How to Insulate an Attached Garage

Fiberglass insulation.

Maybe you can live with the aesthetics of open, unfinished walls in an attached garage. After all, you don't have to look at them very often. However, your home will lose heat through those walls. Insulating the open walls of the garage is a relatively easy project. Fiberglass insulation comes in rolls that are made to fit between the studs of new construction, filling that space completely to block the flow of air through the walls.

Things You'll Need

• Tape measure
• Carpenter's square
• Razor knife
• Paper-backed fiberglass insulation
• Electric stapler
• Cloth gloves
• Goggles
• Dust mask

Instructions

1. Measure the open garage wall from floor to ceiling, taking the measurement from just inside the top and bottom horizontal braces.

2. Unroll your paper-backed fiberglass insulation and pull your tape measure out alongside it to the length that you measured on the wall. Lay a carpenter's square across the insulation at that distance and cut it with your razor knife.

3. Press the insulation against the wall, between the first two studs, with the paper side facing into the garage and the fiberglass side facing the wall. Staple the piece in place by shooting staples through the paper tabs on the sides of the insulation and into the sides of the studs on either side.

4. Repeat the process for the space between each pair of studs. Use your razor knife to cut the insulation away to fit around electrical boxes as necessary.

Tips & Warnings

• Wear cloth gloves, goggles, a dust mask and clothing that covers all your skin when handling fiberglass insulation.

References

• RD.com: Installing Fiberglass Insulation.