When I do another shower I'll use real cement board, not Hardi-board. Hardie board is a cement-based siding product that is water-resistant, but not waterproof. 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. Run a damp towel over the cement board surface to dust . I would get someone else. Politique d'Utilisation des Cookies de Houzz. The waterproof membrane isn't a substitute for the substrate. 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. And second, since its foam, the board is super easy to cut with just a utility knife. 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. Once all that is completed and the Aquadefense has dried, you can install your tile with a polymer modified mortar meeting the ANSI requirements of A118.4 or A118.11. We tried adding water to the thinset, we tried . Your Get free, zero-commitment quotes from pro contractors near you. They can be installed on any type of support and can even be used to create partitions, with no structural support required. The perfect fold is tricky and many of my first steam showers where built without the sealed slip joint. This makes Kerdi Board suitable for a wide variety of interior applications, including kitchen countertops. To create a watertight shower assembly, we installed Schluter's Kerdi membrane over the drywall, just as we would for tile.Write by:. It costs more but it;s worth it for the ease of install IMO. I think I'll try using the thinned mixture of Redgard and then try the Kerdi membrane again. Kerdi board is a kind of waterproofer because these kinds of boards are made of XPS foam. Once its applied, the last step is to follow up the waterproof coating with a waterproof sealant. Can I put Kerdi board over drywall? Why do small African island nations perform better than African continental nations, considering democracy and human development? We think it is the cement board (Durock) sucking the moisture out of the unmodified thinset. Not even the plumber's fault as it was just a bad valve. Yes, KERDI membrane will stick to cement board. The completed assembly takes the place of more traditional backer board when installed over 3/4-inch wood subfloors. I hope you made the guy flood test his work prior to tiling the shower floor. Kerdi does admit that you can use cement board. @DMoore- OK, I agree that with redguard it would be redundant. 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. I used this to seal a 3 1/2 by 6 1/2 foot shower with 7 foot walls. Learn more about Stack Overflow the company, and our products. In a perfect job, it will waterproof. This liquid waterproofing solution does more than keep water away, it also promotes tile adhesion and prevents cracking. Putting this stuff on walls is difficult and time . Its essential to protect surrounding wall and floor surfaces from water or moisture damage that can occur in these areas. The problem is on the back side of the drywall, which is not protected. Unlike cement boards, you can bend this material without it breaking. #4 You could be adding a good 1000 pounds to your install too. It works well, is what Schluter recommends and I've never had an issue with it. 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. Make sure the floor is level in the shower. 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. 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. "..2) the kerdi band isn't stuck flat -- the edges in some spots are wavy. If you want a cement board, use Durock or Wonderboard. And second, since it's foam, the board is super easy to cut with just a utility knife. Answer (1 of 3): Schluter recommends applying Kerdi over drywall for walls, however, my local building code will not permit this practice - the local building code requires cement backer on the walls of a shower enclosure, therefore, I have done this successfully many times. Modified thinset adhesive is a premixed product that contains latex or acrylic components which make it quite a bit more flexible than regular thinset adhesive and therefore better suited to some applications. 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. Find the website that's made specifically for you. Why are physically impossible and logically impossible concepts considered separate in terms of probability? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I also used the Kerdi drain. Kerdi, a waterproofing membrane made of a special polyethylene fabric, should be allowed to completely dry prior to tiling. Your real issues are the lack of proper corners on this shower. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Slap it up comb it out, leave every ridge tall and perfect. After roughly two days I would fill the corner with silicone. Cement board sucks up the moisture and as a result, the kerdi doesn't always stick as well to cement board. What do you mean it doesn't adhere? If you want added info there's an old Kerdi thread here. The surface of Wedi is perfect for bonding. I imagine we could share some good stories. All shower/tub areas should have concrete board (I prefer hardiboard). The 30-in. We ended up sponging the Hardi and wetting and booking the Kerdi (a la wallpaper), and that made the installation go much smoother. However, you do still have to take care to waterproof the seams and the fastener penetrations to create a waterproof assembly. When having to put it up on the wall or measure it for size, you will find that you can get the exact measurements you need without much trouble. ), Minimising the environmental effects of my dyson brain, Finite abelian groups with fewer automorphisms than a subgroup. How should I transition between cement board floor and alcove tub? Set ceramic and stone tile over the KERDI membrane with unmodified thin-set mortar, including large format tiles. Kerdi Board is suitable for a number of interior applications. 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. