Re: Kerdi on shower curbs. Mike Holmes uses backer on his show. I think I'll try using the thinned mixture of Redgard and then try the Kerdi membrane again. RedGard can be used on a wide range of interior and exterior surfaces. Kerdi can be installed first on drywall or cement board. My floor tiles are 2" x 2"." - Lisa Jasper No - you can not use Kerdi Board on the floor. Let the mortar dry for 24 hours then test the shower. #4 You could be adding a good 1000 pounds to your install too. We mixed the thinset, it wasn't as smooth as the utube video, but it was close, and we gave it ten minutes. Additionally, if the cement board isnt waterproof, it can also cause mold and mildew issues, as well as dry wall damage from the moisture seeping through. Once all areas have been properly waterproofed, the walls can be tiled and grouted to create a waterproof surface. First, its super lightweight compared with the rest. 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. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. You just need a hammer and wonderbar for the walls. Ditra is manufactured in a 3'3 width and comes in various roll lengths (54sf, 150sf, and 323 sf). Slap it up comb it out, leave every ridge tall and perfect. Maybe try another brand of thinset? link to What Kind Of Paint For Garage Walls? Underlayment is designed to smooth out uneven areas of the subfloor and form a rigid layer that prevents the flooring from bending. 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. Just wondering how effective is the tile on kerdi membrane vs the traditional cement backboard where tiles are glued directly to the drywall? With cement board as a substrate, the key is to ensure proper installation of the membrane. DensShield is one common brand. You are wise to use a cement board. Greenboard is the same as regular drywall. 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 and grout are not water proof, if there's Kerdi no moisture is ever going to be able to get behind it. Tile can be installed directly over Kerdi-Board using the thinset method; For use with ceramic and natural stone tile; Return Policy; California residents. Yeah it seems that the only products that will be compatible with cement board and the kerdi membrane are bostik ditra-set and schluter all-set (or one of schluters other products). 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. With that said, the key benefits of Kerdi Board include: While cement board may be the most common and widely-known tile substrate, Kerdi Board is giving it a run for its money. Press the Kerdi Membrane into the Thinset Mortar with firm, even pressure to achieve full mortar coverage. The site is called floorelf.com. Properly waterproofed Hardie board should last for many years. Will add it in. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. Preparing drywall for KERDI membrane requires a few important steps to ensure a successful application. Why do you think each board should be able to move at all let alone independently? Kerdi board, on the other hand, is an extruded polystyrene foam panel. I also used the Kerdi drain. One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. 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. Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. Cut the shower tray to size. Even the tiling subs have moved away from mortar walls because of the labor cost and lack of craftsmen in the industry. They are designed to provide a waterproof, vapor-tight layer to the substrate, which in this case would be the cement board. With Kerdi Board you get to enjoy an effective product that is lightweight, easy to cut, waterproof, and leaves behind no dust! Regardless, cement board is a great, trusted tile substrate that will work well on both walls and floors. is that because water doesn't really hit that area?" - Lisa Jasper That's pushing it but should be fine. 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. RedGard On Hardibacker Board. Yes, KERDI membrane will stick to cement board. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Why are physically impossible and logically impossible concepts considered separate in terms of probability? They can be installed on any type of support and can even be used to create partitions, with no structural support required. A lot of folks like using cement board but it's heavy and requires a waterproofing membrane over it. Kerdi's systems are fairly reputable. Cement board is a bit better, but you need to spray either one before applying the mortar so that it doesn't "skin over" before you can get the Kerdi up. Can you remove tile from Kerdi membrane? What's the difference between a power rail and a signal line? A place where magic is studied and practiced? 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. Installing cement board involves placing the boards atop a layer of thinset adhesive, a process known as bedding. The bag says Mapei floortile mortar, it was the only unmodified thinset at our hardware store. It may take more than 1 beer:). 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. Kerdi Board panels have a number of other advantages: they can be cut to size using an ordinary utility knife, can be glued or screwed into place, and are very lightweight. @JimmyFix-it - You are right. Step 2: Determine the room's center. Why you use cement board? Schluter says that the Kerdi membrane and tile can be installed over standard gypsum wall board without any problems. Ratings (91) (5) (91) (3 . Thanks for contributing an answer to Home Improvement Stack Exchange! Building Panel: Price $ 119 00 $ 202 06 $ 279 00. Additionally, all seams should be sealed with Kerdi Fix and covered with fleece. Yes, it is possible to put Kerdi over regular drywall. 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. Cement board is readily available and relatively inexpensive (about $10 for a 3 x 5-ft. sheet). Additionally, all thin-set mortars should be suitable for use in wet or feature depths of up to 1/8 inch. If youre not careful, the boards can also leave behind abrasive sandy crumbs that can cause damage to your shower base or tub. Allow the adhesive to cure for the amount of time recommended by the adhesives manufacturer. If your going to do the job do it right, and give professional advice pls. In normal residential use I wouldn't worry about it. If you want a cement board, use Durock or Wonderboard. x 33 ft. Waterproofing Membrane: Kerdi-Board 1/2 in. Firstly, it is important to ensure the wall is adequately prepared and that it is smooth, flat and free of defects. RedGard, on the other hand, is a liquid waterproofing membrane made by Custom Building Products. Asking for help, clarification, or responding to other answers. Why do small African island nations perform better than African continental nations, considering democracy and human development? Modified thin-set mortars must dry for the polymers to coalesce and form a hard . rev2023.3.3.43278. @JimmyFix-it - hardiboard is not really porous unless it is completely saturated. Send us an email: , What type of thin-set mortar should I use when installing Schluter, Using a Prefabricated Shower Tray and Ramp. Thanks. Start by cleaning the cement board with a mineral oil soap; this will help reduce mold and mildew growth throughout the life of the shower. 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. The use of modified thinset adhesive could result in an inadequate bond and could lead to possible delamination. #2. Kerdi Board is expensive, but I can justify it because it saves time, and it's a joy to use. It could take longer if the space is particularly wet or humid. ", Signed,Never Hung Kerdi A Day In Her Life. I don't want to use the Ditra membrane product but rather tiles directly over the cement boards. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? For the floor, he should've put a mortar bed, then a membrane that goes over the curb, then another mortar bed. How did this project turn out? You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. The shower is ready for tile. Install the Schluter Kerdi membrane over the backer board using the correct mortar. Anytime Mongo. 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. This thread is 9 years old and it's the Hardi board that's thirsty not the Kerdi. The colour is different. While cement board is a reliable tile underlayment, it isnt completely waterproof only water-resistant. Needless to say, the drywall turned to mush. Fixing that is not that easy though. Step 7: Cut the Tile. I've never had a failure. You still use metal lath, but then mix bags of powder and pour the soupy mix onto the floor. Kerdi Board vs. Cement Board. Kerdi can even be installed over drywall. Putting this stuff on walls is difficult and time . This is a bit difficult to answer as it depends on the particular application for the floor system. If cement board had been used, most likely the damage would have been much less that what I have to deal with now. The great thing about Kerdi Board is that it is lightweight and easier to maneuver. x 48 in. Applying a conventional cement backer board to such a structure is almost impossible. The taping knife at a low angle makes an enormous difference, and I'm very grateful for that hint. 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. Hardie board is a cement-based siding product that is water-resistant, but not waterproof.
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