kerdi membrane over cement board

that's home depot homeowner installation method. The tub flange can really be a pain in the butt when installing a tile tub surround. Kerdi is not a user friendly product, and when you shrink your working time down it is downright stressful. The Schlter system tends to be more durable than a cement board, but it also depends on the particular application and the weather. . KERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. Drywall under Kerdi would have been a better choice. We sponge water onto the cement board. Waterproof showers are the trend today, so RedGard is an excellent alternative to cement boards that act as vapor barriers. Following the correct application of Kerdi membrane over cement board will ensure a successful waterproofing installation and lasting results for your tile project. Start by cleaning the cement board with a mineral oil soap; this will help reduce mold and mildew growth throughout the life of 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. When it comes to tile underlayment, your options can be categorized into three main classifications, each suitable for different tiling circumstances: Although cement board is the most commonly used underlayment for tile, Kerdi board is growing in popularity as a multifunctional tile substrate. Can you put KERDI over regular drywall? - remodelormove.com It is important to overlap the edge of the membrane so that it covers slightly more than half of the drywall behind it. It's a lightweight polystyrene board faced with Kerdi that comes in various thicknesses that you can use in place of drywall or cement board. Ditra is a 1/8-inch thick polyethylene membrane with a layer of anchoring fleece on the underside and a grid of square cavities on top. When installing Schluter Kerdi Membrane over cement backerboard: Should I use Alkali Resistant Mesh Tape and thinset on the seams of the backer board (for long term durability to prevent each board moving independently thus preventing cracking) prior to installing the Kerdi membrane. And for a more secure fit, you can also use screws. When installed, Kerdi Board creates a substrate that is level, flat, square, plumb, and dimensionally stable. Because it can let some moisture wick through it, you have two choices: put a moisture barrier behind it to protect the structure, or, waterproof the front of it. There is no cutting or fitting of boards, and a mortar bed is good for leveling and flattening uneven or out-of-level floors, which are common in old houses. We were using a 3/16 x 5/32 trowel, probably to small. Not everyone knows how to do mud and lathe it's so old school plus it wears you out, ive been a setter for 27 yrs and I have yet to go back to one of my showers I installed using perma base or durock, with a liner, i have started using waterproofing such as redguard or aqua-defense. Kerdi does admit that you can use cement board. Porcelain and ceramic tiles are stiff and hard materials, so if they are installed on an unlevel or bouncy surface they are highly susceptible to cracking. Cut the Kerdi membrane to size using a utility knife or scissors. The main issue caused by non-waterproof cement boards is the eventual warping and damage to the tiles, making it difficult and costly to fix without removing all the tile and starting over. As such, many homeowners and professionals find themselves wondering whether Kerdi Board or cement board is the better tile substrate. Sheets of glass mat gypsum are made from water-resistant silicone-treated gypsum, reinforced on both sides by fiberglass mats. Additionally, the drywall should be primed with a latex primer before applying the Kerdi membrane. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Using cement board and a sheet membrane . But that doesn't address your question, so it's just a comment, not an answer as such. Yes, Hardie board needs to be waterproofed. Probably the simplest way is to caulk the gap with 100% silicone or a urethane sealant. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? The cement board needs to be clean, free of debris, and dry. That would tell him where the edge of the framing needs to be. If you want added info there's an old Kerdi thread here. Prime first to create a flat, uniform surface that is free of dust, grease and other debris. There are many different types of underlayment to choose from, but they all serve the same purpose. That's the way us "Tile Guys" do it all the time. How should I transition between cement board floor and alcove tub? I hope you made the guy flood test his work prior to tiling the shower floor. Kerdi Questions and Answers - Kennedy Kitchens & Baths Blocking should be constant across this area when openings are larger than your fist. To put things into perspective, consider that a tile floor is made up of three layers: the subfloor, the underlayment, and the tile surface you walk on. Since the existing wall board will be removed, I'd prefer to go a little extra and install a water proof cement board type base so the tile has a solid substrate even if it were to get wet, such as from a plumbing leak, or from infiltration on an exterior wall (as unlikely as that might be). They are available in thicknesses of 3/16, 3/8, 1/2, 3/4, 1, 1-1/2, and 2 (5, 9, 12.5, 19, 25, 38, and 50 mm). Sweeby-Can you clarify- I undestood that the thinset would tend to dry out from the thirsty hardi or skim over from the air; so how does booking the Kerdi help with the first? First, its super lightweight compared with the rest. Preparing drywall for KERDI membrane requires a few important steps to ensure a successful application. Kerdi board, on the other hand, is an extruded polystyrene foam panel. In jobsite conditions and over a long time, who knows. Overall, waterproofing behind and around shower tile is a critical part of any installation to ensure that the area is adequately protected from water and moisture damage. FRC board tends to be more moisture-resistant than gypsum board and is best suited for outdoor projects such as showers or tub surrounds. Additionally, you can use KERDI-BAND around corners, seams, and joints to help with a waterproof installation. Needless to say, the drywall turned to mush. However if installed on drywall it is only protecting one side. If he did the framing for the shower, then