Score a Straight Rip by Swiping Your Tape Measure and Knife Together
The Problem
Ripping drywall to width means putting a straight line down an eight-foot sheet. Marking two points and snapping a chalk line works, but it's slow when you have a stack of sheets to cut, and a straightedge long enough for the job is one more thing to carry. Drywall hangers solve this with nothing but the tape and knife already in their hands.
The Technique
- Pull the tape out to your rip width and hold the tape body in one hand, with a finger or two hooked over the edge of the sheet. That finger is your fence — it rides the edge and keeps the distance constant.
- With your other hand, hold the utility knife blade tight against the tape's hook.
- Keep the fence finger pressed to the edge and drag both hands down the sheet together, letting the blade score as it goes. Adjust the tape in and out before you start until the blade lands exactly where you want the line.
- At the end of the run, snap the sheet along the score and cut the back paper.
The same grip works with a pencil at the hook instead of a knife — a fast way to mark a parallel line on plywood or to scribe along an edge.
Pro tip: On long or repeated rips, the fence finger sliding along the sheet edge builds up friction heat. A wrap of tape or a bandage over that fingertip lets you keep the pace without burning it.
Safety note: Your fence hand and the blade travel together, a fixed distance apart. Keep that spacing — if the blade snags and jumps, you want your fingers on the edge of the sheet, not on the face in its path.