How to Inject a Foam Material Into a Block Wall

Energy efficiency is absolutely essential in times of increased fuel prices. Windows, doors and other openings are the most obvious places around your home where your precious heating dollars can escape. A hollow block walls is a not so obvious escape point. Blocking this point is essential for maximum efficiency in your home. Filling the blocks is the way to seal your home. The only way to fill up the blocks is to breach the wall and inject foam inside.

Spray paint
Hammer drill with 5/8-inch masonry bit
Expansion foam
Concrete patch
Putty knife
Work gloves
Safety glasses
Dust mask
Hearing protection
Face shield

Instructions

- 1
  Place a spot of paint in the center of every section of every block in the wall. These marks will help you to drill every spot without stopping to clean away the dust the drill bit will make.
- 2
  Turn on your hammer drill. Set the speed at its fastest setting. Engage the hammer function. Place the tip of the 5/8-inch masonry bit against the wall and drill through each mark.
- 3
  Open a can of expansion foam. Twist the tube onto the nozzle of the can. Turn the can upside down and shake it vigorously for 90 seconds. Place the tip of the tube into each hole in the wall and fill them all with foam. Change foam cans as necessary to fill all of the blocks with foam.
- 4
  Open a can of concrete patch. Press concrete patch into every hole in the wall and scrape off the excess with the tip of your putty knife. Let the patches cure for 72 hours.
- 5
  Inspect the wall. Add more concrete patch to any areas that are open or sunken. Let the touch-ups cure for 72 hours and inspect the wall again.

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