Using modified thinset on KERDI can be tricky and in some cases, it can cause issues. Since KERDI is impervious, it does not deprive the mortar of its moisture. Significantly more time and effort is required to ensure a quality bond when using a modified thinset adhesive with KERDI, and for this reason, it is usually not recommended. Underlayment is designed to smooth out uneven areas of the subfloor and form a rigid layer that prevents the flooring from bending. To line niche shelves, for instance. Sledge hammers for the floor, that might take a bit of time. For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc. This will prevent water from entering from behind the membrane, and will provide a more secure waterproof layer. Retired Moderator - Theatre Guy (and computers). Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. Caulk the gap. Your Get free, zero-commitment quotes from pro contractors near you. 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. 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. Sheets of glass mat gypsum are made from water-resistant silicone-treated gypsum, reinforced on both sides by fiberglass mats. By: Author Olin Wade (Remodel or Move Stuff). Creative, C'mon over for a beer! Unlike cement boards, you can bend this material without it breaking. 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. This allows for future compression and an area at the corner where things are more forgiving. 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. And second, since its foam, the board is super easy to cut with just a utility knife. I appreciate your help and your quick response. Kerdi is not a user friendly product, and when you shrink your working time down it is downright stressful. . FRC board tends to be more moisture-resistant than gypsum board and is best suited for outdoor projects such as showers or tub surrounds. Regardless, cement board is a great, trusted tile substrate that will work well on both walls and floors. That was not a fault of the Kerdi, or the installation. You just need a hammer and wonderbar for the walls. Also, apply the acrylic mastic between the Create curved designs around pipes or columns using the vertically-grooved KERDI-BOARD-V, or use L-shaped KERDI-BOARD-E panels to enclose similar. Yes, KERDI membrane will stick to cement board. Your email address will not be published. Putting this stuff on walls is difficult and time . Using Kolmogorov complexity to measure difficulty of problems? Schluter Kerdi-Shower-T/-TS/-TT 48 in. Here are the fundamentals of tile installation over cement board. After roughly two days I would fill the corner with silicone. Kerdi, a waterproofing membrane made of a special polyethylene fabric, should be allowed to completely dry prior to tiling. What do you mean it doesn't adhere? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. rev2023.3.3.43278. Step 3: Apply Thinset. It is a pliable waterproofing membrane that also doubles as a vapor retarder. I don't want to use the Ditra membrane product but rather tiles directly over the cement boards. One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. 1. Any competent tile contractor would float the wall in mortar giving you a stronger, level, perfectly flat, and square surface to properly install tile. The cement board needs to be clean, free of debris, and dry. There is a product called Kerdiboard you might want to look into. When it comes to applying KERDI, however, it is advised to use a regular thinset that includes portland cement as its main component. Make sure the floor is level in the shower. Cut the Kerdi membrane to size using a utility knife or scissors. Shouldn't take too long, maybe an hour or so. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. builder, anti-builder, rebuilder -- Retired Moderator. This will ensure a strong bond between the KERDI membrane and the substrate. Kerdi membrane is a waterproofing material that is designed to be used in wet areas such as bathrooms and showers before tiles are installed. Waterproofing cement board is relatively simple and there are several different waterproofing products available. He would take his rough opening measurement and subtract the thicknesses of the tile, the cement board, and in his unique install method the purpleboard. How do I align things in the following tabular environment? The major drawback to cement boards is their weight, as they are incredibly heavy and can be difficult to cut. New England. 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. Is this overkill? It costs more but it;s worth it for the ease of install IMO. We are no longer supporting IE (Internet Explorer), Do not Sell or Share My Personal Information. First, it's super lightweight compared with the rest. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. 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. When installed, Kerdi Board creates a substrate that is level, flat, square, plumb, and dimensionally stable. We tried soaking the cement board and applying the kerdi in small sections. The tub flange can really be a pain in the butt when installing a tile tub surround. . Once the adhesive has been applied and has had time to properly cure, then the KERDI membrane can be applied to the wall. For the floor I make a dry mix mud base and then the Kerdi membrane. Learn more about Stack Overflow the company, and our products. Run a damp towel over the cement board surface to dust . When applying thin-set mortar, the manufacturers instructions should be followed closely. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. Bathroom closets are often catch-alls for anything and everything remotely related to self-care. But I did want to understand the cost breakdown as the walls then become WAY more expensive than it would be with Redguard. Politique d'Utilisation des Cookies de Houzz. Why do you think each board should be able to move at all let alone independently? Cement board and grout are not water proof, if there's Kerdi no moisture is ever going to be able to get behind it. #1 - Backer board has nothing to do with HD or any other big box. The great thing about Kerdi Board is that it is lightweight and easier to maneuver. Ultimately, the decision between a Schlter system or a cement board comes down to the particular application and the goals the user has for the floor system. This thread is 9 years old and it's the Hardi board that's thirsty not the Kerdi. Contact us: 888-472-4588 Removing bathroom tile from cement backerboard, Transition from KERDI membrane backed, to not backed. The best answers are voted up and rise to the top, Not the answer you're looking for? As far as the tile/prep work, you are right that he is shifting the blame. Putting this stuff on walls is difficult and time . The boards come in three-foot by five-foot and four-foot by eight-foot panels, sized for efficient use in bathrooms. Thanks to Mongo's earlier post, we knew we'd have to spritz the Hardi -- but found that even that wasn't quite enough. In jobsite conditions and over a long time, who knows. It looks like Kerdi membrane is ~$2/sqft ($200 for a 108sqft roll) and kerdi board is $3.7/sqft ($115 for a 4x8 sheet (Lowes)). Needless to say, the drywall turned to mush. Kerdi does admit that you can use cement board. Following the instructions for the product being used and ensuring that all of the necessary steps are followed will help to ensure a successful installation. Too little, and the kerdi will never show you gray, no matter how you sweat. An additional layer of sealant can also be applied on the seams for extra protection and water resistance. Furthermore, if another trade, such as the shower glass installers, makes a mistake then you'll be . Foam-core tile backing board has two big advantages over other backer boards. Backerboard plus a waterproofing membrane like Redgard is all that is needed for tub surrounds with thinset then tile. Ceramic and porcelain tile, more than almost any other surface material, need a stable . Also - use a good thinset. When it comes to selecting thinset for cement board, there are a few important factors to consider. So long as the seams and joint areas are properly prepared, the panels can also provide waterproofing. Schluter-KERDI is a pliable, sheet-applied, bonded waterproof membrane and vapor retarder with limited crack-bridging capabilities. In the worst case, it's OK to cut the Kerdi, remove the damaged section, scrape up the thinset from the areas, and set a new piece of Kerdi. I have to redo my tub surround due to moisture leaks and failing grout. Preparing drywall for KERDI membrane requires a few important steps to ensure a successful application. If you do not already have the hardi up, I recommend using real cement board (Hardi is a fiber-cement) or drywall. What to use to flatten and prep wall before installing Schluter Kerdi membrane for tiling? RedGard, on the other hand, is a liquid waterproofing membrane made by Custom Building Products. Project Type: Tile / Category: Bathroom. Then you can apply a thin layer of KERDI-FIX to the board, the membrane over top . However if installed on drywall it is only protecting one side. Blocking should be constant across this area when openings are larger than your fist. Builder saying he doesn't want to put my trim tile in here. Installation. I'm guessing he put a 2x6 across for the curb? Your real issues are the lack of proper corners on this shower. If done according to manufacturers instructions, it will seal nicely. 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. Allow the adhesive to cure for the amount of time recommended by the adhesives manufacturer.

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