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Does cement board go over tub flange?
ANSWER – No there should not be a gap between the top of the bathtub flange and the backer board on the wall. The backer board should overlap the tub flange so the tile has a stable backing to attach to. This requires shimming the backer board out from the studs so the wall is plumb.
Do you need to waterproof cement board?
Hardiebacker (James Hardie): the use of a waterproof membrane, vapor barrier or vapor. retarding membrane is optional unless the local building code requires it.
Does cement board sit on tub?
The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area. above the lip of the tub. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in.
Do you need put plastic behind cement board shower?
plastic behind cement board with waterproofing is essentially suspenders when you already have a belt. the waterproofing is also a vapor retarder so if the red guard or kerdi product is continuous, lapping corners and all, the plastic will be unnecessary.
How do you attach cement board?
Drill a small hole in one end of a scrap of wood, attach it to the cement board at the center of the circle, screwing through the cement board into the work surface below. Then screw in a “cutter” screw where you want the circle to be scored, for example, 2 in. from the center for a 4-in. hole.
Do you need thinset under cement board?
Using thinset under cement board is a commonly skipped step amongst many contractors. Proper installation would be to follow the manufacturers installation instructions for applying cement board to a subfloor. Thinset is going to create a solid surface under tile and prevent flexing that could lead to cracking.
Do you need to tape cement board before tiling?
If you are going to tile over the cement board, you should tape the seams. This should not be that difficult. Pack in thinset, lay on the tape, and flat-knife to get it set in. In the corners, use a corner knife.
Do you leave a gap between cement board?
Leave a 1/4-inch gap between the backer board and the wall. Leave a 1/8-inch gap between each backer board sheet. The corners and edges of the sheets should not touch one another.
Do you have to waterproof cement board before tiling?
Contrary to popular thought, tile and grout are not waterproof, and some moisture will penetrate even if sealant is used. However, if you choose to use concrete backerboard, which is much stronger and more durable than gypsum board, a water vapor membrane must be placed underneath it or a sealant applied on top of it.
Do you need to use RedGard over cement board?
You really don’t need the RedGard, but the more protection the betterso go for it. And yes, you can do the boards beforehand. But, hit the filled seams & screws (your weak points) as soon as a panel is ready to give it some time to setup.
Is Durock cement board waterproof?
Even though water will not affect USG Durock® Cement Board with EdgeGuard, the board alone is not waterproof. If waterproofing is desired, apply a waterproofing membrane such as USG Durock™ Waterproofing Membrane or USG Durock™ Liquid Waterproofing and Crack Isolation Membrane over the cement board.
What goes behind cement board in shower?
Unless specifically manufactured as a waterproof product, cement board is water resistant but not waterproof. You must coat it with a fluid-applied waterproofing or apply a water-resistant barrier behind it that drains (BSC 2009b).
Do I need to tank HardieBacker boards?
Once HardieBacker has been installed in a wet room you will need to tank the area to ensure the room is fully waterproof. Various methods, such as a liquid membrane (BAL Waterproof Plus Kit, Laticrete Hydro Han) or a matting system (Topps Waterproof Matting) can be used and should be applied before tiling.
Do you need a vapor barrier with Hardie board?
Depending on your local building authority having jurisdiction (the AHJ) over your building codes, vapor barriers are almost always required, whether your builder uses James Hardie products or some other, inferior product.
Do you put grout between tub and tile?
Grout or Caulk Between Floor Tile and Tub: Which Is Better? Since you are joining two different materials together, you should use caulk in the space where the floor tile and tub meet. Grout is not flexible, so it’s not the best material for the job, while caulk allows for movement and also provides a better sealant.
Can I just screw down cement board?
Screw and Joints Do not use drywall screws as they are not recommended to be used to hold the backer board in place. All of your backer board pieces should be cut before they are placed on the floor. It is important to highlight that screws shall not be installed all the way down to the floor joists.
Can you use cement board in a shower?
Cement boards can be used in a shower because they can be exposed to water and moisture without warping, rotting, and deteriorating. It also does not promote the growth of molds and mildew. Cement boards are also a good substrate to use for tiles, which are commonly installed in showers as well.
How thick should cement board be for shower walls?
Walls: Use 1/2-inch or 5/8-inch-thick cement board, not 1/4-inch. The extra thickness is needed when spanning the studs and it provides a solid base for the tile.
