What Grade of Sandpaper Do You Use When You First Start Sanding Drywall?

Drywall

• The boards that make up most interior walls in homes are drywall or wallboards. Joint compound and tape secures the boards -- typically 4-by-8-foot panels -- together to form walls. Sanding and painting provide the finishing touches that transform drywall from unfinished panels to smooth wall surfaces.

Sandpaper Grit

• The term “grit” refers to the abrasive particles per square inch of sandpaper. Number grades specify the abrasiveness of the sandpaper, with the smaller numbers being more abrasive than are the larger numbers. While grits range from 12 to 600, the typical grades you use for drywall surfaces are in the medium range from 80- to 120-grit sandpaper.

Sanding Drywall

• The joint compound used to secure the drywall pieces and tape needs to dry fully before you begin sanding. Use medium 80-grit sandpaper for the initial sanding of the drywall surface, and employ a sanding machine or hand-held pole sander. Use a sanding block for the corners and the pole for the larger surfaces. Use gentle motions when you sand so you only smooth rough spots and do not sand down to the tape.

Considerations

• Check the joint compound instructions when choosing the specific medium-grade sandpaper when you first start sanding drywall. Different drywall compound manufacturers may specify the particular grade of sandpaper. Wear protective eyeglasses and a dust respirator when you sand drywall.