Measure and mark the cut line with a pencil or utility knife
Score the board along the line with a carbide-tipped scoring tool or utility knife
Snap the board along the scored line
Cut through the mesh or fiberglass backing with a utility knife
Use a jigsaw with a carbide blade for curved or detailed cuts
Use a circular saw with a fiber-cement blade for long straight cuts
Use a grinder with a diamond blade for small or precise cuts
Wear a dust mask, safety glasses, and gloves
Cut outdoors or use dust control if possible
Smooth rough edges with a rasp or sandpaper
Support the board firmly while cutting