Then fill in the rest and slope it to the drain. That would be ideal for me right now. Uncoupling membrane prevents cracked tile and grout. First Kerdi can be installed on drywall or cement board. 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. Can you tile over Kerdi membrane? In general, if the subfloor for tiling is made up of plywood, you don't have to use a primer. The thin-set mortar used for bonding KERDI must be appropriate for the substrate, and it must penetrate and engage the KERDI fleece. Now that you know DITRA can be used over OSB, its time to learn how to do it. The plan is to redguard over all of it. What about if you prime/seal the osb first. A 1/4" x 3/16" (6 mm x 5 mm) V-notched trowel or the Schluter-KERDI-TROWEL is recommended.. How do I seal Schluter-KERDI to a bathtub? Continuing Education for Architects & Designers. 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. Not so good side to side. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. I knew better than to start another thread! Thinset is the wet base that you first trowel on the plywood to make the tile stick. 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. 3 Can I use unmodified thinset on plywood? I am using Laticrete Roll on liquid membrane on all the seams and the curb and all around the windowwasnt planning on doing the floor since I'll have the lineror did you mean a liquis membrane on the pre pitch bed as a backup the main liner? And if you have some low spots after you are done you can always adjust with some thinset. What material is used behind shower walls? I installed my Schluter-KERDI membrane yesterday. Keep in mind he will apply thin-set and his Kerdi shower tray over the leveler. 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 Almost like a hydraulic cement. If it will, that can complicate issues such as opening doors. Yes,Kerdi can be installed on drywall or cement board. The divot method is a hybrid between the usual method of applying the membrane to the preslope and another method of applying the membrane to the setting bed (top mud bed). To build a shower properly, you first install cement board and then go over that with a Kerdi membrane to waterproof it before tiling. Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. JLC Online: Best practices for professional builders and remodelers. The article says they used Latex modified mortar between the OSB and Ditra. Not sure what controversy there is to installing Kerdi. Mark the coverage of the Kerdi on the hardieboard. Cut a section of Kerdi off the roll and dry fit it on the hardie. So, heres my dilemma. Support answered that they recommend modified. A quick answer to the above question is that DITRA can be installed over the OSB floor. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. Thanks Kevin. In fact, it's advised to use this product on drywall in your bathroom before laying tile and other materials. Working with Schluter Kerdi Fix is easy as it is odourless and skins over after 10 minutes, curing fully over 24 hours per 3mm applied. Kerdi Board is another choice with a decently long history and loyal customer base. 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. Kerdi Membrane Installation is typically Step 1 of 4 in the Kerdi Shower Kit installation Process. Kerdi does admit that you can use cement board. Its a water-resistant membrane used for tiles and paver coverings. On the surface, OSB may look fragile. I think cx is right. Since KERDI is impervious, it does not deprive the mortar of its moisture. It takes a little longer than the traditional mud shower bed and water-proofing methods, but it is worth it. Go with a masonry bench or look into the better bench or nobel bench. Thanks Kevin. 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. 173 and followed their instructions, laying down 3/4 OSB down and You really need to read the installation and spec sheets very carefully. If you continue to use this site we will assume that you are happy with it. Technically, they're spec'ed at full strength in 28-days, but actually continue to get stronger after that as well. This seems to contradict what I It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. Thanks Robert. DITRA has a thickness of 1/8. Work your way aound the shower, placing and packing mud as you go. After a quick check with local suppliers, I do have the Mapei uncoupling mortar available to me. I think I'd get it well dampened before covering with the deckmud and maybe painting a slurry of cement or some thinset to help bond things. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. 1 Can you put Kerdi membrane over plywood? No wait time is required. You can slightly lift one of the edges to check on the progress. However, we just found out from the Tile Council of America that OSB doesnt bond well to thinset???? Do I need an uncoupling membrane on plywood? I managed, with the help of this fine forum, to put in a custom shower with both kerdi and a mud bed. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Note: Water testing of the assembly You do want to ensure that the riser pipe is as close to plumb as you can get, and block the bottom of the trap so that it won't move. If you can tile a shower you can do a mud bed. Great product. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. KERDI-BOARD can be mounted vertically or horizontally on wood framing with the KERDI-BOARD screw and washer hardware set. The KERDI-SHOWER-T is offered in five sizes with perimeter heights ranging from 1-3/32" (28 mm) to 1-1/4" (32 mm). Schluter -DITRA and DITRA-XL are specifically designed for ceramic and stone tile installations. Schluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. When you stop and think about it, using OSB as exterior sheathing is as stupid as tiling over drywall in a shower. 