You still need a vapor barrier with cement board , although in this case the barrier can go behind the board. Cement board is heavy enough and breathable enough to take the moisture without a problem. By having the vapor barrier behind the cement board you stop the moisture going further into the wall. What should go over the cement board so it roughly matches the finish on the drywall in the rest of the room?
You can use joint compound but ordinary joint compound dries by evaporation, so if you need a thick application it will take a long time to dry and will develop cracks while it sets. The joint between cement board and greenboard is similar to the joint between two pieces of cement board or two pieces of drywall.
Plan the installation so the last column of tiles overlaps the joint between the cement board and the greenboard if possible. Mix the thin-set mortar according the instructions on the bag. If you 're working with new drywall , there's no need to tape the drywall joints.
Seal the walls with a skim coat and let it dry thoroughly. Sand with a medium-grit sandpaper to create a uniform surface that's not too smooth. You want the tile adhesive to have something to grab onto. How do you seal durock seams? Category: home and garden indoor environmental quality. How do you prepare durock for tile? Can you use drywall mesh tape on cement board? Is Thinset waterproof?
Can you use drywall screws on cement board? Can durock get wet? How do you paint durock? What's better Hardie board or durock? Can Backerboard get wet? How do you waterproof drywall? Do you have to seal backer board? What is the best backer board for a shower? Tile Backer Board Breakdown. Foam boards are lightweight, easy to cut, and a completely waterproof.
Is Hardie backer waterproof? Why tape a Hardibacker seam? Do you need a vapor barrier behind cement board? Offset the interior screws so they are staggered with the outer screws, and make sure no screws are closer than two inches from the edge. To install CBUs, they must be attached to the substrate with nails, screws or staples every four to eight inches in both directions. Ceramic and stone tile installations require the backer boards to be installed into a bed of thinset mortar at the same time.
Place cement board with joints staggered from subfloor joints. Cement board has a smooth side and a rough side. Face the rough side out if you will be using thin-set mortar adhesive to install the tile but the smooth side out if you will be using latex mastic. Your email address will not be published.
Save my name, email, and website in this browser for the next time I comment. Home Learn. The joints between the sheets should be offset by the joints in the plywood or other subflooring by at least 8 inches, for maximum floor stiffness. If necessary, plan to start the first row of sheets with a partial sheet to create the offset. Mix a small batch of thin-set mortar as directed by the manufacturer, mixing the dry powder with water in a bucket.
Cover an area just large enough for the first cement board sheet. Place the first sheet over the mortar bed.
The rough or embossed surface of the sheet should face up, as applicable. Fasten the sheet with cement board screws, using a drill-driver, making sure the screws are flush with the surface of the sheet or are slightly recessed.
Space the screws 8 inches apart across the entire sheet. Use only cement board screws and alkali-resistant cement board joint tape. Standard screws and drywall joint tape will corrode or deteriorate from contact with cement board. Continue installing sheets to cover the entire area. Mix fresh mortar only as it's needed to prevent it from drying before you can use it up. Apply cement board joint tape to all of the joints between sheets, adhering the tape with its self-adhesive backing. Mix more thin-set mortar and, using a drywall knife, cover the taped joints with a thin layer, much as you would do when mudding drywall joints.
Tool the mortar with the knife so the tape is covered and the joints are flat and smooth. Allow the mortar to cure completely, following the manufacturer's recommended drying time. Installing cement board on countertops is very similar to the process used on floors, but countertops usually need an additional strip of cement board along the exposed edge of the countertop. This creates the built-up edge for securing bull-nose or other forms of edge tile.
Cement board on walls also uses the same techniques, but in this case, there is no layer of mortar behind the cement board as it is screwed directly into the wall studs.
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