Install a James Hardie Backerboard
Installing HardieBacker Board is similar to installing any foundation for tile. With a few tools and some know-how you can prepare a sturdy, moisture-proof base for tiled bathroom shower walls, tub surrounds, kitchen countertops and floors. HardieBacker Board is a proprietary cement-formula, mold-resistant, backerboard for tiles used in high-moisture applications. Also called Hardieboard, it has replaced old-fashioned gypsum "green board" as the material of choice as a tile backer. According to the company, HardieBacker cement board does not contain any glass fibers, gypsum, asbestos or formaldehyde.
Instructions
Cutting the Board
1. Measure the size board needed with a tape measure. Remember the advice of skilled craftsmen to "measure twice, cut once." Place the board on a stable surface. Do not cut hardboard indoors with high-speed power tools such as saws or grinders. Doing so will generate excessive silica dust, which is a health hazard.
2. Score the face of the board with a carbide-tipped scoring knife or utility knife, using the straight edge as a guide. Heavy shears may be used instead. Snap the board upward along the score line to separate it.
3. Score around the edge of cutouts or small holes and use the hammer on the face side of the board to break out the areas. You may have to score the cutouts several times to get them deep enough to break. Be careful of snapping the knife blade.
Countertop Installation
4. Secure and level the cabinets. Place 1/2-inch-thick exterior-grade plywood supports across the cabinet base. Supports can also be made of 1-by-4 boards or similar material. Space the supports so that there is a maximum of 16 inches from center to center, referred to as 16 inches on center.
5. Design the layout of the Hardieboard, ensuring it does not align with plywood joints. Leave a 1/8-inch gap from the edges of the plywood. Cut the boards to size and make cutouts as necessary.
6. Attach the HardieBacker to the countertop with dry-set mortar, thinset or mastic according to the instructions. Secure with nails and screws every 8 inches over the entire board, keeping 3/8 inch from the edges and 2 inches in from the corners.
7. Fill the board joints with the material used to set the tiles. Use a 2-inch-wide, high-strength, alkali-resistant glass fiber tape to cover the joints. Embed it in the mortar and level the surface to prepare for tiling.
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