Nor will they tell you how to tile over it, or what color grout to use. Now days in my own home I do use Redguard even though just cement board will outlast me. Not every wall does. Over concrete, you don’t want to use cement board. If there are any cracks in the floor, you need to use some sort of a membrane. You could use a foam board like Wedi or a leveling compound. If you … Serrated Flat Head Star Drive Cement Board Screws (185-Pack) $7.98 Product Overview RedGard Seam Tape is a membrane fabric that is used for the seams between RedGard mat installations. Applying RedGard will block out moisture and yes, you would then need to use a polymer modified thinset. Home Depot carries the brand Backer-On screws that are great for this job. We like to keep all the questions for the same project on one. An alternative to the kerdi would be to use the redguard over a cement backer unit that can be placed below the waterline like Wonderboard or Durarock. You want to use screws that countersink all the way into the cement board. Do we need to apply RedGard over it or would it be an overkill? James Great website and guides, Roger. And … You will also use it to attach the tile to the backer board. The only place it’s OK to use it is when tiling in non-wet areas, over drywall, with small ceramic tile. The cement board should be plumb, hence the need for shims sometimes. Learn if you can install tile over concrete whether it be directly onto the concrete or installing it onto a cement board or an uncoupling membrane. Take a trowel or a taping knife and use it to apply the thinset to the gap. Then, the cement board is installed on top of You could use a foam board like Wedi or a leveling compound. If it’s too large to fill with caulk it’s too large to fill with redgard. All other samples will be full size and paid for. Cement Board and Plastic Sheeting In this highly convenient, inexpensive, and popular application, a moisture barrier of 4- or 6-mil-thick plastic is installed directly over the wall studs. Do not use WonderBoard® Lite as a structural load bearing member. Hi, I am re-doing my shower. HardieBacker® Cement Board with HydroDefense Technology provides the unmatched strength, ease of use, and excellent tile adhesion you’ve come to expect from HardieBacker®—now with a waterproof composition throughout Rock-On #9 x 1-1/4 in. Finally, it must be well adhered, if not you need to start over. Question 1: Will I need to use some sort of shim between the backside of the HardieBacker Cement Board (.42″ thick) and the wall studs so that the front side of the HardieBacker Cement Board is on the same plane as the front Unless you meant ‘can I tape the gap and use redgard over it’, in which case the answer is yes. I also read that DensShield backerboard has a waterproof layer over gypsum core. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. Hi lads, this is following on from my post the other night where i have decided to use hardie cement boards instead of plywood due to the poor quality of ply now available. You could go with kerdi over cement board, you will need an expert to tell you if this is better then kerdi over drywall, though i will guess its unnecessary. You need to make sure that the entire gap between the boards is filled up with the thinset. When screwing the cement board down, space them about 16 inches apart . From what I read in the posts on backerboards in GBA I see several comments on how well RedGard membrane is performing for the shower and tub areas. Either you use a vapor barrier behind the hardi, or you can use a waterproofing system (like redgard) over the hardi, but you should not do both. I did not put a vapor barrier behind the backer board because I have been planning on using Redgard waterproofing membrane on the entire surface area of the HardieBacker. But the application is pretty easy. Yes, you can redgard over the seam at the floor, and yes, you should install redgard over all the cement board if you don’t have a barrier behind it. Cover the tub with plywood and tap a flat bar behind it - you may be Tip Before tiling your shower, you'll have to remove any existing drywall and replace it with cement backer board. Please consider joining my Patreon network. The RedGard was supposed to be compatible with cement board, but the manufacturers instructions did not specifically mention HardiBacker, so I called both Custom Building Products and Hardie, and they both said 'should be I got two gallons at Home Depot yesterday. They'll just tell you how to hang their product. We rolled the RedGard on the cement You can choose which samples are free in the checkout. 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