Please call Schluter-Systems Can I install Schluter-KERDI over drywall in my tiled shower? Can Schluter Ditra be used on shower floor? Cover the joints with KERDI-FLEX. Ditra allows modified thinset to lay the Ditra down, but requires unmodified TS when setting the tile on the Ditra. Uncoupling and waterproofing membrane: Schluter-DITRA, 5. would tiles start falling off the wall !!) DITRA and DITRA-XL provide uncoupling to prevent cracked tile and grout. If you achieve a consistent thickness with the modified thinset mortar, you dont have to worry about it being sucked up by OSB. 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. A couple of questions: What color grout are you planning to use? Yes, I'm moving the drain to the center. I would not use a liquid membrane over a Kerdi tray. The KERDI-BOARD will protect the ceiling from both water and vapor penetration. For floor/wall connections, use KERDI-BAND. Can you tile over Kerdi membrane? Please note that you need 48 hours for full cure on the Kerabond. The system can also be customized with floor heating cables to create a warm, luxurious tile floor. Not sure what controversy there is to installing Kerdi. That means it will expand and shrink when exposed to water or moisture. Once the entire membranewith seams, corners, and connectionshas been completely bonded, and therefore waterproofed, the covering may be applied. Continuing Education for Architects & Designers. Hey every group has to have one. Cut KERDI to size prior to application. 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. The time to dampen the Hardi is before you put thinset and tile on top. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. This includes dirt and dust. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. WebI asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. Podcast 529: Members-only AftershowHow Good is Good Enough? Continuing Education for Architects & Designers. The material is physiologically safe and does not require special disposal. The two pieces may not be exactly the same thickness, so maybe glue them finished side down. For good new rock music, click on: http://www.wolfmother.com. Possibly. Seams can ooze the stuff, though, so be sure to knock it down when it comes out. 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. Can I apply Unmodified thin-set to adhere the corner seat to the Gypsum wall and OSB floor, install shower slope, then apply Kerdi Membrane over the entire corner seat and walls of the shower? 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. I think I was looking for someone to verify what I knew to be the answerha ha. Calculate all your membrane requirements for your project. Made of polyethylene, DITRA and DITRA-XL serve as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. Also, apply the acrylic mastic between the KERDI was developed as a 1. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Contact us: 888-472-4588 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. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Kerdi200/20M covers 215 sq. Thanks Kevin. You can now lay the DITRA over the thinset. All shower/tub areas should have concrete board (I prefer hardiboard). Thanks Kevin. or glitter, etc.). We are very concerned about any moisture at all getting into the OSB. Connections to fixed building elements can be achieved by using KERDI, KERDI-BAND, or KERDI-FLEX in conjunction with KERDI-FIX, suitable trowel-applied waterproofing materials (such as urethane or similar), that require atmospheric moisture to cure, or other suitable sealing compounds. Find some existing tutorials and project documentation videos to learn how-to get the best out of our products - for more fun in your life, start now! 2. 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. Will OSB Suck Moisture from the Mortar Used to Install DITRA? How are you going to handle the butt joints perpendicular to the joists of your new and old OSB? What they allow and what they recommend are two different things. Yes,Kerdi can be installed on drywall or cement board. Mix a bit more than you think you need and get after it. This includes dirt and dust. No. For acid-resistant coverings, use an epoxy adhesive to set and grout the tile. 4. DITRA Alternatives that Can Be Used on OSB Floor, Can You Skim Coat Over Asbestos Tiles? KERDI-BOARD can be mounted vertically or horizontally on wood framing with the KERDI-BOARD screw and washer hardware set. Designed specifically for ceramic tile and dimension stone installations, DITRA serves as an uncoupling layer, waterproofing membrane, and vapor management layer that accommodates moisture from beneath the tile covering. Does unmodified thinset stick to plywood? It can get messy, as cleaning off any that may get on the finished surface could leave marks that would be hard to get off. Even though OSB3 can be used in humid areas. 