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How to Prevent Ice Dams

This Old House general contractor Tom Silva shows how to super-insulate an attic

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.