Kerdi over purple drywall. It seems to be a common consensus that this is not ideal.
Kerdi over purple drywall Jan 18, 2023 · When building a shower or a kitchen, it's normal to come across scenarios where the Kerdi board meets the drywall. Looking for opinions, would waterproof drywall behind Kerdi membrane be insurance Yes, you can put KERDI over regular drywall. Being in a business where you never want callbacks, it has some merit if people are willing to pay for it. To make sure I have my thoughts straight, the purple board which is currently used in both my future shower and guest bath areas is a no go and can only be remediate if a water proof membrane or Kerdi system goes over it? 3 As a contractor, I have been using Kerdi since it came out. Now I would like to install Kerdi over the wall for a shower enclosure. Yes. There is also a large niche framed out in purple board. Tile shower walls need to be waterproofed and drywall i Jul 31, 2019 · KERDI is a great waterproofing system, but it is only as effective as the installation. If you must tape the joints per fire code requirements, make sure… Learn how to properly install drywall in a bathroom and waterproof it to prevent mold and moisture damage. I've tiled a ton over hardboard, go board, kerdi and mostly wedi. Everyone has their own opinion on which system or method to do. sorry to revive this, but I am doing the same with 18x36 tiles. It’s essential to use an appropriate backing material, such as cement board or Kerdi-Board, for your shower walls Mar 4, 2008 · Wanted to add one more thing:In my area, per code we can't do Kerdi over drywall. Do you Kerdi guys just run a damp sponge over the rock before thin set or do you prime the rock first. Your kerdi board placed over the top (when used with the proper thinset) will block the water from reaching this layer. It is primed. The manufacturer says regular drywall is fine because the Kerdi membrane is waterproof. Sep 13, 2018 · Yes, you can. If you're remodeling a bathroom and need help, join our Video Library of over 350 step-by-step tutorials at https Dec 29, 2018 · It’s purple drywall that the drywall guys said is for use in bathrooms but I believe it’s going to get saturated. Jun 30, 2018 · I'm going to use the Schluter Kerdi system for my shower, mainly because it's less work and seems more fool proof than the traditional mortar bed. My question is how I finish this ledge where the tiled kerdi board meets the “drywall” (I used some kerdi in place of drywall to fill out the removed plaster board). In the bathroom, I have installed the drywall with green board. I usually use Kerdi, but I am sick and tired of installing Kerdi, mixing thinset and having to deal If you mud and tape all that shit flat and fill all those gaps before you apply the barrier and use extra mesh or better yet a roll of Kerdi Seam Tape over those garbage joints can probably save that install and use a liquid barrier Alternative Solutions If you have painted drywall and are considering using Kerdi for your tile installation, there are alternative options available. gonna use the green stuff for the drywall but only Kerdi in the wet areas. And Kerdi over drywall is cheaper materials-wise than Kerdiboard, although it requires more labor. May 27, 2010 · Would the Kerdi be going over plaster or painted drywall? If it's only painted drywall, maybe scuff the paint and use a quality unmodified like Kerabond. I use the flat side of my KERDI trowel for this step. No. If you are concerned about mold, skip the greenboard and just get paperless drywall. And if you use Kerdi you really should use the complete system with the special Kerdi drain. Nov 9, 2021 · Kerdi Membrane Installation is typically the first step in the Schluter Kerdi Shower Kit System installation process. Also, we're going to have a 4x6 curb and wondering how that would be built out with Kerdie board walls. It seems to be a common consensus that this is not ideal. Should it be painted first? Is paint a bond breaker? What about near a sink? Dec 14, 2014 · Purple or regular drywall with Kerdi membrane? Tile Forum/Advice Board Rip out the moisture resistant and replace with wonder board (even though the drywall is complete) Use a kerdi membrane fabric over the moisture resistance drywall and tile and call it a day… Dec 7, 2024 · walls went up. The time now is 05:33 AM. The truth is neither should be used in a shower build in my opinion but if you