How density changes performance
At 2.2–4.0 lb per cubic foot, fiberglass loses most of its convective airflow. The R-value per inch goes up and the cavity behaves much closer to a sealed assembly.
Resource Guide
Dense Pack Fiberglass Guide
Dense pack is one of the most underrated retrofit options — high performance with minimal disruption.
Back to Dense Pack Fiberglass
Where it works best
Closed wall cavities, floor systems above unconditioned space, and rim joist areas. Not a substitute for proper attic-floor insulation.
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