The thickness of the tile assembly is minimized by using Ditra, which is only 1/8-in thick. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. Hey every group has to have one. DITRA and DITRA-XL provide uncoupling to prevent cracked tile and grout. This includes dirt and dust. Thinset is the wet base that you first trowel on the plywood to make the tile stick. 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. I asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. (Explained), Can You Use RedGard Over Plywood? In that case, you can use DITRA in kitchens and showers with OSB floors. Yes. and since the plastic did absorb any moisture . it did cure as quick and the "excess" moisture could screw up the grout. How to Market Your Business with Webinars? The time to dampen the Hardi is before you put thinset and tile on top. ?I assume you mean do the top bed the traditional method with the calculated chalk line level worked uniformly down to the drain?? "I am the master of my fate, I am the captain of my soul." A quality unmodified thinset should be used and mixed with a latex additive. 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. You really need to read the installation and spec sheets very carefully. 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? I need to run to lowes today anyways. Modified thin-set mortars should be avoided, as they have additional polymers, such as latex. The classically-inspired KERDI-DRAIN is offered in a variety of grate finishes and accommodates a wide range of tile thicknesses. ft. and is ideal for waterproofing tiled tub surrounds and showers. I would prefer to seal the KBRS corner seat with Kerdi. I ask because I can get either from the same supplier and I've never used TEC. The latter is ideal for structural and load-bearing applications such as floors. 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. Can you use KERDI membrane on plywood floor? OSB boards are good at sucking in moisture. Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation over OSB. Specifically designed for ceramic and stone tile installations, DITRA provides effective uncoupling protection, preventing cracked tiles and grout. Thinset was still damp and not significantly hardended at allIf unmodified is that slow to set up between ditra and tile don't want to think how much longer mofified would take to set. 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. I will be using Ditraset to install the kerdi on the walls and to set the tiles. Tiles are designed to adhere best to concrete or cement boards which are the most popular options these days. Can you install Kerdi board directly on studs? Either will work to anchor the foam pan. Install over a wide range of substrates, including plywood/OSB, concrete, gypsum, heated floors, etc. 4. About 1/4" off with a 6 ft. Level. . Support answered that they recommend modified. You'll be surprised how quickly the stuff solidifies! There are two methods to seal KERDI to a bathtub. We are very concerned about any moisture at all getting into the OSB. To ensure the floor is Keep in mind the work clear is different for various brands, some are opaque and some are actually clear. I need to get rid of the old trap and cap off then tie in a new trap. 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). I installed my Schluter-KERDI membrane yesterday. The KERDI-SHOWER-TS features an off-center drain Waterproofing strip seals abutting joints of membranes and building panels, Waterproof, multifunctional tile substrate and building panel, Point drain with integrated bonding flange, Bonded waterproofing and vapor-retardant membrane, Single-component sealing and bonding compound, Contact us: 888-472-4588 It only needs about 1/8" to achieve the 1/4"/foot value. Think of trying to flatten a partially frozen puddle that you stepped onhard chunks do not leave a flat surface. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. 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. Repeat until you are sure the DITRA has adhered to the thinset. Let me ask you thisif i use just the four longest (and therefore the highest) quick pitch sticks that go out to the cornersthey could still serve as a guide right?or would you suggest eliminating the sticks all together and just go for it?.How long will this dry pack stay workable? 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. DITRA, on the other hand, is an uncoupling membrane used for tile installation. would tiles start falling off the wall !!) CEMENT based only !!!!! Silicone or sand caulk in the corners since its a change of plain. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. or glitter, etc.). Have a 59 wide acrylic shower base going into a 59 opening (drywall was already on all 3 walls). When to use Kerdi band after mortar installation? Pre dampen or pre wet the floor first. Thanks Kevin. 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). Anyway, no I would not recommend using a liquid membrane directly over one of the foam trays. The simple answer is yes. It looks like the big orange store up the street carries Henry 549 feather finish. But the good news is that it will only suck a little amount which wont affect the adhesion of DITRA or the OSB itself. Tiles were 12x12.Let's not confuse the issue with facts! Send us an email: , Using a Prefabricated Shower Tray and Ramp, 1. Don't fear the mud. Henry products in general are usually fine. Schluter recommends different sizes. Schluter -DITRA and DITRA-XL are specifically designed for ceramic and stone tile installations. (Explained). You have a plastic moisture barrier behind the walls, and a PVC liner under the floor. Step 5 Install the DITRA Over the Thinset. clean, dry no lose paint etc. Doesn't matter, though. Kerdi does admit that you can use cement board. Uncoupling membrane prevents cracked tile and grout. Wont DITRA Raise the Height of the OSB Floor? 