After today's tutorial, you'll gain the confidence to transform your old bathroom into a new space. While cement board and grout are not waterproof, Kerdi is and can even be directly installed over drywall. Applying a conventional cement backer board to such a structure is almost impossible. Seems like I've been using the full measure of water the bag calls for, plus about 10%.-50 lbs of thinset at a time is too much for an amatuer. How long should I wait after painting on the Redgard before I try to reapply the membrane? Additionally, seal the space around any pipes and fixtures that can be found in the shower. It is a fast process that is hard to mess up if you do it right. I like to use a garden sprayer to keep the thirsty Kerdi wet. The colour is different. When applying the primer, make sure to cover all surfaces thoroughly, as these will be completely covered by the KERDI membrane. The use of modified thinset adhesive could result in an inadequate bond and could lead to possible delamination. 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. 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. Dean, our tile consultant, says glass mat backer board is his first choice due to the ease of installation, cost, and because his workers like it. Using Kolmogorov complexity to measure difficulty of problems? if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'remodelormove_com-mobile-leaderboard-2','ezslot_25',167,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-mobile-leaderboard-2-0');Waterproofing should be done prior to the installation of any tile including behind the shower tile. The problem is on the back side of the drywall, which is not protected. What was the indicator that let you know that spritzing was not enough, and that you needed to 'sponge' the Hardi? They are designed to provide a waterproof, vapor-tight layer to the substrate, which in this case would be the cement board. 1. We tried adding water to the thinset, we tried . With so many different types of underlayment to choose from, it can be hard to decide which is best for your project. It's not a matter of trusting the Kerdi. Then cement, sand and water are mixed together to a crumbly consistency and floated over the lath to form a flat surface. I'm thirsty. 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. How do I connect these two faces together? I guess that why it was so frustrating that cement board is just sooo thirsty. Once all areas have been properly waterproofed, the walls can be tiled and grouted to create a waterproof surface. Once you have determined the type of thinset, its important to also consider the weather conditions during installation. If a pipe or faucet ever leaks in the wall this will ruin your shower. Both may be effective substrates, but Kerdi Board boasts significant advantages. Contact us: 888-472-4588 is that because water doesn't really hit that area?" - Lisa Jasper That's pushing it but should be fine. Sheets of glass mat gypsum are made from water-resistant silicone-treated gypsum, reinforced on both sides by fiberglass mats. Installation is simple- just trowel a layer of thin-set adhesive on the floor and embed the mat in it, then fill the cavities with thin-set. This flexible polyethylene layer is easy to install and can protect the tile from both cracking and moisture. However if installed on drywall it is only protecting one side. Hardie board is a cement-based siding product that is water-resistant, but not waterproof. The drywall's back side fails, and it's just as bad or worse than it was on the tile side. This creates a strong, waterproof tile backer that also functions as an uncoupling membrane. The grid lines on the surface are incredibly helpful for installation and making neat cuts. If you want to go to the extra effort of putting the membrane over drywall, there is no need to use greenboard. 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. It costs more but it;s worth it for the ease of install IMO. It is also essential that cement board joints and fasteners be sealed and waterproofed with the Kerdi Fix sealant to help prevent water from leaking into the wall and floor cavities. Kerdi Board is expensive, but I can justify it because it saves time, and it's a joy to use. I always install it over cement board or backerboard, never over drywall, even blueboard or the mold resistant greenboard. Hang the cement boar. Connect and share knowledge within a single location that is structured and easy to search. If you want added info there's an old Kerdi thread here. But that doesn't address your question, so it's just a comment, not an answer as such. This makes Kerdi Board suitable for a wide variety of interior applications, including kitchen countertops. This feature makes building the base structure much easier and more cost . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. After priming, use an approved adhesive to adhere the KERDI membrane to the drywall, making sure the edges are well sealed and joints are tight.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'remodelormove_com-medrectangle-4','ezslot_12',156,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-medrectangle-4-0'); A successful installation of KERDI requires well-prepared surfaces and a proper application, so take the time to properly prime the drywall before installation. . 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. Cement board (cbu) is not waterproof, but is not damaged by being wet. If any is found, wait a few more hours and then re-inspect. Step 4: Place the Tile. ".1) is is okay to use kerdi board instead of ditra on the floor? I usually use Durock. Thanks. Think about movement. #1 - Backer board has nothing to do with HD or any other big box. 