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. Sloped Shower Tray KST1220/1525 - The Home Depot. Probably the simplest way is to caulk the gap with 100% silicone or a urethane sealant. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. This creates a strong, waterproof tile backer that also functions as an uncoupling membrane. Furthermore, if you're working in an older home KERDI-BOARD fits better than cement board in odd spaces. The gridlines printed on the surface are beneficial for the installation process, also allowing for quick, neat cuts with a utility knife. An additional layer of sealant can also be applied on the seams for extra protection and water resistance. Once this is done, continue the installation by following the directions for the particular Kerdi product being used. Make sure the floor is level in the shower. Houzz utilise des cookies et d'autres technologies de suivi similaires pour personnaliser mon exprience utilisateur, me proposer du contenu pertinent et amliorer ses produits et services. 173 upvotes. All shower/tub areas should have concrete board (I prefer hardiboard). Applying a conventional cement backer board to such a structure is almost impossible. This product is available in 3/16", 3/8", 1/2", 5/8" 3/4", 1" 1-1/2" and 2" thicknesses, allowing for a wide variety of installation options. That's the way us "Tile Guys" do it all the time. Then you can apply a thin layer of KERDI-FIX to the board, the membrane over top . Additionally, it is important to waterproof cement board before tiling, as the grout and tiles can help keep the board watertight. If I go the kerdi membrane route, do I still need to tape the joints before installing the kerdi membrane . I just a few weeks ago put kerdi on top of hardi-board in my shower and it was PAINFUL! Hardie board is thirsty, but that's way too fast. Once the membrane is in place, it can be sealed and reinforced with Kerdi-Fix sealant, Kerdi band, and Kerdi-Drain for added waterproofing strength. When I do another shower I'll use real cement board, not Hardi-board. 3. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'remodelormove_com-narrow-sky-1','ezslot_27',168,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-narrow-sky-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'remodelormove_com-narrow-sky-1','ezslot_28',168,'0','1'])};__ez_fad_position('div-gpt-ad-remodelormove_com-narrow-sky-1-0_1');.narrow-sky-1-multi-168{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:15px!important;margin-left:auto!important;margin-right:auto!important;margin-top:15px!important;max-width:100%!important;min-height:250px;min-width:250px;padding:0;text-align:center!important}Waterproofing should also be done on other areas in the shower as well such as the corners, window sills and other areas where water can easily accumulate. Sure, you can do it.just be sure to "spritz" or wet the hardi thoroughly before.it's pretty "thirsty.". The benefit of using kerdi is we can lay it over drywall, We've added a "Necessary cookies only" option to the cookie consent popup. Any recommendations? Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar must be used to construct all KERDI seams to ensure watertightperformance of the system. Look at it this way; Withe Kerdi, you either trust it or you don't. Putting this stuff on walls is difficult and time . This will help you achieve the best results and ensure the longevity of your project. I used to "trust" the Kerdi and drywall until I had a shower that the valve broke inside the wall cavity four years after being put in. Install the Schluter Kerdi membrane over the backer board using the correct mortar. This means that even if your waterproofing system leaks, the cement board will remain intact. Once the primer is completely dry, use a roller or brush to apply a coat of your chosen KERDI membrane adhesive over the entire surface of the wall, overlapping the edges slightly for full coverage. Since my guys and I will be doing this for the first time next week, I 'd like to take advantage of your 'learning curve.' It works well, is what Schluter recommends and I've never had an issue with it. #2. In order to determine which tile underlayment is right for your project, you need to know which issue youre trying to solve whether its preventing subfloor cracks from transferring to the tile, soundproofing, moisture protection, or providing more rigidity to the tile. Installation instructions vary depending on the type of Kerdi membrane being used, but typically the membrane is applied directly to a clean, dry plywood surface that is free from dust, dirt, and other debris. Additionally, the drywall should be primed with a latex primer before applying the Kerdi membrane. Regardless, cement board is a great, trusted tile substrate that will work well on both walls and floors. The tub flange can really be a pain in the butt when installing a tile tub surround. Cement board is typically used in wet areas, such as bathrooms and areas with a lot of moisture, because it is waterproof and provides a level of protection from water damage and long-term moisture exposure. x 96 in. Yes, Kerdi membrane can be installed over plywood. We store towels, medicine, toiletry supplies, first-aid gear, massage devices, facial steamers, spare Painting your garage is a great way to improve the look of the space and make the walls easier to clean. After installing your mud bed, make sure it is fully cured before applying Aquadefense. If you preorder a special airline meal (e.g. Building Panel: Price $ 119 00 $ 202 06 $ 279 00. ".1) is is okay to use kerdi board instead of ditra on the floor? Once the adhesive has been applied and has had time to properly cure, then the KERDI membrane can be applied to the wall. It is important to waterproof Hardie board to make it more water-resistant, as well as to protect the materials from the elements. Je peux rejeter les cookies non essentiels en cliquant sur Grer mes prfrences . I think it is engrained in me to do that so I forget to mention it. However, the answer you provided above suggests that the OP could omit a waterproof membrane, that I. Or will the Kerdi membrane (with seams taped with kerdi band) prevent each board from moving independently? Ceramic Tile Advice Forums - John Bridge Ceramic Tile, http://www.youtube.com/watch?v=G4HjHT6_cUo, http://www.youtube.com/watch?v=wEt6irjJCI0, My master suite addition & full bath to 1/2 bath renovation. Kerdi Board panels have a number of other advantages: they can be cut to size using an ordinary utility knife, can be glued or screwed into place, and are very lightweight. #3 This is a DIY site. On top of that, fiber cement board is even more brittle than standard cement board, so you have to be extra careful to keep screws at least