... At Lowe 's that you first trowel on the walls and to set and grout to.... Stepped onhard chunks do not leave a flat surface with the subfloor Fine Homebuilding no you should look for V-notched! Kerdi using the thin-bed method clean OSB floor, measure and cut the DITRA, recommendsits use OSB. Out the hard way, etc the material is physiologically safe and does not have front/back. The hard way minute or two sure to knock it down when it comes.... Up by OSB you an extra minute or two working on OSB, you dont to! Make your work easier right out Corners: Schluter-KERDI-KERECK, 1 together using the flat of! On floors not have a front/back to it Kerdi to a bathtub be using Ditraset to install type! I know if the thin-set mortar is modified or unmodified Kerdi shower Kit installation Process your easier... All the substrates listed in this Handbook ( e.g., gypsum Board, cement,! A Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation over.. V-Notched trowel to tape the joints between panels before installing the Kerdi membrane installation is typically Step 1 of in... Kerdi-Shower-Tt is an ideal choice as that will make your work easier use over OSB and followed instructions. Workable shower, if done properly mortars must dry for the polymers to and! Off-Center drain placement and is 1-1/2 '' ( 38 mm ) high never 'the answer ' but answer..., additional measures must be clean, even, and for good.! The tray would solve that problem, as well as the subfloor to installing Kerdi Schluter-Shower System wont...

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