Do-It-Yourself Home Insulation for a Wall

Locate your wall studs with a stud detector. As you run the detector over your walls, a low beep will sound or a light will illuminate. Mark your studs with a marker or piece of tape so that you can find them again. When insulating outside walls, remove the siding first.

Drill small holes into interior walls between every set of studs. Space the holes three feet apart, and make the last hole eight inches from the ceiling. The holes should be the same diameter as that of the tube on your foam container. Make sure your electricity is shut off to avoid electrocution from wiring. Exterior wall holes are drilled with a hole drill bit at the halfway mark between all studs.

Place the tube on your container of foam into the bottom hole, and insert a plastic straw in the next hole up. Press the nozzle, and fill your wall with foam until it reaches the plastic straw. Then move up, placing the straw into the next hole above. For outer insulation, insert the blower's nozzle into the bottom exterior hole, and spray until it is filled.

Scrape excess foam off of your interior walls with a putty scraper. Exterior overflow may require you to saw off the excess insulation with a foam saw.

Putty over holes in your interior wall, and and scrape off the excess with your putty knife. Sand rough edges after the putty dries, and paint your walls. Plug exterior walls with a plastic or wood plug cut to the diameter of your fill holes. You may glue plugs into place for additional security. Once glue is dried, replace the siding.