Can You Sand Down a Bump in Drywall?

General Information

• Drywall is installed after the framing for a room has been completed. It helps provide the foundation for your walls. Bumps may form in the drywall for several reasons during the installation. Nail holes, seam tape and excess joint compound in an area can all cause bumps to form. These bumps can be sanded down, but you will need to complete other portions of the job to get the flat surface you want for your walls.

Sanding

• You can remove many bumps in your drywall by sanding them down. Use a drywall sander that resembles a trowel and apply light pressure to the bumps. Use 120- or 150-grit sandpaper for the best results. Bumps are more likely to occur near seams between your drywall, so pay particular attention to these areas. If the bump forms near a corner, use a sanding sponge instead.

Joint Compound

• After sanding down the bumps, you will need to apply one or more layers of joint compound to the drywall. Use a trowel and apply a layer of joint compound. Let the compound dry. You will need to sand down any bumps or ridges so your wall is flat. Add another layer of compound and sand again.

Drywall Tape

• Drywall tape will prevent your drywall from cracking. Add a thin layer of joint compound to the wall where you will apply the drywall seam tape. If any bubbles appear on the tape, smooth them out with your fingers. Add the tape to the wet joint compound and then cover the tape with another layer of joint compound. Let it dry and then use a taping knife along the seam to remove any bumps. You will need to add at least two more layers of joint compound. Sand down the compound on the last layer.