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Out of curiosity, why are any of you suggesting backerboard at all? I simply sponge off the excess. Shouldn't take too long, maybe an hour or so. When screwed to the framing, thin strips of cement board fracture more easily than thin strips of fiber-cement. see Prop 65 WARNINGS. This thread is 9 years old and it's the Hardi board that's thirsty not the Kerdi. The core isnt waterproof, but it can withstand getting wet without falling apart, so even if your waterproofing system leaks, the board will stay intact. You're correct if you use the shluter kerdi membrane you do not use a vapour barrier since it creates a sandwhich effect that doesn't allow the substrate . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. is the contractor creating a waterproof schluter-kerdi shower? Cement boards are typically capable of withstanding larger amounts of water, while a Schlter system is designed to hold up well only in dry conditions. Make sure the floor is level in the shower. This is a bit difficult to answer as it depends on the particular application for the floor system. KERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. 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. Using self-leveling underlayment takes careful prep work. That would tell him where the edge of the framing needs to be. This will include installing its components, such as drain plate and drain collar, as well as Kerdi Band for further protection of seams and corners. 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. An extra layer of thinset is then added to the surface of the cement board to adhere the tiles in place. The perfect fold is tricky and many of my first steam showers where built without the sealed slip joint. The colour is different. Sloped Shower Tray KST1220/1525 - The Home Depot. One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. Been clankin' away at this computer for a couple of hours now, guys. 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. It only takes a minute to sign up. It is designed to form a waterproof layer between cement board and tiles, helping create a watertight installation. It works well, is what Schluter recommends and I've never had an issue with it. Ready to join the 100,000+ homeowners matched with pros? We ended up sponging the Hardi and wetting and booking the Kerdi (a la wallpaper), and that made the installation go much smoother. As a contractor, I have been using Kerdi since it came out. ), Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar is recommended. Personally, I like standard drywall. I can take a bit of it off the wall and roll it into a ball. 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. When installed, Kerdi Board creates a substrate that is level, flat, square, plumb, and dimensionally stable. And by 'booking the Kerdi' I mean we put it in the bathtub, sprayed it with the handshower, then booked it (just like wallpaper). DensShield is one common brand. I hope you made the guy flood test his work prior to tiling the shower floor. We tried adding water to the thinset, we tried . Welcome to the site. A successful tile installation largely depends on the substrate that the tile is attached to. Installation. Asking for help, clarification, or responding to other answers. First, its super lightweight compared with the rest. Without an underlayment, even the slightest movement of the subfloor can result in cracking of the tile and crumbling of the grout lines. The use of modified thinset adhesive could result in an inadequate bond and could lead to possible delamination. Keep in mind that most tile setters err on the side of caution and brush a waterproofing membrane on top of cement board when it is in wet areas like showers or tub surrounds. Ceramic and porcelain tile, more than almost any other surface material, need a stable . Or will the Kerdi membrane (with seams taped with kerdi band) prevent each board from moving independently? 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. 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. If you are looking for a way to minimize height buildup and eliminate a large level difference at thresholds, a mat product is a good solution. I also used the Kerdi drain. Waterproofing cement board is relatively simple and there are several different waterproofing products available. But I can't give you a +1 because telling someone to mortar all the walls in a large shower is like telling them to make an ice sculpture. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. @JimmyFix-it - hardiboard is not really porous unless it is completely saturated. 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. It only takes a minute to sign up. Kerdi Board is suitable for a number of interior applications. The great thing about Kerdi Board is that it is lightweight and easier to maneuver. 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. Continuing Education for Architects & Designers. 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. If there is no blocking behind the seam, i would just tape prior to installing the membrane, the thinset will fill the seam and embed the mesh. Cement board is the industry standard when it comes to tile substrates and the most preferred among professionals when installing porcelain or ceramic tile. Cement board is a heavy mess compared to drywall, and drywall is a heavy mess compared to Kerdi Board. Once the wall is prepped, use a primer that is compatible with the KERDI membrane so that it will properly adhere to the wall. Re: Kerdi on shower curbs. 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. Installing cement board involves placing the boards atop a layer of thinset adhesive, a process known as bedding. Problem with very thick cement board/ tile/bullnose edge, Steam Shower Slip Joint Detail - The secret is in the boarding stage. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Do the prefab Schluter niches like the double unit 12 by 28shelf have a built in pitch to the bottom and middle shelves to drainoff water as shown in niche that you built in that thread? Contact us: 888-472-4588 Kerdi Board is expensive, but I can justify it because it saves time, and it's a joy to use. The shower is ready for tile. When I tried putting up the first sheets, which were only 36" x 39", and even though I had SOAKED the hardi, to the point water was pooling on the floor, the thinset was already drying before I got the Kerdi up, and I couldn't get it to adhere properly no matter how hard I tried. Ideally the DalSeal TS would fold into the gap between the wall and ceiling concrete board. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'remodelormove_com-large-mobile-banner-1','ezslot_17',164,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-large-mobile-banner-1-0');As an added precaution, you may want to consider to adding a water-resistant layer afterwards, such as a caulking or flashing tape. Retired Moderator - Theatre Guy (and computers). Building Panel: Price $ 119 00 $ 202 06 $ 279 00. Mike Holmes uses backer on his show. . This is confusing since Kerdi Board has no Kerdi on it. Yes, Kerdi membrane can be installed over plywood. In general, modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. On a vertical surface, very little moisture . I have used kerdi, and I have applied it over cement board. Step 2: Determine the room's center. First Kerdi can be installed on drywall or cement board. Yes, you should prime drywall before installing KERDI in order to ensure proper adhesion and a successful installation. 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. Thinset with a latex acrylic modifier is best for interior projects, but if youre installing outdoors, you should use thinset with a polymer modified (PM) compound for greater moisture resistance. Yes. I guess I could save a few $ and laminate 1/4" drywall there instead.IOW, is hardi OK to level out the tub flange?Not that it matters, but the tile will be 3x6 carrara to the ceiling.Casey. Cement board is the most common and widely-known backer board. ps, now that you don't need it anymore you can throw that useless cheap piece of crap magnesium float my way. . To line niche shelves, for instance. In a perfect job, it will waterproof. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'remodelormove_com-box-3','ezslot_2',173,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-box-3-0');Yes, you can put Kerdi membrane over cement board. It fell right off? Kerdi-Board panels allow the installer to prepare and create a broad range . Good luck with your project. To create a watertight shower assembly, we installed Schluter's Kerdi membrane over the drywall, just as we would for tile.Write by:. 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. Hi David. modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane.
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