Cutting cement board is an important skill for anybody 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 hardwood backer but also requires special care when cutting. Unlike regular drywall, cement board can dull tools quickly and generate harmful dust if not handled properly. Prior to starting, it's important to truly 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 important to safeguard yourself from airborne fibers and debris.

The most simple method for cutting cement board is the score-and-snap technique. Start with marking the cut line with a pen and a direct edge. Utilizing a carbide-tipped scoring knife or an energy knife, firmly score across the line several times to create a deep groove. Once adequately scored, place the cement board over a company surface just like a workbench with the groove aligned at the edge. Apply downward pressure to snap the board cleanly over the line. While this technique is best suited 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 complicated cuts, such as for example 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 helpful for cutting shapes or curves. If you're utilizing a circular saw for straight cuts, opt for a knife created specifically for fiber cement board to avoid rapid wear and excessive dust. When utilizing power tools, always cut outdoors if at all possible or use dust control methods such as a vacuum attachment. Wetting the board lightly before cutting also can reduce airborne particles. You should 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 task ensures a much better fit and cleaner finish, especially in visible areas. Clean off any dust and debris before installation to promote 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 allow for expansion and contraction. Properly cutting and installing cement board not only ensures structural durability but also enhances the longevity of your tiling or wall finish.