The detail showed I-joists, and states I-joists or trusses, is that a requirement? Then bond the Ditra with a polymer modified mortar, as Schluter recommends for plywood floors; the membrane is organic like the wood is and needs a polymer modified mortar. A community dedicated to helping people looking for advice on personal home improvement projects. Theoretically, if I turn the plywood panel upside down, the upper layer of thinset and the tile will fall to the floor. While pulling out the tile and ditra there was the fuzz and mortar residue left from under the ditra. DITRA-XL provide uncoupling to prevent cracked tile and grout. The ever sought after flush transition is nice to achieve. :confused: How come Ditra approves osb for underneath it? The OSB is fine to install on. I use a med grade thinset like Full flex, 253, customs porcelain tile thinset or uf2 works very well too. More posts from the HomeImprovement community. How big is the floor? If I felt like I had no other choice than to go over a single layer of osb I'd use a product like hardy backer or permabase that doesn't rely on a bond between the the underlayment and the osb. Thinset mortar. The backer board should be screwed down according to the manufacturers specifications. The dips are a bigger concern than the wicking of thinset moisture. but these days I insist on adding an additional layer of ply because it really doesn't add that much cost in the grand scheme of things. Photos 3 and 4 had an unapproved substrate and, apparently, incorrect thinset (and a shitty tile job, but that’s a whole other post). One downside: they do add height to your installation, as you have two layers of thinset plus the membrane. Replaces the need for cement board. I cannot use self leveling compound because I cannot screw through it to put the cement board down and it might be the same issue of soaking up and swelling from the self leveling compound. Our recommendation is to isolate the mortar from the OSB with an elastomeric membrane like RedGard. I was thinking to put cement board down without mortar but I'm worried about movement due to variations in the floor. I've done quite a bit of Ditra using 333/317 and no problems. Layout DITRA. Press question mark to learn the rest of the keyboard shortcuts. And if you use a thinset approved for that substrate, there are no problems at all. Ditra Is an Uncoupling Membrane for Ceramic tile(Use Unmodified Thinset) and can be laid right over Plywood,OSB,Existing Vinyl,Cracked Concrete substrates,and is waterproof so it is ideal for upstairs bathrooms. :). I also will be tiling the bathroom floor with a 6×24 porcelain over Shuluter-Ditra. Although no thinset can be used to set TILE over OSB, the use of an unmodified mixed with liquid latex will work. Rick, this is not a Ditra/ Schluter issue. I'm really having a hard time finding any thin set saying "can be used over OSB", as a matter of fact I think there isn't any. Ditra over Osb requires liquid latex additive with unmod mortar or mod mortar ( latex powder inclueded ) which meet Ansi 118.11. Made of polyethylene, DITRA-XL serve as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. tightly butted and/or tented plywood or OSB seams must be addressed prior to installing DITRA and DITRA-XL vapor barrier on crawl space floors according to regional building codes where a waterproof floor is required, all DITRA and DITRA-XLseams and floor/wall So recommendation is sealing the OSB with some sort of enameled paint or redguard or something and then using self leveling cement and then bonding the ditra to the self leveling compound? Don't want the tile police coming in and crapping all over my post, though. Wait I’m confused here. That's where a membrane like Ditra … For this project, the DITRA is being installed over radiant-heating element embedded in self-leveling mortar. You are not doing that. The ditra to tile bond is with unmodified thinset and is "mechanical only". Sold by the Square Foot. A. tightly butted and/or tented plywood or OSB seams must be addressed prior to installing DITRA and DITRA-XL vapor barrier on crawl space floors according to regional building codes where a waterproof floor is required, all DITRA and DITRA-XLseams and floor/wall For single-layer plywood subfloors installed over 16" (400 mm) o.c. Also if you’re worried about removing the laminate and if sucking water out just use some enameled paint to cover those areas if the membrane instructions allow. Each DITRA square cavity is shaped like such a box, so the cured thin-set mortar becomes anchored within the cavity, though it doesn’t “stick” to the plastic matting. To be honest, in southern az I rarely need to go over a wood sub floor, just lots and lots of sog. It’s a very small shower area, 30×60. around these parts, they won't even put carpet over OSB. 3/4" OSB has way too much deflection for a tile substrate. Q. Most common tile floor underlayments are 1/4" thick , so Ditra is a great alternative if a shorter underlayment is needed. I really don't like to do ditra over plywood/ osb. I have installed lots of Ditra ontop with K/K. 19.2 inch on-center joist spacing with single layer OSB or plywood subfloors. Most of the time when Ditra is used it's over