Drywall Installer how-to
How to Tape and Mud a Seam
Finishing seams is a skill that improves with every wall.
Quick answer
Finishing seams is a skill that improves with every wall. In short: fill; apply; embed, then complete the remaining steps below.
Step by step
Fill any large gaps with setting-type compound and let it harden.
Apply a thin layer of compound over the seam with a 6-inch knife.
Embed paper tape into the compound and wipe out excess mud.
After drying, apply a second, wider coat with a 10-inch knife.
Apply a final coat with a 12-inch knife, feathering the edges.
Sand lightly with fine sandpaper or a sanding sponge and check with a light.
Safety reminders for drywall installers
- Lift panels with a partner or a lift to protect your back
- Use scaffolds, ladders and stilts correctly
- Control dust with vacuum sanders and wear a respirator
- Protect your eyes when cutting and working overhead
Key terms
Gypsum board · Type X · Moisture-resistant board · Joint compound · Corner bead · Butt joint: see the full drywall installer glossary.