06/23/2026
Older NEPA home with drafty rooms and no wall insulation? You don't have to tear out drywall to fix it.
A method called drill and fill lets installers add insulation through small holes in the wall.
Injection foam and blown-in cellulose or fiberglass flow into the empty cavities, sealing drafts and quieting rooms without major demolition.
Injection foam offers the best air sealing and thermal performance of the options.
Tap Learn More for the full guide to insulating existing walls.
Want to insulate behind existing walls but don’t know how? This guide will explain the process, different insulation types, and benefits.