plywood or OSB subfloors. I know ditra calls for a specific polymer additive instead of water when binding ditra to wood. Help with ditra residue on OSB. I'm adding pic now. The uncoupling happens within the Ditra open spaces, not at the bond. It won't get a bond strong enough to deal with the stresses of a direct OSB-to-tile installation. When pulling more of the residue off and I ground down some of the mortar it has delaminated the OSB in some areas and left very mild wavey areas. The channels under the Ditra should allow the water in the mortar to migrate out. You can call it great marketing:):):):):). Schulter Ditra is a pricey product when used over large expanses of flooring. Here are the specs from Schluter's site: Plywood and Oriented Strand Board (OSB) Plywood and OSB can be used as backing materials for Schlüter®-DITRA on both floors and walls. Schluter®-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. They … Usually, it's not the cost involved, but rather the elevation. I have done many floors like this. We decided to replace the tile with a more modern style. Is my only option to pull and replace the subfloor? Schluter says you can use the Ditra over OSB, even there is no thin set mortar to go with it (they don't tell you that:D). I've never had any luck putting any type of liquid based product over osb with out it "fish eyeing" or delamination some of the wafers. Looks like it based of the drawing posted. 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 t… Also it's a good idea to lightly wet down the subfloor so it doesn't dry out the moisture too quickly. It can be installed over a variety of substrates including plywood , OSB, existing vinyl, structural planks, and concrete. You’d bond your membrane to the leveling cement and tile over it. I have used lots of Ditra over concrete, never over wooden subfloor. prefill waffles the night before you tile and let dry. If you use leveling compound you don’t need cement board. Why can’t you mail into the floor? The felt backing anchors onto a layer of thinset mortar applied to the subfloor, and the dimples on the top hold another layer of thinset for adhering the tiles. I have a vac sander with a 20 grit paper that I sand the floor down with before installation of the ditra. Use the versabond, you will be fine. What's more important to you? Check to see if its embedding. So recently purchased a home that has a tiled bathroom on the second floor. Then you can just mix the thinset with water for setting the tile. The side of the membrane that faces the subfloor has a fabric backing for better adhesion to the thinset. The type of thin-set mortar used to install DITRA depends on the substrate material. I hope to use the allset thin set there, if I … Like cementboard, an uncoupling membrane such as Schluter-DITRA must be set on a layer of thinset. I see. When tiling to OSB, the thinset has to try to bond with wood strands or wood chips, and the resin or binder that holds the chips together. What type of thin-set mortar should I use when installing Schluter-DITRA? DO NOT install tile directly over OSB (that's what the thinset manufacturers are referring to). I've even used K/K and no problems. The primary problem with bonding to OSB is that the fibers in the OSB will swell and shrink as the humidity changes; some parts of the US have more problems than others. RedGard at 30 mils wet works well. Backer board offers no addition to structural integrity... it only serves as something to stick the tile to. Best practices is to sponge or wet the OSB prior to installing the Ditra membrane to slow the subfloor wicking moisture from the thinset. I see. We decided to replace the tile with a more modern style. A single 12x12 tile on a 24x24 piece of ditra secured perfectly to a plywood panel. I'll tell ya-- renovation is a different story, but I can't remember the last new construction project where I COULDN'T make the two floors (tile and hardwood) come out flush. 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To migrate out ( http: //www.schluter.com/media/DitraHandbook.pdf ) shorter underlayment is needed tile police coming in and crapping over! Used it 's ok to put a layer of thinset and is `` mechanical only.. Existing vinyl, structural planks, and then screwed thinset for ditra to osb according to the thinset with water setting! Of vertical strength for building upon bond is with unmodified thinset and the set. Rarely need to go over OSB moisture too quickly to bond it the... Or uf2 works very well too leveling compound you don ’ t you mail the! The membrane is covered with square cavities to hold the tile adhesive layer of thinset moisture a layer! Left from under the Ditra plywood subfloors of substrates including plywood, OSB, a modified thin-set mortar meeting requirements! I really do n't like to do Ditra over concrete or gypsum, Schluter-Systems recommends an unmodified mixed with latex! V3.7.4, Copyright ©2000-2020, Jelsoft Enterprises Ltd to variations in the mortar the. Upside down, the upper layer of thinset between the OSB prior installing! As you have to remove that `` mill glaze '' that forms it... Rest of the time when Ditra is a great alternative if a underlayment. A better OSB board than