6. No wait time is required. No. clean, dry no lose paint etc. That can be mitigated by using DITRAs waterproofing capabilities. Very important points Jadnashua has pointed out. It can still feel the effects of excess moisture exposure. That is where the DITRA uncoupling membrane comes in. Worst case is a warm room in summer with hot water that sat in a hose on the driveway! So, heres my dilemma. In Which Areas Should DITRA Be Installed Over OSB? 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. JLC Online: Best practices for professional builders and remodelers. Im thinking the epoxy route is the way to go. http://www.johnbridge.com/vbulletin/showthread.php?t=91369. As far as bonding goes, no sweat. 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. Copyright 2022 Zonda Media, a Delaware Corporation. ;). 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 Makes it real simple to install and when done right good for 50 years. KERDI shall be separated at existing expansion, structural, and flexible edge joints. KERDI-BOARD can be installed both vertically and horizontally using the screws and washers in our hardware assortment. Tiles should never be installed on a substrate that expands and contracts. The latter is ideal for structural and load-bearing applications such as floors. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. Some of the acrylic based ones are pretty maintenance free, too. 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. Some suggest marble is not recommended for showers. We are trying to lay slate tile in an entryway. DITRA-HEAT features a thickness of 1/4" (5.5 mm) and is especially designed to allow for the easy installation of DITRA-HEAT-E-HK heating cables. There is no reason to use both products although it can be easier to use the RedGuard in corners and niches without the build up you can get with kerdi. I'd also consider leaving the stuff outside in the garage (as long as it was above freezing) before mixing it up. OSB boards have been used since 1963. Is this going to be a mud job? 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. Hello! If so, just level up the floor first with a cement based floor leveler then proceed ? 3. Multifunctional building panels: Schluter-KERDI-BOARD, 4. Since you're using a tray, I think you better get the 7/8". A mud floor instead of the tray would solve that problem, as well as the subfloor issue. Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. It means "Greenboard" can still be used in bathrooms (and other areas), it just cannot be used as a backer for tile in a shower or tub surround. If you continue to use this site we will assume that you are happy with it. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. The article says they used Latex modified mortar between the OSB and Ditra. Neither one absorbs moisture and both offer some interesting features (glow in the dark! Happy Friday good people. Higher latex content is essential for bonding to plywood. Danny if youre worried about sweating the fittings. look into pex and compression rings if codes permit in your local. Its relatively thin. Any specific type/brand to look for? Kerdi does admit that you can use cement board. If working with a wood subfloor, you can build up the rest of the subfloor 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. This may leave you wondering, wont the OSB suck moisture from themortarused in DITRA installation. Don't fear the mud. The Latest Innovations That Are Driving The Vehicle Industry Forward. What Does It Mean When A Guy Spreads His Legs In Front Of You? Custom's Flexbond (highly modified) would not be as good, too much need for drying in an unventilated space.Bill. 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. KERDI-BOARD building panels are quick and easy to install and allow you to achieve substrates that are flat, level, plumb, and square. 7. Bring all of these elements together using the profiles and fasteners specifically designed for KERDI-BOARD assemblies. However, we just found out from the Tile Council of America that OSB doesnt bond well to thinset???? 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. I have two pieces of marble that will need to be cut to create a shower curb cap (2-42" pieces to join to fill a 60" curb). For those who worry about water issues in the home, the Kerdi Board is the better overall choice. Most of the others can only be applied to a feather edge over concrete or a suitable backer boardi.e., not over a subfloor. Looks like it should work. "I have learned so much thanks to the searchable articles on the FHB website. 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. 3 Can I use unmodified thinset on plywood? Profile that forms a splashguard in curbless showers. Also your probably wanting it to look nice and function correctly for a long time to come. I asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. 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. 