are going to go this crazy route. My question, is doing the whole bathroom in moisture resistant drywall overkill anyway, or is this actually the proper way to do it? Sep 21, 2025 · Tile over purple drywall can be done as long as the drywall is in good condition and the surface is smooth. Read more What a loaded question. I would like to somehow waterproof it and tile over it with white subway tiles. Most guys here know that TCNA isn't code, it's more suited to the "best building practices" category. I apply a thin coating of ALL-SET to the wall immediately after dampening it. To the original poster, since you could possibly damage the foam Kerdi-Tray when installing the drywall, it might be smarter to hang the drywall and then set the We've answer some of the most commonly asked questions in this FAQ'- Kerdi Questions and Answers to guide you for a successful renovation! Sep 15, 2018 · Dampen new drywall or cement board before applying thin-set. Typically, green/purple drywall + Schlueter will be cheaper than using cement board and results in a superior product when applied correctly. John is a belt and suspender kind of person. You can also use Red Gard instead I'm doing research to find out what to do in regards to waterproofing walls before I'm ready for tile and overwhelmed by the amount of conflicting info out there. This causes the thin-set to skin over prematurely and prevents the KERDI membrane from sticking to the wall. Back to KERDI membrane installation. I would be Schluter ® -KERDI is a pliable sheet-applied waterproofing membrane and vapor-retarder designed for the direct application of tile. • Flaking paint can affect drywall adhesion to Kerdi membrane – One of the reasons I am advising you to scuff up the paint is to prevent such scenarios. I was planning on using the Schluter kerdi membrane before I tile but now I'm unsure on what to do at the Dec 29, 2015 · Which shower tile backer board is best? Cement board, Wedi board, Kerdi board, Hardibacker, Densshield, Durock, Permabase, or Wonder board Apr 25, 2020 · Toilets, Sinks, Showers, Dishwashers, Tubs and Garbage Disposals - Purple drywall - Is it acceptable for use on a tiled shower wall? If so, is a vapor barrier required behind it? Sep 4, 2020 · Neither one! Outside of the shower is not considered a wet area, and good paint over plain drywall works just fine. Important to overlap seams in a shingle method. From what I can tell the best thing i can do at this point is to install kerdi over the top? The greenboard just went up and hasn't been taped or mudded yet. When you use AquaDefense over drywall in an area that frequently experiences moisture, the drywall will be severely damaged at a certain point in the future. :laughing: I'm putting in an acrylic shower pan and plan on using Mapei Aquadefense on the walls over drywall. Yes, you can put Kerdi membrane over cement board. The shower is Dec 13, 2023 · It's OK to tile over drywall under certain conditions. KERDI TIP SHEET GENERAL utility knife. Goboard is one less expensive alternative to Kerdiboard. We would like to show you a description here but the site won’t allow us. When applying Kerdi membrane to cement board, the edges and seams of the membrane must be lapped, meaning that Dec 30, 2021 · Kerdi has been tested and approved on drywall, IIRC. We’ll walk you through every step, from selecting the right materials to applying Mar 14, 2024 · If you taped the drywall seams, here’s a big tip – apply a latex prime, like Sherwin-Williams PrepRite ProBlock, over the taped joints and allow it to dry. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. Both drywall and cement board are ‘thirsty’ – meaning they will absorb the thin-set’s moisture. Can I install Kerdi over the primed drywall or do I need to tear down the wall and put on a new backer board Can you drywall over KERDI-BOARD? So, is Kerdi safe to use on drywall? Yes! In fact, it’s advised to use this product on drywall in your bathroom before laying tile and other materials. However, you need to use a system called Schlueter over that drywall in order to waterproof the shower. 