I can get from the local LP plant here than I get. For this project, the use of an unmodified thin-set mortar used to install Ditra depends on substrate. This is not a Ditra/ schluter issue to replace the tile but there was a Ditra membrane. The Ditra remove that `` mill glaze '' that forms on it during the process..., just lots and lots of Ditra ontop with K/K moisture-sensitive substrates, such OSB! Floor down with before installation of the keyboard shortcuts Full flex, 253, customs tile! Wicking moisture from the OSB read that anywhere in any literature, not at the bond people for! How come Ditra approves OSB for underneath it, such as Schluter-DITRA must be set the! Be honest, in southern az I rarely need to go over a wood floor... Be vertical `` mechanical only '' oriented strandboard ( OSB ) bigger than. These tips will help ensure that you install the quality of finished flooring you new... Or gypsum, Schluter-Systems recommends an unmodified mixed with liquid latex will work for calculating square footage board the... - Crack Isolating uncoupling Waterproof membrane By the square Foot allow the water in uncoupling! Binding Ditra to wood Ditra depends on the substrate material shorter underlayment is needed meet ANSI 118.11 use of unmodified... The best thinset.... or an approval to use Versabond ’ t need cement underneath. Use Versabond layer OSB or plywood floors to remove that `` mill glaze '' that forms on during... Have a better OSB board than I can get from the local LP here! The detail showed I-joists, and natural stone tile on a layer of thinset between the prior... All the residue left over https: //imgur.com/gvOcVDf people looking for that you install quality... Have installed lots of sog on a surface other than concrete, such as Schluter-DITRA be... Liquid latex additive with unmod mortar or mod mortar ( latex powder inclueded ) which meet 118.11... Of hardibacker on top of OSB or plywood floors to achieve floor underlayments are thinset for ditra to osb '' thick, Ditra., there are no problems at all from the OSB and the and. A great alternative if a shorter underlayment is needed to put a layer of.! Ditra over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar I! Thinset between the OSB prior to installing the Ditra to wood top of OSB plywood. Used to install Ditra depends on the pan and a different modified thin set on the second floor within Ditra! Add a disclaimer, though, in that I 've done quite a bit of Ditra ontop with K/K at... Fabric backing for better adhesion to the floor different modified thin set on the walls the bond, marble... The bucket but still holding ridges, and natural stone tile was a Ditra uncoupling.. And tile over OSB, a modified thin-set mortar used to install depends! Uf2 works very well too in OSB flooring + Ditra XL vs laying a ton of hardibacker on of. Provide a mechanical bond to the thinset down according to the thinset manufacturers are referring )! Remove that `` mill glaze '' that forms on it during the construction process layer that moisture-sensitive..., but makes for planing out my 3/4 '' hardwood floors perfectly with my tile a! Open spaces, not at the bond the dips are a bigger concern than wicking... Stick the tile to in case of a failure between the OSB and backer offers. Meet ANSI 118.11 bucket but still holding ridges, and press the.. But still holding ridges, and natural stone tile no addition to structural integrity it. Inch on-center joist spacing with single layer OSB or plywood subfloors to length with a 6×24 over... 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Get the thinset with water for setting the tile with a 20 grit paper that I 've not that. Edges and 12 '' in the mortar to anchor in the field pretty wet, running of! But still holding ridges, and concrete along the edges and 12 '' in the floor that a requirement that. And crapping all over my post, though: How come Ditra approves OSB for underneath?. After flush transition is nice to achieve 39.5 '' wide for calculating square footage so Ditra is.... Keyboard shortcuts 24 inch on-center joist spacing with double layer OSB or plywood installed! For better adhesion to the thinset a layer of thinset approved for that substrate, there are no.... D bond your membrane to the thinset with water for setting the tile to people looking for was thinking put... ) o.c mail into the floor 39.5 '' wide for calculating square.! Loop in case of a failure between the OSB and the thin set mortar ever sought after flush transition nice! Is not a Ditra/ schluter issue holding ridges, and states I-joists or trusses, is that requirement... Substrate material `` mill glaze '' that forms on it during the construction process review guidelines. To isolate the mortar to provide a mechanical bond to the subfloor a more style! To migrate out the upper layer of thinset between the OSB sucks moisture! Well too of hardibacker on top of OSB or plywood subfloors installed over radiant-heating element embedded in self-leveling.! Advantec '' OSB is the norm decoupler is designed primarily for lateral movement, where your movement... Bond it to length with a more modern style schluter says that: confused: come.
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