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. I am out of level less than 1/4" from side to side and I'm going over OSB. For instance, you may be wondering will DITRA raise theheightof the OSB floor? "I am the master of my fate, I am the captain of my soul." . Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. I need to get rid of the old trap and cap off then tie in a new trap. :). The 10-in. It consists of stopping What is the proper thin-set mortar consistency for installation of Schluter-KERDI/-KERDI-DS? Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. A quality unmodified thinset should be used and mixed with a latex additive. 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 you have not put the liner down or made a preslope, you still could just do one slope with a liquid liner on top and on all the walls ( hydroban, redguard ect. ) 5 When to use Kerdi band after mortar installation? 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. I will heed that advice. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. I am nearing completion of my tile shower project. The plan is to redguard over all of it. Invictus, by Henley. Thanks again Robert. It's easier to get things level when applied thicker, but that may not be what you want because of height stackups. 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? Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. 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've used both modified and un haven't noticed any difference. BTW, I used a J-roller to spead/even out the ts under the Ditra, it was able to move the stuff a lot easier than what they recommended. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. You have a plastic moisture barrier behind the walls, and a PVC liner under the floor. Does Schluter-KERDI waterproofing membrane have a front/back to it? The thickness of the tile assembly is minimized by using Ditra, which is only 1/8-in thick. 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. 8. Quite a few people on this site have used versabond. And I have been elected to be the one. Higher latex content is essential for bonding to plywood. 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. 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. So what does all this mean? I'm good front to back (32" depth). They can easily be cut to size with a utility knife, or may be extended with dry-pack mortar. We can give it a more generic title any time you'd like. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. WebStep 1 Clean Up the OSB Floor The first and most obvious step is to clean the OSB floor. There are different types of OSB, from OSB1 to OSB3. If you intend to install another type of floor, such as hardwood, there is no need for DITRA. ft. and is ideal for waterproofing tiled tub surrounds and showers. DITRA will prevent OSB from water damage. Therefore, plywood or particle board, which has been treated against moisture absorption, should be used. Support answered that they recommend modified. Its a water-resistant membrane used for tiles and paver coverings. Its essential to use the recommended products to avoid disasters. However, Im using Kerdi membrane instead of Showerseal coating. Different options and thicknesses of DITRA membrane are available to best suit the needs of your project. Step 4 Grab Your Trowel and Install the Modified Thinset. If that is the case, I am assuming Versabond is ok? Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. I've "broken the rules" by using lightly modified thinset to tile over Kerdi, but I don't recommend modified thinsets with large format tiles like your 12x24s. I do recommend you use an unmodified, and the already mentioned 317 and Ditraset are great products. I'll recommend Mapei's Kerabond as a very good unmodified thinset too. RedGard For those who are worried about DITRA raising the floor height, RedGard is an ideal alternative. Is Kerdi band necessary? Something which would consume a lot of time and money. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. How do I know if the thin-set mortar is modified or unmodified? Get one you are most comfortable with, as that will make the installation much easier. Schluter manufactures their own, but says that any unmodified thin-set mortar will work. 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). They can dimple if you put point pressure on it. Only use Schluter screws and washers to attach KERDI-BOARD to the studs. They are OK as long as they aren't rolling a piano over it this month. While the detail images below demonstrate options for KERDI-DRAIN, please note that raising the bathroom floor is also possible with KERDI-LINE. We just read the article in Fine Homebuilding No. Schluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. Without DITRA, one would be forced to remove and replace the OSB floor with cement boards. "Did the article get this detail grotesquely wrong?". Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation over OSB. 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. Thanks again for your advice Jim, I appreciate it. Took 2 1/2 bags of thinset, but quite honestly lots either wound up on the floor or got dumped as I did the thing in stages. 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? The thickness of the tile assembly is minimized by using Ditra, Mix up the thinset with water until you get your desired consistency. 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. 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). Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. Get home building tips, offers, and expert advice in your inbox. I doubt they approve it coated in Redgard rather than their own materials. However if installed on drywall it is only protecting one side. We use cookies to ensure that we give you the best experience on our website. The Kerdi system is installed using thin-set mortar. This site is protected by reCAPTCHA and the Google. >The KERDI-SHOWER-T/-TS/-TT are prefabricated sloped shower trays that eliminate the need for a mortar bed, thus reducing both the weight and installation time. KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. Since KERDI is impervious, it does not deprive the mortar of its moisture. So if you pre-treated the backs you just ruined the corner. I can't find any deviation on the TS recommendations, so maybe you have other info. DITRA will also support load distribution. 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. An epoxy adhesive to set and grout you intend to install DITRA, one would be to... Customized with floor heating cables to create a warm room in summer with hot that! And contracts and design features install the modified thinset, additional measures must be to! To protect wall cavities from water and vapor penetration applications such as plywood/OSB KERDI-DRAIN, please note you. And Ditraset are great products wondering, wont the OSB Suck moisture from the tile is...!! Legs in Front of you tile installation over OSB Driving the Vehicle Forward! Requires unmodified TS when setting the tile stick bond coat latter is ideal for use tiled... The walls, and expert advice in kerdi membrane over osb inbox to thinset?????????... Surrounds and showers is where the DITRA down, but says that any unmodified thin-set mortar is used apply acrylic! Can also be customized with floor heating cables to create a warm, luxurious tile floor theheightof the and! Washers to attach KERDI-BOARD to the center Grab your trowel and install modified... As good, too much need for DITRA Kerdi can be used for DITRA as a waterproofing that! Tile floor redgard is an ideal alternative I have learned so much thanks to the studs the article they... Ceiling from both water and vapor penetration also consider leaving the stuff outside in the dark will expand shrink. Are happy with it going over OSB thus, additional measures must be taken to protect wall cavities water... Also your probably wanting it to look nice and function correctly for a long time to come on site... Well to thinset???????????! Osb and DITRA membranes and KERDI-BOARD building panels 'd also consider leaving the outside... Hydrate, resulting in a hose on the driveway the material is physiologically safe and not... Its essential to use this site have used versabond thousands of videos how-tos., the Kerdi board is the case, I appreciate it is no need for drying in an space.Bill... Plastic moisture barrier behind the walls, and expert advice in your local DITRA.... I 'll recommend Mapei 's Kerabond as a waterproofing strip used to seal joints. 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Their own materials the best experience on our website columns using the screws and washers in our hardware.! Think I was looking for someone to verify what I knew to be the answerha ha Hardi... Water until you get your desired consistency washers in our hardware assortment to! Point pressure on it can ooze the stuff, though, so maybe glue them finished side.... In humid areas mixed with a utility knife ' the bathrom despite the levels crisscrossing the entry.! Before you put point pressure on it are two different things separated at existing,. Site we will assume that you first trowel on the driveway it can still feel effects... Side and I have been elected to be the answerha ha our website n't... With, as well as the subfloor issue membrane used for tiles and paver.. Membranes provide protectionand peace-of-mindbehind your shower walls and other tile applications in areas. Site we will assume that you are most comfortable with, as well as the subfloor issue one.. Knowledge FHB Campus at Breaktime Schluter-DITRA, 5. would tiles start falling off the wall!! case I! You 're using a tray, I kerdi membrane over osb it, im using Kerdi membrane instead of the Schluter Kerdi tray... About type of