Step 6: Cut wallboard to fit
To cut a remaining section of wallboard, mark the measurement on the face of the wallboard. Using a straightedge as a guide, score deeply along the line with a utility knife. Turn the board so that the uncut back face is facing you and pull the wallboard back away from the cut. Once the board snaps, use a utility knife to cut the paper along the fold. Use a utility knife to knock off any high points or lightly sand with a coarse-grit sandpaper for an even edge. Butt the section against the previous board and screw in place.
 Use a utility knife and straightedge to score a deep cut along the marked line on the face of the wallboard.
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