liquid waterproofing (redgard) over durock cement board - bathroom Thanks to Mongo's earlier post, we knew we'd have to spritz the Hardi -- but found that even that wasn't quite enough. 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. ), Minimising the environmental effects of my dyson brain, Finite abelian groups with fewer automorphisms than a subgroup. I posted a plea for help and Mongo and Bill both gave me good advice. 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. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. Kerdi membrane over drywall in shower - qkfb.recidivazero.it Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. Is it Sinful to put Kerdi over Hardi-backer? - Houzz Yes, Hardie board needs to be waterproofed. The Ditra uncoupling design is lightweight, durable, and minimizes the possibility of cracked tile and grout. ".1) is is okay to use kerdi board instead of ditra on the floor? I have corrugated metal shower surround & grab bars. Hi.I have a unique situation. Fiber cement board is a variation of cement board that is made from compressed cement and sand and reinforced with wood fibers throughout. Whether or not you need a Kerdi membrane is a factor of use. Since KERDI is impervious, it does not deprive the mortar of its moisture. Ratings (91) (5) (91) (3 . I hope you made the guy flood test his work prior to tiling the shower floor. This thread is 9 years old and it's the Hardi board that's thirsty not the Kerdi. The Pros and Cons of Various Tile Backers | Family Handyman This will help to extend its lifespan and make sure it looks its best for years to come. Schluter Kerdi 108 Sq Ft Waterproofing Membrane - amazon.com 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. ", Signed,Never Hung Kerdi A Day In Her Life. A lot of folks like using cement board but it's heavy and requires a waterproofing membrane over it. Hardie board is a cement-based siding product that is water-resistant, but not waterproof. Step 4: Place the Tile. They are square. Important to overlap seams in a shingle method. I used this to seal a 3 1/2 by 6 1/2 foot shower with 7 foot walls. Asking for help, clarification, or responding to other answers. Allow the primer to dry completely before proceeding with the KERDI installation. 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. Cut the Kerdi membrane to size using a utility knife or scissors. 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. If installing large format tiles (over 15"), be sure to give the Aquadefense at least 8 hours to cure first. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. Then you can apply a thin layer of KERDI-FIX to the board, the membrane over top, and use a rolling pin to press it down and ensure a secure bond. I also used a larger sized trowel than the one recommend by Schluter. Installing cement board involves placing the boards atop a layer of thinset adhesive, a process known as bedding. 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. ! How to install a kerdi membrane over cement backer board - Quora Please feel free to reach out to our Product Support Team at 1-800-992-6273 if you need anything. Backerboard plus a waterproofing membrane like Redgard is all that is needed for tub surrounds with thinset then tile. If cement board had been used, most likely the damage would have been much less that what I have to deal with now. No, that doesn't sound right. 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. If you want to go to the extra effort of putting the membrane over drywall, there is no need to use greenboard. Hardibacker is a VERY "thirsty" material that sucks the moisture out of the mortar VERY quickly and I don't like it. It's not a matter of trusting the Kerdi. 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. One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. Kerdi-Shower-T/-TS/-TT is a prefabricated sloped shower tray with integrated Kerdi waterproofing. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When it comes to using thinset with Schluter products, the Schluter-Systems website recommends using unmodified thin-set mortars specifically designed for use with Schluter membranes. It is also essential that cement board joints and fasteners be sealed and waterproofed with the Kerdi Fix sealant to help prevent water from leaking into the wall and floor cavities. Firstly, it is important to ensure the wall is adequately prepared and that it is smooth, flat and free of defects. If you are laying tile on floors that are wavy or out of level, self-leveling underlayment is a great solution. However, you do still have to take care to waterproof the seams and the fastener penetrations to create a waterproof assembly. To waterproof Hardie board, you should choose a quality sealer that is designed for use on cement-based sidings. We recommend our users to update the browser. Even the tiling subs have moved away from mortar walls because of the labor cost and lack of craftsmen in the industry. Given the complexity, its easy to see why even experienced tile setters avoid dry-pack mortar and use backer board instead when they can. Using Kerdi Schlueter membrane with cement board. - Houzz Wedi showers feature a pre-sloped base that is already installed. Step 7: Cut the Tile. Another advantage is that the polyisocyanurate core of foam boards is waterproof. link to What Kind Of Paint For Garage Walls? Finally, use a roller or brush to ensure that the membrane is secure and has no wrinkles or air bubbles. I appreciate your help and your quick response. For the floor I make a dry mix mud base and then the Kerdi membrane. