Project details
Skill
5 out of 5HardSpray-foam installation is best left to the pros
Cost
About $600 to $800 per 100 square feet
Estimated Time
4 to 6 hours
In this video, This Old House general contractor Tom Silva shows how to super-insulate an attic.
Steps:
1. Apply closed-cell spray foam insulation to the underside of the roof sheathing, filling the spaces between roof rafters.
2. Once the foam cures, use a reciprocating saw to trim the excess foam flush with the rafters.
3. Cover the insulated attic roof with ½-inch-thick drywall.