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? Some suggest marble is not recommended for showers. I used Kerdi and I followed the Bathtub surround instructions with Kerdi band on the bottom and Kerdi fix to attach it to the shower base. IOW, you have to be fast. Tiles are designed to adhere best to concrete or cement boards which are the most popular options these days. Schluter-KERDI-BAND is a waterproofing strip used to seal butt joints and floor/wall connections with KERDI and DITRA membranes and KERDI-BOARD building panels. After the mud screed is set, fill the area between the mud screen and the drain fitting with mud, again slightly higher than needed, then use more straight edged boards to pack the mud down in a straight line beteen the mud screed and the drain. I will heed that advice. To ensure the floor is clean, wipe it with a wet sponge. WebWhat Mortar for Schluter Kerdi & Ditra Nathan Wallace 7 years ago I am getting ready to install 12x24 tile in my shower and floor and going to be using the Kerdi membrane over 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. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. Continuing Education for Architects & Designers. Schluter-KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. Do I need to start over or can I simply repair the hole? I will give it a shot. How Do I Get Rid Of Green Mold In My Lawn? And, I am not against trying something new. You can use one to work the DITRA into the thinset. WebSchluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. Cover the joints with KERDI-FLEX. Neither one absorbs moisture and both offer some interesting features (glow in the dark! I am out of level less than 1/4" from side to side and I'm going over OSB. Kerdi fix does not stick to thin-set FYI. We are very concerned about any moisture at all getting into the OSB. 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. Tile will go over the kerdi. 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. All shower/tub areas should have concrete board (I prefer hardiboard). Doesn't matter, though. No brand recommendation from me. 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. Can I install Kerdi membrane over Hardibacker? For tile installations using the thin-bed method, apply Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar directly to the exposed KERDI surface and install the tiles, ensuring full coverage. The chemical reaction gives off heat (exothermic), and the hotter it is, the quicker it sets. 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. 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. DITRA will prevent OSB from water damage. I accidentally poked a hole through the Schluter-KERDI while installing the membrane. Invictus, by Henley. Dam up any area you dont want/need the leveler to go into. a buddy said J Bridges is now saying he uses modified on top and underneath too. 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. Hello! Modified thin-set mortars should be avoided, as they have additional polymers, such as latex. They can easily be cut to size with a utility knife, or may be extended with dry-pack mortar. Sure, grey might be "OK," but why chance it for less than 20 bucks? OSB, known as Oriented Strand Board, is made of several layers of wood strands bonded using adhesives. How thick is Kerdi membrane with thinset? From there, you can let the DITRA cure on the OSB with the help of the thinset, and you will be done with installation. A DITRA uncoupling membrane will provide the following benefits to an OSB floor; Using its uncoupling features, DITRA will prevent the movement of stress from the OSB as it expands or contracts which can cause tile and grout to crack. 2. Multifunctional building panels: Schluter-KERDI-BOARD, 4. Step 5 Install the DITRA Over the Thinset. Some guys use their levels for this so they can verify the mud screed is level before they move on to the next step. Keep in mind all of the work your doing. A couple of questions: What color grout are you planning to use? For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc. Seems like a decent choice when no other is readily available. Sorted by: 4. That can be mitigated by using DITRAs waterproofing capabilities. To allow for greater movement, the center section of the KERDI-FLEX can be tucked into the cavity of the expansion joint prior to bonding. Higher latex content is essential for bonding to plywood. WebWith the KERDI-SHOWER-TT thin shower tray on a wood subfloor, you can build up the rest of the bathroom floor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the OP said he did his install with TEC Fullset Plus which is a premium unmodified and one of the best out there. "I am the master of my fate, I am the captain of my soul." and be done with it. Schluter-KERDI is a pliable, sheet-applied, bonded waterproof membrane and vapor retarder with limited crack-bridging capabilities. The material is physiologically safe and does not require special disposal. Its now time to get messy. It's easier to get things level when applied thicker, but that may not be what you want because of height stackups. The time to dampen the Hardi is before you put thinset and tile on top. or glitter, etc.). There is no problem applying Kerdi Membrane over your plaster walls. Well, im fearful but interested. Waterproofing Corners: Schluter-KERDI-KERECK, 1. Excellence is its own reward! So, it is safe to install DITRA over OSB. J. Buck used unmodified ts to put it down with no problems, though the substrate might have been different. Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. The gridlines printed on the surface are helpful for neat and quick installation. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. Does unmodified thinset stick to plywood? bags at Lowe's that you can get for less than the cost of a 50lb bag. I'm good front to back (32" depth). 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. Yes. KERDI-BOARD, a multifunctional waterproof building panel, gives you more control over your tile installation project by providing you with the means to simply and easily create ideal substrates for tile. No. Therefore, do not be surprised when you find this material used as the subfloor of your home. No. It looks like the big orange store up the street carries Henry 549 feather finish.
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