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. However, if installed on drywall, it only protects one side. Houzz utilise des cookies et d'autres technologies de suivi similaires pour personnaliser mon exprience utilisateur, me proposer du contenu pertinent et amliorer ses produits et services. The major drawback to cement boards is their weight, as they are incredibly heavy and can be difficult to cut. If you are good with a trowel and understand how to set up and use screeds as a guide for leveling or forming the mortar, pouring a traditional mortar bed may be a good alternative to tile backer board, especially on uneven or sloping floors. After installing your mud bed, make sure it is fully cured before applying Aquadefense. Why do small African island nations perform better than African continental nations, considering democracy and human development? Drywall under Kerdi would have been a better choice. Depending on factors such as room temperature, humidity, and ventilation in the area, this could take anywhere from 1 to 3 days. Cement board is a heavy mess compared to drywall, and drywall is a heavy mess compared to Kerdi Board. Additionally, all thin-set should be allowed to cure for 24 hours before tiles are installed. Waterproofing cement board is relatively simple and there are several different waterproofing products available. How long should I wait after painting on the Redgard before I try to reapply the membrane? 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. 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. Foam-core tile backing board has two big advantages over other backer boards. 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. DensShield is one common brand. Kerdi can even be installed over drywall. If you do not already have the hardi up, I recommend using real cement board (Hardi is a fiber-cement) or drywall. Though, each product comes with its own individual characteristics, and pros and cons. You provide the pitch during the tile set. We are no longer supporting IE (Internet Explorer), Do not Sell or Share My Personal Information. Step 6: Choosing the Next Tile. Seems like I've been using the full measure of water the bag calls for, plus about 10%.-50 lbs of thinset at a time is too much for an amatuer. Cement board sucks up the moisture and as a result, the kerdi doesn't always stick as well to cement board. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. I want to mount a cast iron bathtub, but not pull down my 1905 plaster and lath. We tried soaking the cement board and applying the kerdi in small sections. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. 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. Additionally, the use of modified thinset with KERDI could lead to cracks and other issues down the line as the modified thinset can shrink and pull away from the KERDI membrane over time. Putting this stuff on walls is difficult and time . Probably the simplest way is to caulk the gap with 100% silicone or a urethane sealant. Overall, putting Kerdi over regular drywall can be done, with the proper steps in place to properly install the membrane and its components. Foam-core tile backing board has two big advantages over other backer boards. It is important to overlap the edge of the membrane so that it covers slightly more than half of the drywall behind it. 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 . Should I use Kerdi membrane or cement backerboard? Waterproofing is an important aspect of any bathroom or wet-area installation. 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. Waterproof showers are the trend today, so RedGard is an excellent alternative to cement boards that act as vapor barriers. Sloped Shower Tray KST1220/1525 - The Home Depot. Kerdi board is a kind of waterproofer because these kinds of boards are made of XPS foam. How should I transition between cement board floor and alcove tub? To create a watertight shower assembly, we installed Schluter's Kerdi membrane over the drywall, just as we would for tile.Write by:. While cement board may be the most common and widely-known tile substrate, Kerdi Board is giving it a run for its money. It is important to waterproof Hardie board to make it more water-resistant, as well as to protect the materials from the elements. #2 - Your suggestion has plenty of merit though. I'm thirsty. There are many different types of underlayment to choose from, but they all serve the same purpose. First, it's super lightweight compared with the rest. 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 colour is different. It may take more than 1 beer:). This is the traditional tile backer. The niche' intermediate shelf isn't actually attached, to enable specific placement for each unique tiling application. What? We want that inside corner able to move. I like to use a garden sprayer to keep the thirsty Kerdi wet. What precautions should I take installing tile on a backerboard in an area surrounded by cement? This liquid waterproofing solution does more than keep water away, it also promotes tile adhesion and prevents cracking. Hardie board is thirsty, but that's way too fast. We don't expect people to master this and in fact I know maybe two guys in my area (live in big city) that could do this. 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. We apply the thinset the recommended trowel, can't remember what size off the top of my head, in small sections and by the time my husband hands my the piece of membrane the thinset is not skinned over but certainly dry. However, the answer you provided above suggests that the OP could omit a waterproof membrane, that I. Kerdi on shower curbs - JLC-Online Forums Kerdi membrane is a waterproofing material that is designed to be used in wet areas such as bathrooms and showers before tiles are installed. Tornado Warning Charlotte Nc Now, Articles K
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kerdi membrane over cement board

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kerdi membrane over cement board