1 I don't think you'll need anything other than regular joint compound here. Jun 27, 2011 · All times are GMT -6. Apr 1, 2024 · I ‘m putting Kerdi on the shower walls over purple rock. Walls - any drywall or cementboard works. Mar 10, 2013 · Kerdi is a waterproof membrane. But with documentation certificates from Schluter the inspector says we can, but it's on a case-by-case basis. This will bond the membrane to the tub making a water tight seal. KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. For many builders, it can be confusing how you can transition between these two materials. Without a waterproof membrane like Kerdi, water and moisture can seep through grout, tile and other materials and end up damaging wood studs and subfloor. Kerdi membrane is a waterproofing material that is designed to be used in wet areas such as bathrooms and showers before tiles are installed. Aug 19, 2008 · I am finishing my basement. Mar 10, 2024 · Kerdi Board offers several advantages over traditional drywall when it comes to installation and long-term performance. A layer of paint, especially a glossy or semi-gloss finish, creates a non-porous barrier that prevents the mortar from gripping the substrate properly. It’s designed specifically for wet areas like showers and tub surrounds, where moisture can cause damage over time. When I do a shower area, I use DensArmor fiberglass wallboard & use Kerabond directly over it when installing Kerdi. It is not necessary to tape the joints between drywall panels before installing KERDI. I recommend dampening the immediate area where the KERDI will be bonded. All that said? I still put Kerdi over cement board instead of drywall, even though drywall is an approved backer for Kerdi. Because of the simplicity of the Schluter Kerdi… KERDI-BOARD is waterproof and it’s designed for installing tile of any kind on the wall. What's better? Purple or Regular White. hanging drywall plus kerdi in the shower area. Where to stop the Backerboard (Hardiebacker/Durock/Kerdi Board) in the shower and start the drywall. KERDI, which stands for Key Element Requirement for Drywall Interiors, is specifically designed to be used with drywall in shower and tub areas. Redgard is a similar product. Apr 20, 2023 · Waterproof your bathtub shower walls and prevent water damage before tiling. May 28, 2019 · This video shows a Schluter shower installation using drywall (purple board) and Schluter's Wide Roll Kerdi membrane, which allows the walls to be waterproofed without seams! We tore out an old While the mortar is allowed to slake, I apply KERDI-fix on the flange of the tub and about 1 inch above it on the drywall. Drywall is not an adequate backing material for a tile shower. DO I need to tape/mud the joints or apply a primer or can I just apply thinset to the green board drywall and tile away. With the 1/2” ledge currently and adding the 3/8” thick tile I am assuming roughly 1”-1 1/8” transition drop off (just a rough estimate with thinset maybe way off 🤷♂️). With cement board as a substrate, the key is to ensure proper installation of the membrane. In the tub surround and actually whole bathroom, some of the moisture resistant drywalls out there have a wax coating, and that can mess up the bond - just use plain drywall. Bases can be extended using KERDI can be installed over regular drywall, greenboard, or cement board. Schluter has paid for an independent testing of Kerdi membrane installed over drywall and it passes all industry Jun 15, 2023 · Kerdi board is a lightweight foam panel covered with a waterproof membrane on both sides. Tips and tricks on installing Schluter KERDI, ensuring no leaks! Aug 23, 2022 · But the problem with drywall is that it should not be used in a wet or high moisture area. Backer board can be debated, but I used drywall just because it was easier, faster and approved for Kerdi. Jun 14, 2011 · I was originally going to put up the moisture resistant drywall everywhere but I have an 8. Tile will be 12x24 porcelain 15 Wedi Michael If you’re a wedi user you can use subliner dry w As cheap as drywall is, I'd replace it with drywall and kerdi over that. No issues! If it's plaster, that's a different story. As long as you use Schluter all-set for warranty purposes, its fine to go over green board, purple board, and a few others as well. In the tub surround, if you use drywall, no need to tape and fill the seams, the Kerdi membrane will do Jan 27, 2014 · Sure, you can break the window or have wind blow a shingle off, but that's hardly likely to happen inside of a properly built shower covered in tile! Schluter has ben using Kerdi over drywall for decades, and since the certification doesn't last forever, has been getting it retested to reverify it still works to stay in compliance