How to Seal Doors When Sanding Drywall

Measure the width and height of the door. Add 8 inches to each measurement to create a border for installing the plastic.

Remove any furniture or personal objects from the the room. If you have a large piece of furniture that is too heavy or awkward to move out of the room, wrap it in plastic and tape it before pushing it aside. Lay the plastic on the floor and cut it to the proper measurements with the utility knife.

Pull the plastic up to the door and center the plastic above the door frame, with 4 inches on either side. Move the plastic so that there is 2 inches of excess plastic above the door. Tape it in place at the corners to hold it in place.

Tape along the seam at the top of the door against the jamb or the wall. Repeat this process for both sides and bottom of the door. If this is the only access into a room, do not tape it completely. Tape the top as instructed and the side of the door that is without the handle. Wrap the bottom of the plastic around a 2- to 3-foot-long wood plank and staple it into place. Push it against the bottom of the door, so the door can open in an emergency but still keep down the dust.