an inch from the edge to avoid breaking the board. Cement board is a mineral-based board, usually 30 inches by 60 inches, that is used as a lower, dimensionally stable surface for installing ceramic tile, porcelain tile, or stonework. Cementboard sufficient to a tub surround is dirt cheap .vs. Schluter approves their waterproof Kerdi membrane over drywall. Waterproof showers are the trend today, so RedGard is an excellent alternative to cement boards that act as vapor barriers. Now there's nothing particularly wrong with fiber-cementit's just not my first choice. Various products can be used to waterproof shower walls such as water-resistant drywall and cement backer boards. Once its applied, the last step is to follow up the waterproof coating with a waterproof sealant. On the downside, the cement boards are heavy, somewhat difficult to cut and can leave abrasive sandy crumbs that can damage tubs and shower bases if youre not careful. This flexible polyethylene layer is easy to install and can protect the tile from both cracking and moisture. A square foot of half-inch thick cement board weighs roughly 40 ounces, while the equivalent area of a Wedi board weighs about 75% less. We also found that using a heavy rolling pin worked wonders for really setting the Kerdi. I circled one area, but there are lots of these edges." - Lisa Jasper The Kerdi band should be smooth and flat - not wavy/ "3) there is no membrane of waterproofing on the hardboard across from the "wet wall" after 5 1/2 feet up. Personnaliser mon exprience l'aide de cookies, Landscape Architects & Landscape Designers, Outdoor Lighting & Audio/Visual Specialists, epoxy or marine paint over greenboard for my shower walls (not tile), Need advice on bathroom remodel - using hardiebacker boards, HELP! In normal residential use I wouldn't worry about it. What to use to flatten and prep wall before installing Schluter Kerdi membrane for tiling? One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. I guess that why it was so frustrating that cement board is just sooo thirsty. Wedi showers feature a pre-sloped base that is already installed. When installing KERDI with unmodified thin-set mortar over particularly dry and porous substrates, it is recommended to wet the substrate first, in order to help prevent premature drying or skinning of the thin-set mortar. These multifunctional tile substrate and building panels are thus perfect for creating bonded waterproofing assemblies with tile coverings. When I tried to use the edge of my trowel [per schlutter video] I could see I was pulling a lot of the 'felt' off the backer. It is lightweight and made of expanded polystyrene. If so, that means breaking up the floor pan. The completed assembly takes the place of more traditional backer board when installed over 3/4-inch wood subfloors. The problem is on the back side of the drywall, which is not protected. The bag says Mapei floortile mortar, it was the only unmodified thinset at our hardware store. We ended up sponging the Hardi and wetting and booking the Kerdi (a la wallpaper), and that made the installation go much smoother. 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. RedGard can be applied to cement board panels in two ways: Roll it on the wall with a 3/4-inch nap roller or spray it on the wall. Once the wall is prepped, use a primer that is compatible with the KERDI membrane so that it will properly adhere to the wall. And for a more secure fit, you can also use screws. The big issue with cement board is that the thinset will skin over really quickly. In a perfect job, it will waterproof. Hardie board is a cement-based siding product that is water-resistant, but not waterproof. Cement board (cbu) is not waterproof, but is not damaged by being wet. Additionally, you can use KERDI-BAND around corners, seams, and joints to help with a waterproof installation. Cement board is particularly vulnerable to water damage, so waterproofing can help protect it and help it last longer. I want to mount a cast iron bathtub, but not pull down my 1905 plaster and lath. Too little, and the kerdi will never show you gray, no matter how you sweat. The site is called floorelf.com. Yes, you need waterproofing behind shower tile. About an argument in Famine, Affluence and Morality, Acidity of alcohols and basicity of amines. Yeah it seems that the only products that will be compatible with cement board and the kerdi membrane are bostik ditra-set and schluter all-set (or one of schluters other products). The manual can be found here: http://floorelf.com/waterproof, I would say unless you are experienced in working with Schluter-Kerdi waterproofing membrane kit, then I would say work with an easier waterproofing approach, either liquid waterproofing or a combination of liquid and traditional waterproofing (plastic covering the wood frame). I set the Kerdi with my hands, pat it into the thinset with my hands, then go over it with a 4" taping knife held at a low angle to embed the Kerdi in the thinset. As such, many homeowners and professionals find themselves wondering whether Kerdi Board or cement board is the better tile substrate. Following the correct application of Kerdi membrane over cement board will ensure a successful waterproofing installation and lasting results for your tile project. Find the website that's made specifically for you. Spacers are the next step. Also are you saying that you wet ("booking the Kerdi") the Kerdi, as well? Waterproofing cement board is relatively simple and there are several different waterproofing products available. We are DIYers who have already remodeled one bathroom successfully, but this is our first time using The Schluter shower system. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. We think it is the cement board (Durock) sucking the moisture out of the unmodified thinset. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. x 48 in. 4. You can apply it on PVC, metal, slabs, walls, and floors. PROBLEM SOLVED for Tub Flange when Installing Cement Board and Tile. you should still water proof with a liquid membrane product like RedGuard. Kerdi board, on the other hand, is an extruded polystyrene foam panel. The best answers are voted up and rise to the top, Not the answer you're looking for? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I hang Kerdi on cement board and fibercement board all the time. A hundred times better to have too much before you comb than too little. That means that you do not have to rely on a surface membrane or worry about the board failing if the core is exposed to water. A 1/2-inch thick, 3 x 5 foot sheet weighs just 7-1/2 pounds, compared with 45 pounds for a similar size sheet of cement board. see Prop 65 WARNINGS.

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