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Backer board is a durable material that provides a sturdy surface for attaching the brick, mortar and stone exterior. The face of the cabinetry is covered first so the backer board covering the top pieces can extend over the edges of the vertical pieces. Since backer board is also heat and water resistant, also use it for lining portions of the cabinets. Its heat-resistant properties make it a good lining for the shelves that will house the grill and side-burner. The back interior of the cabinet and the floor under the sink are made more water resistant by applying backer board to them. Important: Backer board must be attached so the rough side is facing out. The rough texture forms the surface that will come into contact with the masonry work.
Cut backer board using an electric circular saw and heavy-duty masonry blade (Image 1), matching the backer board to the plywood surfaces of the cabinet unit. Once the pieces are cut, place the backer board (Image 2).
Secure the backer board with screws just as you did the plywood.
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