Blown in Fiberglass
In areas where blown-in fiberglass insulation was used, it has shifted and settled over time. This left lots of uninsulated spots throughout the attic.
Batt Fiberglass Insulation
The majority of the attic was insulated with fiberglass batts. We can see that the batts don't rise above the joists and are very dirty. For fiberglass insulation to be effective, it needs to be enclosed on all 6 sides, otherwise it's just acting as an air filter. Conditioned air carrying dirt and dust escape from the living space into the attic and the fiberglass catches all of those little particles.
Air Sealing
To seal and re-insulate this attic we started by removing all of the old insulation then started air sealing. All top plates, utility penetrations, recessed lights, and any other gaps to the living space are sealed with foam.
Cellulose Insulation
Cellulose is blown into the attic space, creating a fresh new blanket of insulation. Because cellulose is so much smaller than blown fiberglass, it has fewer air gaps, allowing less air to pass through it and making it a better insulator.