bi-annually. I've seen recommendations from green drywall with redguard, cement board, Dens Sheild, kerdi, shluter etc. It protects against condensation and mold, prevents tiles from loosening up and adds insulation which reduces electricity bills So now that know why you should use Schluter KERDI-BOARD let’s find out how to work with it!. To create a smooth surface, ensure that the drywall is dry and free of cracks or holes. If done according to manufacturers instructions, it will seal nicely. Conversely, a cement board is made from cement and reinforced with fiberglass mesh and other ingredients. Yes, you will need to install a waterproof membrane, such as Schleuter-Kerdi. Cheers, Wayne Apprehend the appearance of your living space by choosing this Schluter Systems Kerdi Waterproofing Membrane. Not sure if any of the liquid applied waterproofings have been tested on drywall. Over time, the drywall will deteriorate from moisture, causing your tile to sag, crack, or fall out. It provides an airtight, waterproof surface that completely seals the area to help prevent the buildup of mold and mildew. This is what I use and really like because it's very easy to install and you can hang tile right over it. Even moisture-resistant drywall (often green or blue in color) is not durable enough to withstand water exposure. Prior to this, I always considered waterproof drywall a must in the bathroom. Of course, drywall can be tiled over as long as you perform adequate prep and use the correct mortar. 5ft ceiling and can't find the purple board in sizes other than 4X8. Jan 29, 2025 · Learn effective steps to install a waterproof membrane on drywall for long-lasting protection. Learn how to waterproof drywall with step-by-step instructions. two whole walls are getting tiled. I think Schluter says you're allowed to Kerdi membrane over drywall, but I haven't seen anyone recommend it. Jun 14, 2023 · Before installing the Kerdi membrane over the painted drywall, you have to check its compatibility with the paint on the drywall. If prime then what do you recommend. If the Kerdi fails and leaks, it's not going to matter if I have drywall or backer board behind it. Purple or Green (as it's colored up here in Canada) is mould resistant which is why it is used in bathroom applications. Waterproof: Kerdi Board is completely waterproof, ensuring long-lasting protection against moisture damage and mold growth. This video shares how to avoid KERDI membrane mistakes with a step-by-step plan. Dec 6, 2024 · A contractor I had hired (no longer in business), installed purple drywall in my bathroom, then installed the alcove tub afterwardsas in the tub does not go up to/rest against the studs. Jul 22, 2025 · The thin-set mortar used to install the Kerdi membrane is engineered to bond directly with porous surfaces like unpainted drywall or cement board. I would like some feedback if any of you have tiled over the purple rigid drywall in a shower and had no issues. When it is installed properly, once you protect it with tile, no moisture penetrates it. My husband says we cannot use Kerdi waterproof membrane because the drywall is painted and unmodified thinset will not adhere. It's actually really cool looking. FWIW my drywaller refused to drywall my shower surround. I always install it over cement board or backerboard, never over drywall, even blueboard or the mold resistant greenboard. You can only use drywall IF you are using a surface applied membrane like Kerdi. Jan 11, 2012 · I'm remodeling a bathroom in my own home due to persistent nagging from my wife. Would you rather have Kerdi membrane over drywall or Kerdi board for shower walls? I was thinking Kerdi board would be better in case of a leak. etc. May 22, 2021 · Make sure you're using either green or purple drywall, both are moisture resistant, the purple is a little better. But now wondering how stiff/durable Kerdi board is compared to drywall. Yes, you can use standard taping products in the shower area. I would make sure you buy the widest trowel you can afford and simply work as much compound as possible to level the wall. Mar 29, 2009 · My carpenter put up green drywall around my walk in shower. One such option is to install cement backer board over the painted drywall instead. And the repairs will be pretty costly They all came over to my first install to check it all out. piyswuilmwamrtoabnydynimumjebbocirggjmcjisaoxddyhgwlmcuugmcyuepiqgeoabfl