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. If so, that means breaking up the floor pan. Waterproofing cement board is relatively simple and there are several different waterproofing products available. When installed, Kerdi Board creates a substrate that is level, flat, square, plumb, and dimensionally stable. Yes, Schluter membranes can go over cement board. I also used a larger sized trowel than the one recommend by Schluter. Why does the plumbing rough need to be moved? If you can paint a wall, you can use RedGard. To properly seal a cement board for a shower, its important to first properly prepare the surface. Additionally, the use of modified thinset with KERDI could lead to cracks and other issues down the line as the modified thinset can shrink and pull away from the KERDI membrane over time. Sure, you can do it.just be sure to "spritz" or wet the hardi thoroughly before.it's pretty "thirsty.". Greenboard is the same as regular drywall. if you go with vapour barrier, then cement board. As far as the tile/prep work, you are right that he is shifting the blame. Yup! The gridlines printed on the surface are beneficial for the installation process, also allowing for quick, neat cuts with a utility knife. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. When cleaning thinset off of Schluter membranes, the manufacturer recommends using a wet sponge and taking care to avoid any scoring or inconsistencies on the surface of the membrane. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Whether youre installing tile on a floor, wall, or countertop, choosing the right type of substrate, or underlayment, is critical to preventing breaks and cracks in both the tile and the grout. Thanks for contributing an answer to Home Improvement Stack Exchange! Following the correct application of Kerdi membrane over cement board will ensure a successful waterproofing installation and lasting results for your tile project. 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. These multifunctional tile substrate and building panels are thus perfect for creating bonded waterproofing assemblies with tile coverings. DIYers on this forum seem to have nothing but problems with Hardi. Je peux rejeter les cookies non essentiels en cliquant sur Grer mes prfrences . Jessica considers herself a home improvement and design enthusiast. The 1/4-inch-thick board is typically used on floors and countertops. Kerdi can even be installed over drywall. Your air bubbles will travel along the valleys you've made, and it's way better if you only have to move them 20 inches to the nearest edge rather than all the way from the ceiling to the floor [Again, Mongo can, but he has mad skills].-Not paying attention to the principle of bedding top down, center out. Is a PhD visitor considered as a visiting scholar? We are still most comfortable with full plumber's pan over the curb, including glue-on preformed corners, and also a second layer (usually Kerdi but can be paint-on) on top of CBU wrap over curb. I have watched it done 10-15 times, have good skills, and if I tried to make large mortar walls myself it might like a little kid threw up concrete Should I use Kerdi membrane or cement backerboard? In normal residential use I wouldn't worry about it. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. I simply sponge off the excess. The cement board needs to be clean, free of debris, and dry. This will prevent water from entering from behind the membrane, and will provide a more secure waterproof layer. This will help you achieve the best results and ensure the longevity of your project. Regardless, cement board is a great, trusted tile substrate that will work well on both walls and floors. The niche' intermediate shelf isn't actually attached, to enable specific placement for each unique tiling application. WATCH HERE: https://www.youtube.com/watch?v=3TRLd2HYhbU&list=PLO47JMsdYGrkxM_ZkOc3lMnsVhTqj80bB#justdoityourself #lovingit #p. All shower/tub areas should have concrete board (I prefer hardiboard). Cut the Kerdi membrane to size using a utility knife or scissors. Learn about the options in exterior siding before you choose, Before you pick up a single tile, pull from these tips for expert results, Slip resistance, curves and even the mineral content of your water all affect which tile is best for your shower, We help a Houzz user ask all the right questions for designing a stylish, practical and safe shower bench, This isn't a light DIY project: You'll need heavy-duty tools and plenty of protection for your home and yourself, In steamy quarters, tile needs to stand up to all that water and vapor in style. A lot of folks like using cement board but it's heavy and requires a waterproofing membrane over it. Step 6: Choosing the Next Tile. Thanks Paul! Since KERDI is impervious, it does not deprive the mortar of its moisture. GoBoard is a kind of backer board because the main elements of a backer board are cement, silica, fiberglass, etc. My idea is to block in and install the tub in the existing corner, erect the new wet wall, and use hardi-backer to shim the wall out over the tub flange, then apply kerdi over the whole thing.Does kerdi take offense at being installed over hardi? It is a topical waterproofing layer that is put over the substrate to keep water from getting to the wood frame and nails.

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