Tape-Measure Rip Gauge
Rip sheet goods to width with nothing but a tape measure and a utility knife — the tape sets the width and rides the edge as a fence while the blade scores against its hook.
Hang Drywall Long and Back-Score It at the Corner
Technique: Back-Scoring Drywall at a Corner
The Problem
Cutting drywall to die into a corner means measuring the wall, transferring the number to the sheet, cutting on the floor, and carrying it up hoping the framing is where the tape said it was. It usually isn't, quite. A sheet cut a quarter-inch long has to be forced, and forcing it crushes the edge or tears the face paper right where the corner bead or tape has to sit — the one place a torn edge shows through the finish.
The Technique
Cut it after it's on the wall, using the framing itself as the measurement.
- Hang the sheet with the excess running past the corner rather than cutting it to length first. Fasten it off on the field, leaving the overhanging portion unfastened.
- Reach behind the overhang and run your knife along the back of the sheet, following the corner of the framing. You're cutting the back paper and into the gypsum, not through the face.
- Snap the waste back. The sheet breaks cleanly along the score.
- Cut the face paper along the fold to release the offcut.
The cut lands exactly on the framing because the framing is what guided the knife. Nothing was measured, so nothing was measured wrong.
Pro tip: Scoring from the back is what protects the finished side. A face-side cut leaves the torn paper edge on the surface you're about to tape; a back-side score puts the ragged edge behind the sheet where nothing has to be done about it.
Safety note: You're running a blade toward your own hand behind a sheet you can't see through. Keep the hand steadying the overhang well clear of the blade's path, and use a fresh blade — a dull one needs pressure, and pressure is what makes a knife skip off a stud and keep going.
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