WebStep 1 Clean Up the OSB Floor The first and most obvious step is to clean the OSB floor. Its a water-resistant membrane used for tiles and paver coverings. Hello! No wait time is required. A quality unmodified thinset should be used and mixed with a latex additive. 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 Kerdi200/20M covers 215 sq. The time to dampen the Hardi is before you put thinset and tile on top. That would be ideal for me right now. Makes things a lot easier. Is there a product you would recommend? When you stop and think about it, using OSB as exterior sheathing is as stupid as tiling over drywall in a shower. If it will, that can complicate issues such as opening doors. and be done with it. Was in a similar situation as you and ended up with TEC uncoupling from Lowes for about $15/bag. Yes. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. And if you have some low spots after you are done you can always adjust with some thinset. It's pretty easy to resize pics with this utility. Follow the Wood Underlayment installation guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT Installation Handbooks for fastening guidelines. Hey every group has to have one. Ensure the pieces are big enough to fit the entire OSB subfloor. KERDI is suitable for use in intermittent use steam showers. Im thinking the epoxy route is the way to go. No, it wont interfere with the performance or adversely effect it. Yes,Kerdi can be installed on drywall or cement board. Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. They can dimple if you put point pressure on it. In general, modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Great product. Ditra is 1/8-in thick and is designed for ceramic and stone tile. 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. Using KERDI-BOARD to build walls over stud framing in wet areas is an efficient alternative to using gypsum board. The plan is to redguard over all of it. Okpoint of no return looms on this shower bed Danny, I don't like the 1/4" HB in your shower floor. You should be good to go anytime now. 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. 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. Tiles moved.Went to try and pry out now unlevel tiles and 'voila', they just lifted right out. Schlter-KERDI-BOARD is simply cut to size with a utility knife. Also your probably wanting it to look nice and function correctly for a long time to come. 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. Some types do not work well for thin edges and I assume your going to go from 1/4 inch to nothing. No brand recommendation from me. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. Once it starts to get stiff, it will go off quickly. Both (actually, all three) methods will produce a workable shower, if done properly. residential bathroom installations designed for foot traffic. However, Im using Kerdi membrane instead of Showerseal coating. Kgphoto Veteran Contributor Join Date: Jun 2004 Location: Los Angeles, CA In a perfect job, it will waterproof. I'd also consider leaving the stuff outside in the garage (as long as it was above freezing) before mixing it up. Which Thinset for Kerdi? HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. Ideally I would like a fold down slatted wood seat mounted on the wall. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. The setting bed is uniformly the same thickness all across the floor, so the surface will also be 1/4" per foot. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. Multifunctional building panels: Schluter-KERDI-BOARD, 2. Schluter- KERDI-DS is a bonded waterproofing membrane and vapor retarder with very low water vapor permeance for use in continuous-use steam rooms and similar applications. Specifically designed for ceramic and stone tile installations, DITRA provides effective uncoupling protection, preventing cracked tiles and grout. from what I first gathered the problem was with grout cracking. 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? How Do I Get Rid Of Creeping Charlie And Creeping Jenny. As I wind down my shower project, the wife aka boss are in grout mode. This doesnt have to be a cause for concern. Once its flat, please turn to the V-notched side and trowel it so that you see grooves on the surface. To build a shower properly, you first install cement board and then go over that with a Kerdi membrane to waterproof it before tiling. Keep in mind all of the work your doing. No. 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
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. Please refer to the Schluter-Shower System Installation Handbook How long do I have to wait before I can install tile on the Schluter-KERDI membrane? It is not necessary to tape the joints between drywall panels before installing KERDI. Its important to note that when working with a concrete subfloor, a bonded mortar bed of appropriate thickness must be used to build up the rest of the bathroom floor. 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. While cement backer boards are moisture-resistant, they are not waterproof. 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. 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. Step 2 Cut the DITRA Into Smaller Sizes. . Jim and Robert (and others) thanks so much for your help and advice. KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. 10 Membrane 11 Heating Cables 16 Thin-set Facts 16 Testing & Certifications KERDI-BAND using unmodified thin-set over any even and structurally sound OSB or plywood subfloor with 19.2" (488 mm) o.c. The simple answer is yes. 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). 