Step 3 Pre-coat corners heavily and lay fiberglass mesh tape that is 6 inches wide into the wet RedGard to reinforce the transition. You will also use it to attach the tile to the backer board. James Great website and guides, Roger. After the insulation is in place you will want to add a vapor retarder, sometimes called a vapor barrier, if you need one. Installing Tile Directly on Concrete Ceramic and porcelain tile are so frequently installed at or above grade level on a cement board underlayment or directly on plywood that it almost seems novel to install tile directly on concrete. The only place it’s OK to use it is when tiling in non-wet areas, over drywall, with small ceramic tile. I have actually heard of people using tarpaper for this, but I chose to use RedGard. You absolutely need to include some sort of substrate (cement board, green board, regular drywall) with the Schluter-Kerdi waterproofing kit. Applying RedGard will block out moisture and yes, you would then need to use a polymer modified thinset. Finally, it must be well adhered, if not you need to start over. Use a drill fitted with a mixing paddle to mix the thinset. Always add the dry thinset mix to the water — not the other way around. If the area behind the backerboard must be kept dry, use RedGard® Waterproofing and Crack Prevention Membrane or Custom® 9240 Waterproofing and Anti-Fracture Membrane 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 Hope this helped. Nor will they tell you how to tile over it, or what color grout to use. Take a trowel or a taping knife and use it to apply the thinset to the gap. Do not use WonderBoard® Lite as a structural load bearing member. Hi, I am re-doing my shower. Please consider joining my Patreon network. The waterproof membrane isn't … We like to keep all the questions for the same project on one. If you … You could use a foam board like Wedi or a leveling compound. 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 If it’s too large to fill with caulk it’s too large to fill with redgard. I got two gallons at Home Depot yesterday. 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. 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. Definitely use cement board instead of green board. If there are any cracks in the floor, you need to use some sort of a membrane. The contractor will have to buy a 1 gallon bucket and follow the directions for your particular situation. You can order up to 3 FREE cut samples (10cm x 10cm) at a time. If you are not sure if you need insulation in your walls follow along with this flow chart. All other samples will be full size and paid for. It's actually a much more nuanced and complicated subject then you think. Even if you use a waterproof underlayment membrane, the floor will still be either 1/4″ or 1/2” higher 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. I also read that DensShield backerboard has a waterproof layer over gypsum core. 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. 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 to breath. But the application is pretty easy. I suggest shimming the studs (only if you have to) to get the cement board down over the tub lip. I have the HardiBacker board up and the seams are taped and mudded with alkali resistant mesh tape and thin-set. We chose DensShield for its better environmental attributes. If you want to use a backer board with a built in moisture barrier than you should use DensShield by Georgia-Pacific. Over concrete, you don’t want to use cement board. The cement board should be plumb, hence the need for shims sometimes. I think this product is expensive, But even though the tile experts that taught me methods of redoing a bath surround, say that you do not need to waterproof the cement board they could not be more mistaken. Not every wall does. Unless you meant ‘can I tape the gap and use redgard over it’, in which case the answer is yes. It's all about the 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. WonderBoard® Lite is not a waterproof barrier. 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. GBA Editor Martin Holladay | Jul 26, 2015 06:53am | #3 Yasir, Kerdi-Board . Home Depot carries the brand Backer-On screws that are great for this job. I put up many walls with nothing over 20 years ago, they are still there. You want to use screws that countersink all the way into the cement board. No, you’ll need to tape and mud it, then use redgard over that. Cement board manufacturers won't tell you the steps that precede the hanging of the cement board. Mix the thinset as if you’re mixing batter. You can choose which samples are free in the checkout. Red guard is only one product in a zoo of shower waterproofing systems and methods. How to Waterproof Cement Board around a bathtub. Then, the cement board is installed on top of :goodluck: muskymike 12-05-2005, 09:13 AM Hi Neil, I merged your threads together. You need to make sure that the entire gap between the boards is filled up with the thinset. Rock-On #9 x 1-1/4 in. 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. Do we need to apply RedGard over it or would it be an overkill? A . 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. However, I have been hearing that Redgard does not work well with HardieBacker … Tip Before tiling your shower, you'll have to remove any existing drywall and replace it with cement backer board. While it might sound like a good idea to install cement backer board over drywall before tiling the shower, the reality is that the drywall should be removed beforehand in most instances. And … The other option was to 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 You could use a foam board like Wedi or a leveling compound. Cover the tub with plywood and tap a flat bar behind it - you may be When screwing the cement board down, space them about 16 inches apart . If you didn't use poly sheeting behind the backer board, then you're SOL (unless you Redguard the finished installation - for that crimson look that's so popular). They'll just tell you how to hang their product. While I prefer using 1/2” cement backer board over a plywood subfloor, you may be able to get by with 1/4” backer board instead. The best way to get rid of the glue is to grind it off with an electric grinder and a diamond cup wheel. How to Install Wall Tile Over Backer Board. 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. Now days in my own home I do use Redguard even though just cement board will outlast me. We rolled the RedGard on the cement It won’t hurt to use RedGard on all the cement board. Backer board is installed as underlayment for the tiles to prevent moisture from damaging the walls and to create a … Use a roller extension pole to help you cover hard to reach areas is needed. 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. 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