How Important Is Basement Insulation?
Most homeowners don’t think of their basement insulation as a prime source of heat loss, yet basements can account for 20 to 35 percent of a home’s total heat loss. Basements lose so much heat because of large, uninsulated surfaces above and below grade level. Contrary to popular opinion, earth is a poor source of basement insulation. There is also a lot of air leakage through basement windows and penetrations, through cracks, and at the top of the foundation wall (sill area).