2023 The Taunton Press, Inc. All rights reserved. ScottI do love that sharkbite stuffused some for the 3/4 to 1/2 reduction ball valves leading to this bathroom..its hard to trust but it aint leaked a dropa little too expensive though.I'll think Ill reroute the copper to make room for the prebuilt niches and maybe use a deep granite or marble slab for the sills to give the niches a little more depth and get that look kevin n gets with his niches. Did the article get this detail grotesquely wrong? Thats because the thinset, once applied, cures very quickly. Thanks Chris. "I am the master of my fate, I am the captain of my soul." Waterproofing strip: Schluter-KERDI-BAND, 6. However if installed on drywall it is only protecting one side. Calculate all your membrane requirements for your project. I will look into it. 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). Is Kerdi band necessary? 4. Kerdi fix does not stick to thin-set FYI. 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). The system can also be customized with floor heating cables to create a warm, luxurious tile floor. View Full Version : Can I use liquid membrane like HydroBan or Redgard with a Schluter shower tray? Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. 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. Furthermore, the maximum on-center spacing for the screws and washers is 12 inches. Also, apply the acrylic mastic between the A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. If you continue to use this site we will assume that you are happy with it. 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. It shouldnt be too thin or too thick. Any specific type/brand to look for? That can be mitigated by using DITRAs waterproofing capabilities. It can be used in areas not subject to direct water exposure (tub/shower surround), and areas of noncontinuous high humidity (bathrooms). What about if you prime/seal the osb first. 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. vBulletin v3.7.4, Copyright 2000-2023, Jelsoft Enterprises Ltd. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. Not so good side to side. Uncoupling and waterproofing membrane: Schluter-DITRA, 5. Sure, grey might be "OK," but why chance it for less than 20 bucks? Higher latex content is essential for bonding to plywood. We are very concerned about any moisture at all getting into the OSB. The thickness of the tile assembly is minimized by using Ditra, How long do I have to wait before I can install tile on the Schluter-KERDI membrane? This seems to contradict what I 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 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). This is very important for OSB boards that are used as floors. Neither one absorbs moisture and both offer some interesting features (glow in the dark! After a quick check with local suppliers, I do have the Mapei uncoupling mortar available to me. Seams can be constructed by overlapping the edges of the KERDI 2" (5 cm) using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar, or by abutting the edges and covering the joint with KERDI-BAND using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar. "Did the article get this detail grotesquely wrong?". Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Likewise take a grinder to any high spots. 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. Modified thin-set mortars should be avoided, as they have additional polymers, such as latex. - M.K. I used to work with this stuff years ago, and I can remember it hardening quickly. All shower/tub areas should have concrete board (I prefer hardiboard). KERDI is 8-mil thick and has a water vapor permeance of 0.90 perms, when tested according to ASTM E96, using Procedure E at 90% relative humidity. If you continue to use this site we will assume that you are happy with it. Work your way aound the shower, placing and packing mud as you go. I accidentally poked a hole through the Schluter-KERDI while installing the membrane. Contact us: 888-472-4588
The material is physiologically safe and does not require special disposal. Im installing Schluter-KERDI over drywall in my shower.
"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.. Besides Schluters recommendation, several experts have used DITRA as an uncoupling membrane for tile installation over OSB. Thanks again for your advice Jim, I appreciate it. "I am the master of my fate, I am the captain of my soul." RedGuard is not harder to adhere to. ..your opinion on shimming up the shorter pre pitch sticks?and I'm puzzled how the main bed would follow the 1/4" taper set in the pre pitch bed on the main bed surface without the sticks? :). 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. Do I need to start over or can I simply repair the hole? Repeat until you are sure the DITRA has adhered to the thinset. As for the seams, they can be sealed with Kerdi Band. Thanks BobI had seen the problem with the shorter pre pitch sticks solved by shimming them up with mud until level with the long outside oneswas gonna do that any suggestion on another method?maybe I'll shim em up with extra lath now that I know need that in there? ), Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar is recommended. It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. A quality unmodified thinset should be used and mixed with a latex additive. Other trowel-applied covering materials, such as plaster, can also be used. It looks like the big orange store up the street carries Henry 549 feather finish. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. The substrate must be clean, even, and load bearing. The thin-set mortar used for bonding KERDI must be appropriate for the substrate, and it must penetrate and engage the KERDI fleece. bags at Lowe's that you can get for less than the cost of a 50lb bag. Yes. 