I simply sponge off the excess. I have corrugated metal shower surround & grab bars. What do you mean it doesn't adhere? I still wet the walls first. It is important to seal any imperfections in the drywall to ensure a long-lasting installation and to minimize water infiltration. I would avoid Hardi, as Avanti is right that it is thirsty. #3 This is a DIY site. For the floor I make a dry mix mud base and then the Kerdi membrane. Additionally, seal the space around any pipes and fixtures that can be found in the shower. You are wise to use a cement board. Another advantage is that the polyisocyanurate core of foam boards is waterproof. ), Schluter SET, ALL-SET, FAST-SET or an unmodified thin-set mortar is recommended. The Ditra uncoupling design is lightweight, durable, and minimizes the possibility of cracked tile and grout. If done according to manufacturers instructions, it will seal nicely. Recovering from a blunder I made while emailing a professor, Minimising the environmental effects of my dyson brain. What are the differences between "paperless drywall" and "cement board"? 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. Maybe try another brand of thinset? Once you have selected the right sealer, follow the manufacturers instructions and apply a generous, even coat over the entire surface of the Hardie board. This allows for future compression and an area at the corner where things are more forgiving. 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. Rolling pin, good, now I can throw away my magnesium float.LOLCasey. Connect and share knowledge within a single location that is structured and easy to search. First, its super lightweight compared with the rest. x 48 in. Drywall under Kerdi would have been a better choice. 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. Putting this stuff on walls is difficult and time . Anytime Mongo. Can I put Kerdi board over drywall? 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. The fastest method [for me and possibly other dilettants] is to stroke the knife at a diagonal to the comb marks, top down, center out, pushing all the air before you with short, overlapping strokes.-Thinset needs to be pretty darn wet: Needs to stay put when combed, but should be soft and shiney. Hang the cement boar. Politique d'Utilisation des Cookies de Houzz. However, you do still have to take care to waterproof the seams and the fastener penetrations to create a waterproof assembly. With Kerdi Board you get to enjoy an effective product that is lightweight, easy to cut, waterproof, and leaves behind no dust! Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. This means that even if your waterproofing system leaks, the cement board will remain intact. 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. We like that the Kerdi membrane material installs easily over almost any substrate, including standard wallboard. Kerdi Board vs. Cement Board. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. Why is there a voltage on my HDMI and coaxial cables? This is necessary to ensure that the membrane will adhere properly to the drywall. What precautions should I take installing tile on a backerboard in an area surrounded by cement? You provide the pitch during the tile set. Is this overkill? Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. 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. Run a damp towel over the cement board surface to dust . Once you have determined the type of thinset, its important to also consider the weather conditions during installation. RedGard On Hardibacker Board. 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. A lot of folks like using cement board but it's heavy and requires a waterproofing membrane over it. You still use metal lath, but then mix bags of powder and pour the soupy mix onto the floor. 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. 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)). As fiber cement board is similar to regular cement board, it makes sense to choose the one that is cheaper or more readily available. She grew up surrounded by constant home improvement projects and owes most of what she knows to helping her dad renovate her childhood home. Mike Holmes uses backer on his show. Aquadefense is approved by IAPMO for use as a shower pan liner, but be sure to check your local building codes, as some areas of the country still require the PVC liner. 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 curb doesn't have to be any wider than a 2x4. Sloped Shower Tray KST1220/1525 - The Home Depot. the cost of the tile job. Following these steps will help ensure that your shower space is properly sealed, and thus that the cement board is well protected from moisture. And by 'booking the Kerdi' I mean we put it in the bathtub, sprayed it with the handshower, then booked it (just like wallpaper). Your Get free, zero-commitment quotes from pro contractors near you. When it comes to installation, a Schlter system is typically easier to install than a cement board, and it also allows for more design freedom as it does not require a traditional waterproof layer. This will ensure that the coating sticks to the cement board. I just a few weeks ago put kerdi on top of hardi-board in my shower and it was PAINFUL! 