What I would be most scared off is the fact that no inside or outside corners appear to have been used. Also are you saying that you wet ("booking the Kerdi") the Kerdi, as well? In . Once the wall is prepped, use a primer that is compatible with the KERDI membrane so that it will properly adhere to the wall. Then cement, sand and water are mixed together to a crumbly consistency and floated over the lath to form a flat surface. Furthermore, if another trade, such as the shower glass installers, makes a mistake then you'll be . And second, since it's foam, the board is super easy to cut with just a utility knife. We tried adding water to the thinset, we tried using a larger notch trowel, but nothing seems to make the Kerdi stick. 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. Houzz Pro: One simple solution for contractors and design pros, surfer thanked Avanti Tile & Stone / Stonetech. This will prevent water from entering from behind the membrane, and will provide a more secure waterproof layer. As far as the tile/prep work, you are right that he is shifting the blame. I usually use Durock. liquid waterproofing (redgard) over durock cement board - bathroom Thanks to Mongo's earlier post, we knew we'd have to spritz the Hardi -- but found that even that wasn't quite enough. 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. ), Minimising the environmental effects of my dyson brain, Finite abelian groups with fewer automorphisms than a subgroup. I posted a plea for help and Mongo and Bill both gave me good advice. 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. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. Kerdi membrane over drywall in shower - qkfb.recidivazero.it Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. Is it Sinful to put Kerdi over Hardi-backer? - Houzz Yes, Hardie board needs to be waterproofed. The Ditra uncoupling design is lightweight, durable, and minimizes the possibility of cracked tile and grout. ".1) is is okay to use kerdi board instead of ditra on the floor? I have corrugated metal shower surround & grab bars. Hi.I have a unique situation. Fiber cement board is a variation of cement board that is made from compressed cement and sand and reinforced with wood fibers throughout. Whether or not you need a Kerdi membrane is a factor of use. Since KERDI is impervious, it does not deprive the mortar of its moisture. Ratings (91) (5) (91) (3 . I hope you made the guy flood test his work prior to tiling the shower floor. This thread is 9 years old and it's the Hardi board that's thirsty not the Kerdi. The Pros and Cons of Various Tile Backers | Family Handyman This will help to extend its lifespan and make sure it looks its best for years to come. Schluter Kerdi 108 Sq Ft Waterproofing Membrane - amazon.com 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. ", Signed,Never Hung Kerdi A Day In Her Life. A lot of folks like using cement board but it's heavy and requires a waterproofing membrane over it. Hardie board is a cement-based siding product that is water-resistant, but not waterproof. Step 4: Place the Tile. They are square. Important to overlap seams in a shingle method. I used this to seal a 3 1/2 by 6 1/2 foot shower with 7 foot walls. Asking for help, clarification, or responding to other answers. Allow the primer to dry completely before proceeding with the KERDI installation. 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. Cut the Kerdi membrane to size using a utility knife or scissors. 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. If installing large format tiles (over 15"), be sure to give the Aquadefense at least 8 hours to cure first. We installed cement board on the walls, and today when we attempted to apply the Kerdi membrane we could not get it to adhere. Then you can apply a thin layer of KERDI-FIX to the board, the membrane over top, and use a rolling pin to press it down and ensure a secure bond. I also used a larger sized trowel than the one recommend by Schluter. Installing cement board involves placing the boards atop a layer of thinset adhesive, a process known as bedding. 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. ! How to install a kerdi membrane over cement backer board - Quora Please feel free to reach out to our Product Support Team at 1-800-992-6273 if you need anything. Backerboard plus a waterproofing membrane like Redgard is all that is needed for tub surrounds with thinset then tile. If cement board had been used, most likely the damage would have been much less that what I have to deal with now. No, that doesn't sound right. 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. If you want to go to the extra effort of putting the membrane over drywall, there is no need to use greenboard. Hardibacker is a VERY "thirsty" material that sucks the moisture out of the mortar VERY quickly and I don't like it. It's not a matter of trusting the Kerdi. 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. One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. Kerdi-Shower-T/-TS/-TT is a prefabricated sloped shower tray with integrated Kerdi waterproofing. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When it comes to using thinset with Schluter products, the Schluter-Systems website recommends using unmodified thin-set mortars specifically designed for use with Schluter membranes. It is also essential that cement board joints and fasteners be sealed and waterproofed with the Kerdi Fix sealant to help prevent water from leaking into the wall and floor cavities. Firstly, it is important to ensure the wall is adequately prepared and that it is smooth, flat and free of defects. If you are laying tile on floors that are wavy or out of level, self-leveling underlayment is a great solution. However, you do still have to take care to waterproof the seams and the fastener penetrations to create a waterproof assembly. To waterproof Hardie board, you should choose a quality sealer that is designed for use on cement-based sidings. We recommend our users to update the browser. Even the tiling subs have moved away from mortar walls because of the labor cost and lack of craftsmen in the industry. Given the complexity, its easy to see why even experienced tile setters avoid dry-pack mortar and use backer board instead when they can. Using Kerdi Schlueter membrane with cement board. - Houzz Wedi showers feature a pre-sloped base that is already installed. Step 7: Cut the Tile. Another advantage is that the polyisocyanurate core of foam boards is waterproof. link to What Kind Of Paint For Garage Walls? Finally, use a roller or brush to ensure that the membrane is secure and has no wrinkles or air bubbles. I appreciate your help and your quick response. For the floor I make a dry mix mud base and then the Kerdi membrane. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. However, if installed on drywall, it only protects one side. Houzz utilise des cookies et d'autres technologies de suivi similaires pour personnaliser mon exprience utilisateur, me proposer du contenu pertinent et amliorer ses produits et services. The major drawback to cement boards is their weight, as they are incredibly heavy and can be difficult to cut. If you are good with a trowel and understand how to set up and use screeds as a guide for leveling or forming the mortar, pouring a traditional mortar bed may be a good alternative to tile backer board, especially on uneven or sloping floors. After installing your mud bed, make sure it is fully cured before applying Aquadefense. Why do small African island nations perform better than African continental nations, considering democracy and human development? Drywall under Kerdi would have been a better choice. Depending on factors such as room temperature, humidity, and ventilation in the area, this could take anywhere from 1 to 3 days. Cement board is a heavy mess compared to drywall, and drywall is a heavy mess compared to Kerdi Board. Additionally, all thin-set should be allowed to cure for 24 hours before tiles are installed. Waterproofing cement board is relatively simple and there are several different waterproofing products available. How long should I wait after painting on the Redgard before I try to reapply the membrane? 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. 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. Foam-core tile backing board has two big advantages over other backer boards. 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. DensShield is one common brand. Kerdi can even be installed over drywall. If you do not already have the hardi up, I recommend using real cement board (Hardi is a fiber-cement) or drywall. Though, each product comes with its own individual characteristics, and pros and cons. You provide the pitch during the tile set. We are no longer supporting IE (Internet Explorer), Do not Sell or Share My Personal Information. Step 6: Choosing the Next Tile. Seems like I've been using the full measure of water the bag calls for, plus about 10%.-50 lbs of thinset at a time is too much for an amatuer. Cement board sucks up the moisture and as a result, the kerdi doesn't always stick as well to cement board. One of the major benefits of opting for Kerdi Board over cement board is the ease of installation. I want to mount a cast iron bathtub, but not pull down my 1905 plaster and lath. We tried soaking the cement board and applying the kerdi in small sections. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. 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. Additionally, the use of modified thinset with KERDI could lead to cracks and other issues down the line as the modified thinset can shrink and pull away from the KERDI membrane over time. Putting this stuff on walls is difficult and time . Probably the simplest way is to caulk the gap with 100% silicone or a urethane sealant. Overall, putting Kerdi over regular drywall can be done, with the proper steps in place to properly install the membrane and its components. Foam-core tile backing board has two big advantages over other backer boards. It is important to overlap the edge of the membrane so that it covers slightly more than half of the drywall behind it. 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 . Should I use Kerdi membrane or cement backerboard? Waterproofing is an important aspect of any bathroom or wet-area installation. 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. Waterproof showers are the trend today, so RedGard is an excellent alternative to cement boards that act as vapor barriers. Sloped Shower Tray KST1220/1525 - The Home Depot. Kerdi board is a kind of waterproofer because these kinds of boards are made of XPS foam. How should I transition between cement board floor and alcove tub? To create a watertight shower assembly, we installed Schluter's Kerdi membrane over the drywall, just as we would for tile.Write by:. While cement board may be the most common and widely-known tile substrate, Kerdi Board is giving it a run for its money. It is important to waterproof Hardie board to make it more water-resistant, as well as to protect the materials from the elements. #2 - Your suggestion has plenty of merit though. I'm thirsty. There are many different types of underlayment to choose from, but they all serve the same purpose. First, it's super lightweight compared with the rest. 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 colour is different. It may take more than 1 beer:). This is the traditional tile backer. The niche' intermediate shelf isn't actually attached, to enable specific placement for each unique tiling application. What? We want that inside corner able to move. I like to use a garden sprayer to keep the thirsty Kerdi wet. What precautions should I take installing tile on a backerboard in an area surrounded by cement? This liquid waterproofing solution does more than keep water away, it also promotes tile adhesion and prevents cracking. Hardie board is thirsty, but that's way too fast. We don't expect people to master this and in fact I know maybe two guys in my area (live in big city) that could do this. 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. We apply the thinset the recommended trowel, can't remember what size off the top of my head, in small sections and by the time my husband hands my the piece of membrane the thinset is not skinned over but certainly dry. However, the answer you provided above suggests that the OP could omit a waterproof membrane, that I. Kerdi on shower curbs - JLC-Online Forums Kerdi membrane is a waterproofing material that is designed to be used in wet areas such as bathrooms and showers before tiles are installed.

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