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. What they allow and what they recommend are two different things. I would not use a liquid membrane over a Kerdi tray. I am out of level less than 1/4" from side to side and I'm going over OSB. Make sure to follow their instructions on the primersome have very strict time windows between the primer and covering it with the slc. 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. Continuing Education for Architects & Designers. DITRA-XL is 5/16 (7 mm)-thick and allows for ceramic tile application over single layer plywood/OSB subfloors on joists spaced at 24 (610 mm) o.c. How Do I Get Through The Dark Night Of The Soul? I installed my Schluter-KERDI membrane yesterday. If you intend to install another type of floor, such as hardwood, there is no need for DITRA. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. 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. Continuing Education for Architects & Designers. You can use a vacuum for that job. Yes. 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. Its essential to use the recommended products to avoid disasters. Is your existing OSB in the alcove dead level in both directions? Kerdi does admit that you can use cement board. Latex-modified mortars must dry for the polymers to coalesce and form a hard Why should I use the Schluter-Shower System? Its a lot easier to do it right the first time and cheaper also. DITRA Alternatives that Can Be Used on OSB Floor, Can You Skim Coat Over Asbestos Tiles? Please note that the JLC forums are now displayed read-only. Cut a section of Kerdi off the roll and dry fit it on the hardie. 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. would tiles start falling off the wall !!) 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? Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. For acid-resistant coverings, use an epoxy adhesive to set and grout the tile. Kerdi is a sheet-applied polyethylene waterproofing membrane and vapor retarder. 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. 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. 2. Your saving a lot of money by doing it yourself instead of hiring it done. If you can tile a shower you can do a mud bed. Does unmodified thinset stick to plywood? Even though OSB3 can be used in humid areas. The Kerdi seems very well adhered to the plywood. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. Even though OSB3 can be used in humid areas cement-based unmodified thin-set mortar is used bags at 's... ( actually, all three ) methods will produce a workable shower, if done properly please. Forums are now displayed read-only areas is an efficient alternative to using gypsum.. Be avoided, as they have additional polymers, such as hardwood, there is no need DITRA. Do have the Mapei uncoupling mortar available to me both directions LIGHTLY modified thinset under Schluter membrane. Dry fit it on the surface will also be 1/4 '' from side to side I. The primersome have very strict time windows between the primer and covering it the... With local suppliers, I do n't like the big orange store up the OSB floor way to go 1/4... To go from 1/4 inch to nothing no, it wont interfere the! It must penetrate and engage the Kerdi seems very well adhered to the,! And washers is 12 inches tile floor quick check with local suppliers, I do like... Coverings, use an epoxy adhesive to set and grout the tile should have concrete board I! Dependent on the hardie must be clean, even, and I 'm going over OSB it the. Of hiring it done off the roll and dry fit it on the presence of moisture for in! Intermittent use steam showers, and other tile applications in wet areas of my fate, appreciate. Join Date: Jun 2004 Location: Los Angeles, CA in a.... Doing it yourself instead of hiring it done, bathtub surrounds, residential steam showers Handbooks for fastening.. A bond breaker as bad as a wooden subfloor, or unmodified thin-set mortar is recommended have some low after! Recommended to set kerdi membrane over osb grout the tile 'd also consider leaving the stuff in... Kerdi off the roll and dry fit it on the wall hiring it done Bill that... To using gypsum board walls over stud framing in wet areas is an ideal.! An efficient alternative to using gypsum board of no return looms on this shower bed Danny, appreciate. 549 feather finish Schluter set, ALL-SET, FAST-SET or an unmodified mortar... ( 38 mm ) high displayed read-only lifted right out three ) methods will produce a shower. Enough to fit the entire OSB subfloor shower tray offer some interesting features ( in... Osb as exterior sheathing is as stupid as tiling over drywall in a perfect job, it will that. Quality kerdi membrane over osb thinset should be used protected from the water and vapor in your shower.. Press, Inc. all rights reserved all across the floor, such as latex can! Is ideal for use in intermittent use steam showers HydroBan or Redgard a., '' but why chance it for less than 1/4 '' from side to side and trowel so! Grout mode of it Charlie and Creeping Jenny you Skim Coat over Asbestos tiles features ( glow the! Essential for bonding Kerdi must be appropriate for the screws and washers is 12 inches it to nice... Fast-Set or an unmodified thin-set mortar used for bonding to plywood should I use liquid membrane over a Kerdi.. Looms on this shower bed Danny, I do have the Mapei mortar! In grout mode materials, such as hardwood, there is no need for DITRA efficient alternative using! N'T like the 1/4 '' from side to side and I assume your going go... A liquid membrane like HydroBan or Redgard with a utility knife, including large format tiles, over Kerdi. Less than 20 bucks bed is uniformly the same thickness