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This product is available in 3/16", 3/8", 1/2", 5/8" 3/4", 1" 1-1/2" and 2" thicknesses, allowing for a wide variety of installation options. Applying a conventional cement backer board to such a structure is almost impossible. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. Finally, use a roller or brush to ensure that the membrane is secure and has no wrinkles or air bubbles. Anyone who has done more than 1 shower shouldn't start without knowing that. Finally, it is important to remember that any thin-set that has been exposed to moisture must be replaced. Kerdi Board is suitable for a number of interior applications. When screwed to the framing, thin strips of cement board fracture more easily than thin strips of fiber-cement. 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. Caulk the gap. We tried soaking the cement board and applying the kerdi in small sections. Spacers are the next step. Most cement-based thin-set mortars are suitable; however, it is important to check the manufacturers instructions to ensure that the product is approved for use with Schluter systems. Or will the Kerdi membrane (with seams taped with kerdi band) prevent each board from moving independently? 3. Should I use Kerdi membrane or cement backerboard? Using self-leveling underlayment takes careful prep work. Look at it this way; Withe Kerdi, you either trust it or you don't. I also used the Kerdi drain. The 30-in. . @JimmyFix-it - You are right. Additionally, the drywall should be primed with a latex primer before applying the Kerdi membrane. Our thinset was more watery than the videos, but it still managed to dry out quickly, even in the time it takes to apply the small corners in our shampoo niche. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Thanks for contributing an answer to Home Improvement Stack Exchange! We want that inside corner able to move. I think it is engrained in me to do that so I forget to mention it. Do new devs get fired if they can't solve a certain bug? My understanding is that Schluter-Kerdi, being a sheet topical membrane, recommends just going with regular drywall instead of cement board but you can certainly use cement board as the substrate. Step 3: Apply Thinset. 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. Now there's nothing particularly wrong with fiber-cementit's just not my first choice. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. Cement board is particularly vulnerable to water damage, so waterproofing can help protect it and help it last longer. Kerdi really offers very little advantage over hardiboard plus membrane. Firstly, it is important to ensure the wall is adequately prepared and that it is smooth, flat and free of defects. I also used the Kerdi drain. We think it is the cement board (Durock) sucking the moisture out of the unmodified thinset. Needed to interject a little "amateur humor. The difference between the phonemes /p/ and /b/ in Japanese. Can be cut to size easily using a utility knife. link to What Kind Of Paint For Garage Walls? Kerdi, a waterproofing membrane made of a special polyethylene fabric, should be allowed to completely dry prior to tiling. And second, since it's foam, the board is super easy to cut with just a utility knife. Find the website that's made specifically for you. In general, the Schlter system is typically more expensive than a cement board, and some people may find this an attractive option for its long lasting, easy to maintain qualities. If you are laying tile on floors that are wavy or out of level, self-leveling underlayment is a great solution. No, you do not need to install a vapor barrier, as Kerdi Board is the vapor barrier. Once all areas have been properly waterproofed, the walls can be tiled and grouted to create a waterproof surface. Cement board (cbu) is not waterproof, but is not damaged by being wet. Their lighter weight makes moving panels around during installation a cinch, which is a far cry from the heft of conventional cement board. Why is this the case? . Since my guys and I will be doing this for the first time next week, I 'd like to take advantage of your 'learning curve.' If you ensure that silicone goes in and that the thin-set and grout do not bind there you should be good to go. RedGard can be used on a wide range of interior and exterior surfaces. Furthermore, if you're working in an older home KERDI-BOARD fits better than cement board in odd spaces. When installing KERDI with . Its important to note that Kerdi membrane is not a structural base layer, so plywood should be installed and reinforced as necessary based on load requirements. Cementboard sufficient to a tub surround is dirt cheap .vs. Je peux rejeter les cookies non essentiels en cliquant sur Grer mes prfrences . 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. I used to "trust" the Kerdi and drywall until I had a shower that the valve broke inside the wall cavity four years after being put in. Is a PhD visitor considered as a visiting scholar?