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. Sheets of glass mat gypsum are made from water-resistant silicone-treated gypsum, reinforced on both sides by fiberglass mats. With so many different types of underlayment to choose from, it can be hard to decide which is best for your project. What I would be most scared off is the fact that no inside or outside corners appear to have been used. You troweled on thinset combing it out then pressed the Kerdi into place? . This will ensure that the coating sticks to the cement board. I simply sponge off the excess. Important to overlap seams in a shingle method. After installing your mud bed, make sure it is fully cured before applying Aquadefense. Continuing Education for Architects & Designers. Removing bathroom tile from cement backerboard, Transition from KERDI membrane backed, to not backed. The Schlter system tends to be more durable than a cement board, but it also depends on the particular application and the weather. I think the first one I used was cheap and that was part of the problem. x 48 in. 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. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Your email address will not be published. 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. 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. Gettin' a little delirious. However if installed on drywall it is only protecting one side. It allows you to easily and quickly create tile-ready elements in bathtub surrounds and platforms, vanities, showers, shelving, and much more. When it comes to applying KERDI, however, it is advised to use a regular thinset that includes portland cement as its main component. We think it is the cement board (Durock) sucking the moisture out of the unmodified thinset. We want that inside corner able to move. the cost of the tile job. Cement board comes both in 1/4-inch-thick and 1/2-inch-thick versions. Once the adhesive has been applied and has had time to properly cure, then the KERDI membrane can be applied to the wall. Been clankin' away at this computer for a couple of hours now, guys. Yup! if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'remodelormove_com-mobile-leaderboard-1','ezslot_24',166,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-mobile-leaderboard-1-0');If cement board is not waterproof, it can negatively impact the integrity of the tile that is installed on top of it, and can lead to a variety of issues. True cement board (Durck, Wonderboard) is my first choice as a tile or Kerdi backer. This feature makes building the base structure much easier and more cost . In normal residential use I wouldn't worry about it. Without an underlayment, even the slightest movement of the subfloor can result in cracking of the tile and crumbling of the grout lines. Seams and joints should also be waterproofed and caulked to prevent water from seeping through. 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. Install the drain adapter, if needed. 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. 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. Furthermore, if another trade, such as the shower glass installers, makes a mistake then you'll be . The cement board needs to be clean, free of debris, and dry. Depending on factors such as room temperature, humidity, and ventilation in the area, this could take anywhere from 1 to 3 days. http://www.schluter.com/schluter-us/en_US/Shower-System/KERDI-SHOWER-KIT/Schluter%C2%AE-KERDI-SHOWER-KIT/p/KERDI_SHOWER-KIT, We've added a "Necessary cookies only" option to the cookie consent popup. Using self-leveling underlayment takes careful prep work. craft paper or plastic is great if the inspector wants it but it is (should be) doing nothing for a tub surround that has HB/redgard/thinset/tile. Schulter Ditra is manufactured by Schluter Systems and is a 1/8 thick polyethylene uncoupling membrane that is specifically designed for tile installations. Additionally, a liquid water-resistant membrane should be applied over all surface areas before installation. Press the Kerdi Membrane into the Thinset Mortar with firm, even pressure to achieve full mortar coverage. So long as the seams and joint areas are properly prepared, the panels can also provide waterproofing. Builder saying he doesn't want to put my trim tile in here. PROBLEM SOLVED for Tub Flange when Installing Cement Board and Tile. 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! I have to redo my tub surround due to moisture leaks and failing grout. It is important to waterproof Hardie board to make it more water-resistant, as well as to protect the materials from the elements. How can I find out which sectors are used by files on NTFS? Actually if you watch any pros work (not on crappy shows) on TV you will see them use backer board 99% of the time. If you do not already have the hardi up, I recommend using real cement board (Hardi is a fiber-cement) or drywall. KERDI features a modified polyethylene (PEVA) core with non-woven polypropylene on both sides to anchor the membrane in the thin-set mortar. 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. The thickness of the tile is important, and should be known, but not because it changes the method of building. By the time you switch from the RG application to the Kerdi installation, it should be dry. I agree that gypsum seems very questionable anywhere in the wet areas of a shower. 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. I posted a plea for help and Mongo and Bill both gave me good advice. There is a product called Kerdiboard you might want to look into. And by 'booking the Kerdi' I mean we put it in the bathtub, sprayed it with the handshower, then booked it (just like wallpaper). If I go the kerdi membrane route, do I still need to tape the joints before installing the kerdi membrane . 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 .
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