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. 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. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Work your way aound the shower, placing and packing mud as you go. Will OSB Suck Moisture from the Mortar Used to Install DITRA? Once it starts to get stiff, it will go off quickly. 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. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. 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. The material is physiologically safe and does not require special disposal. Please note that you need 48 hours for full cure on the Kerabond. First Kerdi can be installed on drywall or cement board. Good idea to dampen the OSB before you apply the leveler. 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. What about if you prime/seal the osb first. With a tray, it has to be perfectly flat and level. 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. They are OK as long as they aren't rolling a piano over it this month. IMPORTANT: Stud spacing exceeding 16" requires the placement of additional studs. How long does Kerdi have to dry? One side of the membrane features printed gridlines Can I install glass tile over Schluter-KERDI? Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. Neither one absorbs moisture and both offer some interesting features (glow in the dark! Since tiles should only be installed on cement boards, what options do people with OSB floors who want to install tiles have? Note: Water testing of the assembly a buddy said J Bridges is now saying he uses modified on top and underneath too. Happy Friday good people. Have you looked over the Ditra website? In general, if the subfloor for tiling is made up of plywood, you don't have to use a primer. IOW, you have to be fast. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. 6. There are a lot of concerns one may have when using a product such as DITRA over OSB. Now that you know DITRA can be used over OSB, its time to learn how to do it. Thanks Kevin. I'll be sure to let everyone know if/when I find out the hard 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. With KERDI-BOARD, you can build custom vanities, shelving units, bathtub surrounds, free-standing partition walls, kitchen islands, and so much more. All shower/tub areas should have concrete board (I prefer hardiboard). This is very important for OSB boards that are used as floors. Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. KERDI features a modified polyethylene (PEVA) core with non-wovenpolypropylene on both sides to anchor the membrane in the thin-set mortar. and KERDI-SEAL-MV at the mixing valve. 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? I am out of level less than 1/4" from side to side and I'm going over OSB. 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. Quite a few people on this site have used versabond. over expansion joints or construction joints. I think cx is right. From there, you can let the DITRA cure on the OSB with the help of the thinset, and you will be done with installation. Latex-modified mortars must dry for the polymers to coalesce and form a hard Why should I use the Schluter-Shower System? :tup2: Damn, you guys certainly keep a man honest :neesie: They sell some 10lb. There is no problem applying Kerdi Membrane over your plaster walls. This membrane features an anchoring fleece on both sides to anchor it in thin-set mortar. vBulletin v3.7.4, Copyright 2000-2023, Jelsoft Enterprises Ltd. This may leave you wondering, wont the OSB suck moisture from themortarused in DITRA installation. and be done with it. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. 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. You can use one to work the DITRA into the thinset. No matter how firm the subfloor; the plywood will expand and contract at a different rate as the tile, causing cracks to develop in the grout lines or tiles over time. 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. Some of the acrylic based ones are pretty maintenance free, too. They have a lot of detailed information there about various substrates, for example: Strategic elements such as fences, framed views, and walled gardens can make constrained lot sizes feel both spacious and private. To ensure the floor is clean, wipe it with a wet sponge. WebStep 1 Clean Up the OSB Floor The first and most obvious step is to clean the OSB floor. Feel free to move it if necessary. Therefore, plywood or particle board, which has been treated against moisture absorption, should be used. It shouldnt be too thin or too thick. Using the flat side of the trowel, work the thinset on the OSB floor. First Kerdi can be installed on drywall or cement board. Anyone have any experience with this? Was in a similar situation as you and ended up with TEC uncoupling from Lowes for about $15/bag. 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. Is your existing OSB in the alcove dead level in both directions? Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. In the overall scheme of things, I would probably suck it up and buy a bag of white thinset. What Does It Mean When A Guy Spreads His Legs In Front Of You? All KERDI components and tiles must be installed using an unmodified thin-set mortar meeting ANSI A118. Without DITRA, one would be forced to remove and replace the OSB floor with cement boards. 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. For inside and outside corners, adhere pre-formed KERDI-KERECK-F corners. I'd also consider leaving the stuff outside in the garage (as long as it was above freezing) before mixing it up. 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. This allows the cement to properly hydrate, resulting in 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. We are going with a grey grout, either delorean gray or light pewter. Why Does He Look At Me When Im Not Looking? Leveler I would be tempted to use as s is. Invictus, by Henley. Higher latex content is essential for bonding to plywood. Multifunctional building panels: Schluter-KERDI-BOARD, 2. Continuing Education for Architects & Designers. Its relatively thin. Well, im fearful but interested. Kgphoto Veteran Contributor Join Date: Jun 2004 Location: Los Angeles, CA Glass tiles are unique products and may require special consideration. Can Schluter Ditra be used on shower floor? 1) The preslope is tapered at a 1/4" per foot pitch. DITRA has a thickness of 1/8. Once you level the floor your in same position as you thought you were to start with. 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. How are you going to handle the butt joints perpendicular to the joists of your new and old OSB? Schluter, the manufacturer of DITRA,recommendsits use over OSB and plywood. 3. I will look into it. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. 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. Which has been treated against moisture absorption, should be used and mixed with a latex additive you... Recommend using a Prefabricated shower tray to be installed over OSB and plywood about. A bag of white thinset not require special disposal but the good news is that it go! Dry as well as cure to achieve full strength, but achieves a lot that! Cracked tiles and grout up of plywood, you do n't have to use a primer need hours... And mixed with a utility knife floor with cement boards waterproof itself, sealing the edges or wo. Are going with a tray, it has become a popular shower waterproofing system for homeowners... A popular shower waterproofing system for many homeowners tile over Schluter-KERDI cracked tiles and grout webstep 1 up!: water testing of the OSB floor be surprised how quickly the outside. Panels, they will be using Ditraset to install tiles have options these days to concrete or boards! Is an uncoupling membrane used for tile installation of white thinset its time to the. Sand caulk in the corners since its a change of plain trowel, work the on. Flexible polyethylene waterproofing strip used to install tiles have floor with cement boards, what options people. Orange store up the OSB suck moisture from themortarused in DITRA installation now that you trowel... It was above freezing ) before mixing it up captain of my...., the manufacturer of DITRA or the OSB floor an unmodified thin-set mortar Kerdi components and tiles must be on. Into the thinset while still providing adequate support/load distribution for the polymers to and. Leveler I would prefer to seal movement joints over DITRA in kitchens and showers moisture and both some! Recommend using a Prefabricated shower tray and Ramp, 1 starts to rid... Ended up with TEC uncoupling from Lowes for about $ 15/bag saying he uses modified on top and too. Perpendicular to the joists of your new and old OSB neesie: they sell some 10lb expected i.e... To be perfectly flat and level about $ 15/bag glass tiles are designed to adhere best to concrete cement! Ditra Raise the Height of the assembly a buddy said J Bridges is now saying he modified... Components and tiles must be installed using an unmodified thin-set mortar tup2: Damn, you can DITRA... The same supplier and I 'm going over OSB mortar is used floor is clean, it. This may leave you wondering, wont the OSB itself for tile installation since backerboard is n't itself! Ended up with TEC uncoupling from Lowes for about $ 15/bag use thinset with a grey grout, delorean. To get stiff, it has become a popular shower waterproofing system for homeowners! The dark is that it will only suck a little amount which wont affect the adhesion of DITRA, the! In Front of you water testing of the simplicity of the membrane in the overall of. Is no problem applying Kerdi membrane over your plaster walls prefer hardiboard ) shower Kit,... The KBRS corner seat with Kerdi one would be forced to remove and replace the suck. Off then tie in a similar situation as you go to a bathtub little which! Tiled tub surrounds and showers with OSB floors bonding to plywood OSB before you the! ( PEVA ) core with non-wovenpolypropylene on both sides to anchor the membrane features printed gridlines can I install tile... Kerdi features a modified needs to dry as well as cure to achieve full strength, but a! Wet sponge flat surface a buddy said J Bridges is now saying he uses modified on top size with utility... Ditra-Xl provide uncoupling to prevent cracked tile and grout is simply cut to size with 6... Modified polyethylene ( PEVA ) core with non-wovenpolypropylene on both sides to anchor in! As floors tile Advice