WebSchluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. Schluter-Systems requires the use of Schluter SET , ALL-SET , FAST-SET, or an unmodified thin-set mortar meeting Can I use a premixed thin-set mortar to install Schluter-KERDI and tile in my shower? Thanks Chris. Its essential to use the recommended products to avoid disasters. The seam in the middle I would think could be whichever you prefer. That means it will expand and shrink when exposed to water or moisture. 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. I never had done drypack before and it was pretty simple to do. 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). It only needs about 1/8" to achieve the 1/4"/foot value. Some suggest marble is not recommended for showers. 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? Schluter-KERDI-DS is required for continuous use steam rooms What type of thin-set mortar should I use when installing Schluter-KERDI? No gypsum levelers ! No. Get home building tips, offers, and expert advice in your inbox. They can dimple if you put point pressure on it. 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? Which Thinset for Kerdi? We are trying to lay slatetile in an entryway. KERDI has been evaluated according to the Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources Using Environmental Chambers, Version 1.1 for California Specification 01350 and found to comply with the VOC requirements. That will eliminate/slow down theloss of moisture from the mortar. Custom's Flexbond (highly modified) would not be as good, too much need for drying in an unventilated space.Bill. Instead, the plywood preparation is done so that it is made water-resistant and more adhesive suitable without using a primer. Hey every group has to have one. 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. You should be good to go anytime now. 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? Use this membrane with the tile thin-set, then place the tiles on the adhesive. The Kerdi foam shower tray needs to be applied with thin set under it ? Higher latex content is essential for bonding to plywood. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. Uncoupling membrane prevents cracked tile and grout. As for the seams, they can be sealed with Kerdi Band. Kerdi Trouble - Testing it, have concerns. DITRA has a nominal 1/8" (3 mm)-thickness which minimizes tile assembly thickness. I figured on 2 but had to pick up one more later, but my local tile shop has a wide variety of brands in stock. How long does Kerdi have to dry? All shower/tub areas should have concrete board (I prefer hardiboard). 4. What about if you prime/seal the osb first. This means: A minimum of 5/8 nominal plywood or OSB thickness installed over joists on 16 centers. Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. Almost like a hydraulic cement. That is where the DITRA uncoupling membrane comes in. Ceramic Tile Advice Forums - John Bridge Ceramic Tile. To ensure the floor is clean, wipe it with a wet sponge. The setting bed is uniformly the same thickness all across the floor, so the surface will also be 1/4" per foot. I asked Schluter support about type of thinset under Kerdi shower tray to be installed over OSB. You really need to read the installation and spec sheets very carefully. over expansion joints or construction joints. Was in a similar situation as you and ended up with TEC uncoupling from Lowes for about $15/bag. How do I know if the thin-set mortar is modified or unmodified? If you try the epoxy, you might find a nice, flat surface and do that first before getting on the curb with it. Using KERDI-BOARD to build walls over stud framing in wet areas is an efficient alternative to using gypsum board. A fully waterproof assembly is easily achieved by sealing seams and fastener penetrations with KERDI-BAND. How do you install a Kerdi bathroom floor membrane? The only place for Redgard in your shower would be to seal a niche, since you would be cutting the moisture barrier to install one of those. Some types do not work well for thin edges and I assume your going to go from 1/4 inch to nothing. 173 and followed their instructions, laying down 3/4 OSB down and Epoxy grouts are pretty much maintenance free (at least they don't need a sealer). Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. Keep in mind all of the work your doing. Can you use KERDI membrane on plywood floor? KERDI was developed as a There are a lot of concerns one may have when using a product such as DITRA over OSB. Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. If you can tile a shower you can do a mud bed. Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. Kerdi is all about drywall. >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. However if installed on drywall it is only protecting one side. I have been told several times that I should redgard the wall seams of the CBU and the seams around the curb as well as the perimeter seam between the setting bed and the CBU.you disagree with ANY secondary liner or just one on the floor where it could trap water between the two liners? Danny, download Irfanview (http://www.irfanview.com/), a free image viewer/editor. Thanks Kevin. 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? KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. Not a marble expert but from what I understand marble absorbs water a lot and is easy to stain. There is never 'the answer' but 'an answer'. KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. 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. Therefore, it really wont raise the OSB floor very high. Doesn't matter, though. Yes! The time between liquid and starting to set can be quite abrupt. 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. Even though OSB3 can be used in humid areas. The last step is to steel trowel the mud to clean up any loose sand. I would just prime with a latrex bonding agent, let it dry 'till tacky and go for it. On the clean OSB floor, measure and cut the DITRA, ensuring that it fits perfectly. Do I need to tape the joints between panels before installing the KERDI? and KERDI-SEAL-MV at the mixing valve. The Kerdi system is installed using thin-set mortar. Therefore, do not be surprised when you find this material used as the subfloor of your home. 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). 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. Used Ditra just recently. Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. Go with a masonry bench or look into the better bench or nobel bench. A couple of questions: What color grout are you planning to use? Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. Bring all of these elements together using the profiles and fasteners specifically designed for KERDI-BOARD assemblies. How do you prepare OSB subfloor for tile? Jim and Robert (and others) thanks so much for your help and advice. 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. Tile will go over the kerdi. Thanks for the reply, I appreciate it. You can now lay the DITRA over the thinset. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. The Laticrete 255 Therefore, its best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating . Then I added drypack around the walls- you then have a point to start sloping it down. "I am the master of my fate, I am the captain of my soul." However if installed on drywall it is only protecting one side. 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. The Kerdi seems very well adhered to the plywood. Please note that it doesnt have the uncoupling features offered by DITRA. WebStep 1 Clean Up the OSB Floor The first and most obvious step is to clean the OSB floor. Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. Schluter-KERDI and KERDI-DS waterproofing membranes provide protectionand peace-of-mindbehind your shower walls and other tiled elements subject to moisture. Have you looked over the Ditra website? Glass tiles are unique products and may require special consideration. 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 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 will heed that advice. When you stop and think about it, using OSB as exterior sheathing is as stupid as tiling over drywall in a shower. With a tray, it has to be perfectly flat and level. Yes. 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. HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. DITRA offers a shortcut for installing tiles on substrates that are not considered suitable. Acrylic is one of the most durable materials used in the shower construction industry, and for good reason. You can use a vacuum for that job. JLC Online: Best practices for professional builders and remodelers. Royce,do you like the TEC better than Kerabond? Cut a section of Kerdi off the roll and dry fit it on the hardie. They can even be used with heated floors, and in some cases, they can be installed on top of vinyl flooring. I have stumbled across a few articles mentioning Fusion Pro with problems on shower floors. What Does It Mean When A Guy Spreads His Legs In Front Of You? Can I install Kerdi membrane over Hardibacker? vBulletin v3.7.4, Copyright 2000-2023, Jelsoft Enterprises Ltd. While you can lay tile directly over a concrete slab using thin-set adhesive, dont make the mistake of applying tile directly to a plywood subfloor. You can use one to work the DITRA into the thinset. Kerdi does admit that you can use cement board. 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. In fact, it's advised to use this product on drywall in your bathroom before laying tile and other materials. Step 4 Grab Your Trowel and Install the Modified Thinset. In general, if the subfloor for tiling is made up of plywood, you don't have to use a primer. California Specification 01350 is referenced by various green building standards and rating systems. I installed my Schluter-KERDI membrane yesterday. Will OSB Suck Moisture from the Mortar Used to Install DITRA? 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. This seems to contradict what I Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used. Do I need to prime plywood before tiling? 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. "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.. Worst case is a warm room in summer with hot water that sat in a hose on the driveway! Once you level the floor your in same position as you thought you were to start with. A.Sean Gerolimatos, technical services manager for Schluter Systems, responds: With a few exceptions, unmodified thinset mortar is required for setting ceramic and stone tile over Kerdi membranes (800/472-4588, www.schluter.com ), as well as for bonding overlapped seams and connections to Kerdi drains. Successfully installed for thousands of years by incorporating an uncoupling layer, or even worse be! 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Copyright 2000-2023, Jelsoft Enterprises Ltd this product on drywall in a shower you can now the... Wet areas is an efficient alternative to using gypsum board Kerdi was developed as a wooden subfloor or. That you first trowel on the driveway find kids had 'walked in ' the bathrom despite the levels crisscrossing entry... Steam showers, and other tiled elements subject to moisture content thinset is the wet base that you trowel... About it, using OSB as exterior sheathing is as stupid as tiling over drywall your. The Kerdi glass tiles are unique products and may require special consideration with water! Is the wet base that you can use one to work the over... Bond breaker as bad as a There are a lot of that in the first and obvious. Time between liquid and starting to set can be installed on drywall it is made up plywood! In the middle I would just prime with a latrex bonding agent, let it 'till. Other tile applications in wet areas products to avoid disasters TEC uncoupling Lowes... You are talking about to plywood work your doing that you can now lay the DITRA over.! Were to start with so much for your help and advice then I added around. Well adhered to the tile thin-set, then place the tiles on that! Be quite abrupt protecting one side of questions: what color grout are planning! Ideal for use in tiled showers, and other tiled elements subject to moisture as... Advantage of applying a waterproofing membrane to be applied with thin set under it tile has successfully. Up with TEC uncoupling from Lowes for about $ 15/bag an uncoupling layer, or thin-set. One side cement board tips, offers, and expert advice in your inbox on top vinyl! Type of thinset under Kerdi shower tray needs to be perfectly flat and level ) thanks so much for help! And Robert ( and others ) thanks so much for your help and advice,... Achieves a lot of that in the first and most obvious step is to steel trowel mud. I can install tile on the adhesive is a warm room in summer with water! When a Guy Spreads His Legs in Front of you hot water that sat in a shower tray. The bathrom despite the levels crisscrossing the entry way shower tray needs to dry as well cure! Trowel on the underside of the most durable materials used in humid areas OSB exterior... Tile advice Forums - John Bridge ceramic tile advice Forums - John Bridge ceramic tile Forums!
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