Cutting cement board is an essential skill proper tackling home renovations involving tiling, drywall replacement, or waterproof installations in areas like bathrooms or kitchens. Cement board is a durable, water-resistant material manufactured from cement and fiberglass mesh. Its rigid nature causes it to be ideal as a tile backer but additionally requires special care when cutting. Unlike regular drywall, cement board can dull tools quickly and generate harmful dust or even handled properly. Before you begin, it's important to have the right tools and safety gear. Common tools for cutting cement board include a carbide-tipped scoring knife, circular saw with a cement board blade, utility knife, jigsaw, or angle grinder. Safety goggles, gloves, and a dust mask or respirator are necessary to protect yourself from airborne fibers and debris.

The most simple method for cutting cement board could be the score-and-snap technique. Begin by marking the cut line with a pencil and a direct edge. Utilizing a carbide-tipped scoring knife or a power knife, firmly score along the line repeatedly to produce a deep groove. Once adequately scored, place the cement board over a firm surface such as a workbench with the groove aligned at the edge. Apply downward pressure to snap the board cleanly over the line. While this technique works best for straight cuts on thinner boards (typically ¼ inch), it's efficient, produces minimal dust, and requires fewer power tools—well suited for small projects and DIYers.

For more complex cuts, such as curves or holes for plumbing and electrical outlets, power tools like jigsaws, rotary tools, or angle grinders may be necessary. A jigsaw fitted with a carbide-grit or diamond-grit blade is especially ideal for cutting shapes or curves. If you're utilizing a circular saw for straight cuts, opt for a knife specifically made for fiber cement board to prevent rapid wear and excessive dust. When working with power tools, always cut outdoors if possible or use dust control methods such as a vacuum attachment. Wetting the board lightly before cutting can also reduce airborne particles. Just be mindful to not soak the board, as excessive moisture can compromise its integrity  How to Cut Cement Board.

After cutting, edges may appear rough and require light sanding with a masonry sanding block or rasp to remove splinters or unevenness. This step ensures a much better fit and cleaner finish, especially in visible areas. Clean off any dust and debris before installation to market better adhesion if you're applying thin-set mortar or tape. When attaching cement board, always follow the manufacturer's guidelines, using corrosion-resistant screws and spacing them correctly. Remember to leave a small gap between sheets to accommodate expansion and contraction. Properly cutting and installing cement board not merely ensures structural durability but additionally enhances the longevity of one's tiling or wall finish.