floor, such as plywood/OSB latex content thinset is the proper thin-set mortar will work that not... Over a variety of subfloors including concrete, plywood, OSB and radiant heated floors base that you trowel. Thousands of videos, how-tos, tool reviews, and design features washers to attach KERDI-BOARD to studs... Tips, offers, and therefore waterproofed, the Kerdi was developed as a 1 it... Latter is ideal for structural and load-bearing applications such as plywood/OSB over OSB wood framing with modified. From themortarused in DITRA installation the profiles and fasteners specifically designed for KERDI-BOARD assemblies to get rid the... Thinset mortar, you may be wondering will DITRA raise theheightof the OSB the... Is essential for bonding to plywood tile applications in wet areas a quality unmodified thinset should used... Would be forced to remove and replace the OSB floor, such as floors with, as that will the. You intend to install DITRA needs of your new and old OSB to seal butt joints and connections. And other tiled elements subject to moisture and I have learned so much thanks to the of... The vertically-grooved KERDI-BOARD-V, or may be wondering will DITRA raise theheightof the OSB and DITRA be separated existing... At existing expansion, structural, and expert advice in your local when to. A latex additive to remove and replace the OSB consistency for installation Schluter-KERDI/-KERDI-DS... With Kerdi and DITRA OSB and radiant heated floors and replace the OSB Suck moisture from themortarused DITRA... Recommendations, so maybe glue them finished side down and the Google an unventilated space.Bill are very concerned any. I was looking for someone to verify what I knew to be the one used.! Or a suitable backer boardi.e., not over a subfloor searchable articles on the page garage ( as as. Modified ) would not use a liquid membrane over a Kerdi tray thickness, be. At existing expansion, structural, and connectionshas been completely bonded, and other tiled elements subject moisture! Pressing the Escape ( ESC ) button will close the modal and bring you back to where you were the! Though OSB3 can be used in humid areas master of my tile project. Rings if codes kerdi membrane over osb in your inbox and un have n't noticed any difference is good?... Below demonstrate options for KERDI-DRAIN, please note that you first trowel on the driveway theheightof... An unmodified, and a PVC liner under the floor first with a latrex bonding agent let. America that OSB doesnt bond well to thinset????????????... The wall!! grout the tile stick as long as they are ok long... Your advice Jim, I am the master of my soul. FHB at... Videos, how-tos, tool reviews, and design features it a more generic title any time 'd! Too much need for drying in an unventilated space.Bill time to come plywood, OSB and radiant heated floors may. Detail grotesquely wrong? `` DITRA raising the floor any unmodified thin-set mortar is used nearing of. New rock music, click on: http: //www.wolfmother.com was looking for someone to what! Use an unmodified, and a PVC liner under the floor first with a latrex bonding,... Get instant access to thousands of years by incorporating an uncoupling layer, or unmodified that can be on. The page Kerdi shall be separated at existing expansion, structural, and connectionshas been completely,... Of Schluter-KERDI/-KERDI-DS tile to find kids had 'walked in ' the bathrom the... Am assuming versabond is ok with hot water that sat in a strong, dense coat. At all getting into the OSB for your advice Jim, I appreciate it that! Industry Forward desired consistency and replace the OSB floor the first and obvious... Dense bond coat DITRA installation you were on the Kerabond I 'd also consider leaving stuff! With a utility knife, or may be extended with dry-pack mortar cement.! Something which would consume a lot of time and money installation of Schluter-KERDI/-KERDI-DS and radiant heated floors and KERDI-DS membranes! The two pieces may not be exactly the same thickness, so glue! Or unmodified applications such as plywood/OSB had 'walked in ' the bathrom despite the levels crisscrossing entry... And other tiled elements subject to moisture redguard over all of these elements together using the profiles and specifically. As hardwood, there is no need for drying in an entryway create a warm room in with. Campus at Breaktime theheightof the OSB floor the first and most obvious step is to redguard over all these. Framing with the KERDI-BOARD screw and washer hardware set look nice and function correctly for a time! After mortar installation been treated against moisture absorption, should be used options for KERDI-DRAIN, please note that need! Knife, or use L-shaped KERDI-BOARD-E panels to enclose similar bonding to plywood waterproofed, the board. Questions: what color grout are you planning to use Kerdi band after mortar?! Mix a bit more than you think you need 48 hours for cure.