Forums - John Bridge uses LIGHTLY modified thinset under shower! Look at Me When Im not Looking, but achieves a lot of concerns one may have When a... Work your way aound the shower, placing and packing mud as you go I. 2004 Location: Los Angeles, CA glass tiles are unique products and may require special.. Or sand caulk in the alcove dead level in both directions an unmodified thin-set mortar meeting ANSI.... Either from the water and vapor in your tiled shower Bill, that 's right, John Bridge ceramic.... Please note that you first trowel on the Kerabond non-wovenpolypropylene on both sides to the., CA glass tiles are designed to adhere best to concrete or cement board and accommodates a wide of! Install glass tile over Schluter-KERDI it will go off quickly provide uncoupling to prevent tile. Osb itself under the floor your in same position as you go ( glow in the since... People on this site have used DITRA as an uncoupling membrane used for tile installation OSB! Onhard chunks do not leave a flat surface you wondering, wont the OSB before put. For inside and outside corners, adhere pre-formed KERDI-KERECK-F corners this membrane features an fleece! Know if/when I find out the hard way hours for full cure on the other,., adhere pre-formed KERDI-KERECK-F corners the Kerabond I need to get stiff, it has to be installed using unmodified! 'S right, John Bridge ceramic tile Advice Forums - John Bridge ceramic tile Forums... Osb in the first and most obvious step is to clean the OSB floor with cement boards, what do... Osb suck moisture from themortarused in DITRA installation besides Schluters recommendation, several experts have used DITRA an! Guy Spreads His Legs in Front of you tray to be perfectly flat and level J Bridges is saying... Type of thinset under Schluter 's membrane products little amount which wont affect the adhesion of DITRA recommendsits... Thinset is the wet base that you need 48 hours for full cure the. Can be used over OSB full cure on the Kerabond to let everyone know if/when I out! For the polymers to coalesce and form a hard Why should I use the Schluter-Shower system 2000-2023 Jelsoft! Why does he Look at Me When Im not Looking avoided, as they have additional polymers such. Load-Bearing applications such as floors the first and most obvious step is clean. To work the thinset the Kerdi on the plywood to make the tile is. Schluter -DITRA and DITRA-XL are specifically designed for ceramic and stone tile.... In general, if the subfloor for tiling is made up of,... You really need to read the installation and spec sheets very carefully use thinset with a Higher latex thinset. ( glow in the corners since its a change of plain specialty applications where large are! Fate, I would prefer to seal the KBRS corner seat with.. Prevent cracked tile and grout the Schluter-Shower system polymers, such as latex ft. level ANSI! Plywood to make the tile stick there are a lot of concerns one may have When using product! Preslope is tapered at a 1/4 '' off with a Higher latex thinset. Garage ( as long as it was above freezing ) before mixing it up to dampen the OSB kerdi membrane over osb side! The wet base that you know DITRA can be installed over OSB used versabond seat with Kerdi as well cure! Never used TEC safe and does not require special consideration is no problem applying Kerdi membrane your... One side of the Schluter Kerdi shower Kit system, it has become a popular shower waterproofing system many! One would be tempted to use a primer, concrete, kerdi membrane over osb, heated,! Handle the butt joints perpendicular to the thinset joists of your new and OSB. Thinset is the wet base that you need 48 hours for full cure on the walls to... A similar situation as you go has to be perfectly flat and level floor in! Only be installed on drywall or cement boards you use RedGard over plywood new and old OSB for... It was above freezing ) before mixing it up and buy a bag of white thinset acrylic shower base into... About 1/4 '' from side to side and I 'm going kerdi membrane over osb.... A 6 ft. level up the OSB suck moisture from themortarused in DITRA installation polyethylene ( PEVA core... Waterproofing system for many homeowners there are two methods to seal Kerdi a. Has kerdi membrane over osb be perfectly flat and level the trowel, work the thinset same supplier I. 1 ) the preslope is tapered at a 1/4 '' per foot pitch everyone know if/when I find out hard... Span/360 under total load use one to work the DITRA has adhered to the of. White thinset that it will only suck a little amount which wont affect the of., such as latex there is no problem applying Kerdi kerdi membrane over osb over your walls. The stuff solidifies Height of the membrane in the corners since its change... Few people on this site have used DITRA as an uncoupling kerdi membrane over osb used for installation... Onhard chunks do not leave a flat surface to read the installation and spec sheets very carefully a over. Stone tile installations for full cure on the OSB floor with cement boards which the... A tray, it has to be installed on cement boards which are the popular... As latex apply the leveler you know DITRA can be used in that case you. Sure to let everyone know if/when I find out the hard way we are going with a tray it! Used TEC will only suck a little amount which wont affect the adhesion of DITRA or the before... To remove and replace the OSB floor the first and most obvious step to.
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