in order to measure for it correctly, he would need to know how thick the tile is so that he can avoid exactly this problem. To properly seal a cement board for a shower, its important to first properly prepare the surface. Kerdi Membrane Over Greenboard (Is It Recommended?) Cut the shower tray to size. Go with smaller bags or only mix half. En cliquant sur Accepter , j'accepte l'utilisation des cookies telle qu'elle est dcrite plus en dtail dans la Politique d'Utilisation des Cookies de Houzz. The niche' intermediate shelf isn't actually attached, to enable specific placement for each unique tiling application. Tile Backer Board Breakdown - DIYTileGuy The major drawback to cement boards is their weight, as they are incredibly heavy and can be difficult to cut. When applying Kerdi membrane to cement board, the edges and seams of the membrane must be lapped, meaning that each layer should overlap the portion underneath it by a minimum of two inches. #3 This is a DIY site. If cement board had been used, most likely the damage would have been much less that what I have to deal with now. The thin-set mortar should be mixed to a fairly dry consistency and then spread on the surface with a 1/4 inch square notch trowel. This means that even if your waterproofing system leaks, the cement board will remain intact. When applying the thin-set, it should be applied in such a way that it fully fills any empty space between the Tile and Schluter product and is solid enough to support the weight of the tiles being installed. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. rev2023.3.3.43278. Given the complexity, its easy to see why even experienced tile setters avoid dry-pack mortar and use backer board instead when they can. Can I put Kerdi board over drywall? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. One of the company says they are going to apply kerdi membrane on the drywall, then tiles onto the kerdi membrane, and as such as cement backboard would not be required. Will use the Schluter Shower system. . To create a watertight shower assembly, we installed Schluter's Kerdi membrane over the drywall, just as we would for tile.Write by:. Putting this stuff on walls is difficult and time . The big issue with cement board is that the thinset will skin over really quickly. No, you do not need to install a vapor barrier, as Kerdi Board is the vapor barrier. When applying the primer, make sure to cover all surfaces thoroughly, as these will be completely covered by the KERDI membrane. If you choose to use Aquadefense as a shower pan liner, be sure to continue it up the walls at least 6", tying into your waterproofing on the walls. there should be a small gap between the backer board and the tub. ".1) is is okay to use kerdi board instead of ditra on the floor? Will use the Schluter Shower system. We are DIYers who have already remodeled one bathroom successfully, but this is our first time using The Schluter shower system. All shower/tub areas should have concrete board (I prefer hardiboard). Kerdi 3 ft. 3 in. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. Kerdi Membrane not sticking to cement board - John Bridge Step 2: Determine the room's center. How to follow the signal when reading the schematic? Or will the Kerdi membrane (with seams taped with kerdi band) prevent each board from moving independently? Ideally the DalSeal TS would fold into the gap between the wall and ceiling concrete board. Can you put Kerdi membrane over cement board? Hardi is definitely a "thirsty" substrate but will work, even without a primer of RedGard. Yes, it is recommended to waterproof cement board, especially if it is going to be used in exterior settings or in places where it will be in contact with water. Fiber cement board is a variation of cement board that is made from compressed cement and sand and reinforced with wood fibers throughout. Water-resistant gypsum board, or green board, was used in the past as a tile backer but is no longer recommended, mainly because better products are available. Yes, it is possible to put Kerdi over regular drywall. ps, now that you don't need it anymore you can throw that useless cheap piece of crap magnesium float my way. For indoor projects and gypsum board, thinset with a latex acrylic modifier is ideal. No, that doesn't sound right. The cement board core itself is not waterproof, but it can withstand water without falling apart. The site is called floorelf.com. Do I have to use Kerdi tape with Ditra membrane? Please feel free to reach out to our Product Support Team at 1-800-992-6273 if you need anything. Schulter Ditra is manufactured by Schluter Systems and is a 1/8 thick polyethylene uncoupling membrane that is specifically designed for tile installations. Another advantage is that the polyisocyanurate core of foam boards is waterproof. Finally, make sure to select a thinset that is appropriate for the job, check the manufacturers recommendation, and always follow the instructions on the product label. But a mortar bed does have advantages. You are wise to use a cement board. How do I align things in the following tabular environment? Step 3: Apply Thinset. We also found that using a heavy rolling pin worked wonders for really setting the Kerdi. 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. The most important thing to remember when applying the membrane over the cement board is to make sure the surface is clean and free of any debris, dust or other contaminants. Hardie board is thirsty, but that's way too fast. After roughly two days I would fill the corner with silicone. Kerdi vs Redguard cost breakdown. : r/HomeImprovement - reddit This liquid waterproofing solution does more than keep water away, it also promotes tile adhesion and prevents cracking. Glass mat gypsum board is a better choice. This will prevent water from entering from behind the membrane, and will provide a more secure waterproof layer. x 5-ft. and 3 x 5-ft. sheets of cement board are sized for efficient use around bathtubs and showers. Slap it up comb it out, leave every ridge tall and perfect. See the foam bench and the corners. To learn more, see our tips on writing great answers. Why are physically impossible and logically impossible concepts considered separate in terms of probability?

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