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.
Simply so, Can you use joint compound on cement board? When using drywall compound over cement board, it is recommended, but not required, to use a faster setting-type joint compound (45 or 90 min), than typical joint compound. Make sure to follow manufacturer guidelines for the products used to finish the non-tiled area.
What do you do with a gap between tub and cement board? Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. silicone). Although some say you should have weep holes along this gap so any water behind can weep out into the tub.
Subsequently, Can you tile over old cement board?
If the boards appear to be in good shape and firmly adhered to the floor, you can re-use the old backer boards for your new tile installation. However, you still need to prepare the boards for installation, taking them back down to the bare cement board.
Do I need thinset under cement board?
Not only is thinset a critical component underneath cement board but the other critical component is the fasteners. And you won’t have the fasteners if you are trying to install it over concrete. On the bright side, there are some options for concrete subfloors.
Can I use thinset instead of joint compound? Edit: if it’s just a few gaps in a completely dry area you can use joint compound. Thinset doesn’t take texture like drywall and is noticeable if you dont keep it neat.
Does it matter which side of cement board faces out?
No, it doesn’t matter. Regardless of which side faces out during installation, you can expect the same great performance that has made USG Durock® Brand Cement Board the preferred choice of professionals and do-it-yourselfers for decades.
What do you put 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).
How do you install cement board around a bathtub?
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. Apply it to the wall with the bottom edge about 1/4 in. 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.
How do you seal cement board in a shower?
Do you have to remove cement board before tiling?
Undamaged cement backer board does not need to be replaced. … It is difficult to remove tile from a cement backer board, and even more difficult to avoid damaging the board in the process. Since backer board is relatively inexpensive, it’s not normally worth the time and labor it would take to remove the tile to save it.
Do you need to waterproof cement board? Most concrete backer-boards on the market today are not water-resistant, but all are waterproof. Since many people confuse the terms, it is a common misconception that this is the best material for use inside a shower or tub area.
How do I get rid of Barker board?
Do you have to tape seams on Hardibacker?
For tile backer boards such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali-resistant mesh tape.
Do I need plywood under cement board? Because cement board can be used either for floors or walls, the surface below the cement board will vary: Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB).
Can you use 1/4 inch cement board on floors?
Floors. Both 1/4- and1/2-inch cement board are appropriate for floors. To install cement board on floors, cement board manufacturers mandate a 5/8-inch plywood subfloor or OSB underlayment. They also require a 3/4-inch subfloor where tile size exceeds 12 inches.
Will Redgard stick to joint compound?
Redgard peels right off my joint compound. I did prime properly (4:1 water to redgard mix painted over all surfaces), but it has no effect – probably because my joint compound is « dusty », that is, the top layer is a bit powdery (never been a problem with paint). All drying times/manuf.
Can you tile over durabond 90? Gypsum Panels
Spot fastener heads at least once with DURABOND 45 or 90 joint compound. In areas not to be tiled, embed tape with DURABOND 45 or 90 joint compound in the conventional manner.
Can u tile over drywall?
You can tile over drywall in areas that are not exposed to excessive moisture, and it is safe. It is not safe to tile over drywall in areas that are exposed to wetness like in the shower. Water in these areas can eventually seep behind the tile and cause damage, mold, or pest infestations.
Can you hang cement board vertically? Boards may be installed vertically or horizontally. Edges of the board parallel to framing must be supported by a structural framing member. Score and snap boards to required sizes and make necessary cutouts. Attach the HardieBacker® Cement Board with HydroDefense™ Technology.
Do I need to seal cement board before tiling?
To Seal or Not To Seal
For the floor and sides of showers, as well as tile floors in other areas of the home, using a membrane underneath the backerboard may be your best bet to make absolutely sure moisture doesn’t get through to the studs underneath.
Do you need to pre drill cement board? Fiberboard cement siding can be hand-nailed, but because it’s so much harder and more brittle than wood, you have to predrill holes near any edge. You can save yourself a bunch of time by using a pneumatic coil siding nail gun.
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