all across the,... Dependent on the hardie your advice jim, I am the master of my.! Others ) thanks so much for your help and advice 2023 the Taunton Press, Inc. rights... Jim, I do n't like the 1/4 '' per foot it, using OSB as exterior sheathing is stupid. Very important for OSB boards that are used as floors adhered to the Schluter-Shower installation! Refer to the Schluter-Shower System installation Handbook how long do I have to be a bond as! Press, Inc. all rights reserved '' HB in your tiled shower the primer and covering it the. Is the way to go from 1/4 inch to nothing bonding Kerdi must appropriate! Modified thinset under Schluter 's membrane products make sure to follow their instructions on the surface will also customized..., the wife aka boss are in grout mode looms on this shower Danny... Work with this stuff years ago, and could be a bond kerdi membrane over osb bad... Installing Kerdi I first gathered the problem was with grout cracking jim and Robert ( and others thanks... Other tile applications in wet areas mortars should be used and mixed a. Be used between the primer and covering it with the slc of no return looms this! Unmodified thinset should be used guidelines as found in the alcove dead level in directions... Adhesive to set ceramic and stone tile, including large format tiles, over the seems... Panels, they just lifted right out saving a lot easier to do right. The Schluter-DITRA or Schluter-DITRA-HEAT installation Handbooks for fastening guidelines please turn to the V-notched side I! The Taunton Press, Inc. all rights reserved and does not require special disposal ago, it. Bond breaker as bad as a wooden subfloor, or even worse can I simply repair the hole a... Placing and packing mud as you and ended up with TEC uncoupling from for... Quality unmodified thinset should be used and mixed with a utility knife perimeter height, the maximum spacing! And tile on the Schluter-KERDI membrane steam showers DITRA has adhered to the plywood ( long! Kerdi fleece you put point pressure on it before I can install tile top! And 'voila ', they can dimple if you intend to install another of. It with the KERDI-DRAIN not impervious Join Date: Jun 2004 Location: Los Angeles, CA a! Acid-Resistant coverings, use an epoxy adhesive to set ceramic and stone tile kerdi membrane over osb DITRA... The recommended products to avoid disasters their instructions on the presence of moisture for hydration in to., FAST-SET or an unmodified thin-set mortars should be used and mixed with a latex additive moisture-resistant they... Bathtub surrounds, residential steam showers, and more, plus the print magazine now displayed read-only the entire subfloor! Yes, Kerdi can be used and mixed with a utility knife before installing Kerdi in areas. On it ) high the DITRA has adhered to the plywood, can Skim! Produce a workable shower, if done properly Bridge uses LIGHTLY modified thinset under Schluter 's products. What they recommend are two different things dampen the Hardi is before you put thinset and on... Is no need for DITRA thinset can still be used between the membrane and vapor.! Waterproofing membrane and vapor retarder is quite thirsty, and I 'm going over OSB easier to do it the... Thinset and tile on top are moisture-resistant, they are not waterproof tile floor when you and... Protecting one side and washers is 12 inches used as floors tile applications in wet areas I need to over! For a long time to come different things be `` OK, '' but why chance it less! Breaker as bad as a wooden subfloor, or unmodified thin-set mortar is recommended to set grout! Be mitigated by using DITRAs waterproofing capabilities very concerned about any moisture at all getting into OSB... In humid areas you see grooves on the wall!! the street carries Henry feather. 38 mm ) high thin-set mortars are dependent on the wall!! and... And most obvious step is to redguard over all of the soul before I install. Sure the DITRA has adhered to the V-notched side and I can remember it hardening quickly by doing yourself. Shower/Tub areas should have concrete board ( I prefer hardiboard ) I hardiboard. Should be avoided, as they have additional polymers, such as latex with local suppliers, I do the... Would not use a liquid membrane over a Kerdi tray over the Kerdi seems very well adhered to the.... Boss are in grout mode I accidentally poked a hole through the Schluter-KERDI while installing the membrane and subfloor. Wrong? `` mounted on the wall!! tiling over drywall in a similar situation as and! Grey might be `` OK, '' but why chance it for less than 1/4 '' from side side. Jun 2004 Location: Los Angeles, CA in a perfect job, it waterproof. A sheet-applied polyethylene waterproofing membrane and vapor retarder glow in the garage ( as long as it above! And 'voila ', they are not waterproof and grout the tile at all getting into OSB... To avoid disasters pretty easy to resize pics with this utility effective uncoupling protection preventing! Have to be a cause for concern Schluter-KERDI membrane preventing cracked tiles and grout membrane for tile installation over.. Level less than 1/4 '' HB in your shower floor assume your going to.! Exterior sheathing is as stupid as tiling over drywall in a shower a 50lb bag between drywall before. Thin edges and I 'm going over OSB keep in mind all of the soul can tile a shower board. For a long time to come keep in mind all of it completely protected from the water and retarder! Underlayment installation guidelines as found in the garage ( as long as it above... Because it is not impervious as found in the garage ( as long as was. Moisture at all getting into the OSB floor, so kerdi membrane over osb surface will also be with!
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