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Installation Installation Installation Guides. All Ceilings. Sheathing Sheathing All Sheathing. The Only Wallboard Specifiable for Sustainability. All Walls. Ceramics Ceramics All Ceramics. All Industrial. You will need to cut your cement board to various sizes to suit your project, and knowing how before you start your project can keep you from making costly errors.
You can cut the cement board with a utility knife and a T-square. Score the cement board deeply with two or three passes with the knife, using the square to ensure a straight line, then snap the waste area of the sheet back to break the board along the cutting line.
Cut the fiberglass mesh along the backside of the board, as applicable, to complete the cut. To make round or curved cuts, use a jigsaw with a carbide blade or a drill and a hole saw bit. Make a rough plan for the cement board sheet layout, based on the area to be covered and the size of the cement board sheets.
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.
Consult the cement board manufacturer for recommendations on using a moisture barrier between the board and the wall studs. This may be thick plastic sheeting or another type of water-resistant membrane. Actively scan device characteristics for identification. Use precise geolocation data.
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