| There is a difference between insulating a building and sealing it, so the contractor is correct in that regard. However, I sense he is also making some misleading and overblown claims about his product. With standard blown-in fiberglass attic insulation, bits of fiberglass are blown into place with air. The loft of the fiberglass/air combination creates millions of tiny air pockets, which in turn slows down the movement of heated air from the house and helps keep that heat from being lost and therefore wasted. |
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R-value, which indicates how well a material resists the passage of heat through it, is a consistent, calculated value. So when the building codes require R-38, that means R-38, whether it’s from fiberglass, foam boards, sprayed foam, or any other material or combination of materials. And while the foam does offer some definite sealant properties that will contribute to a warmer home, that certainly does not account for an additional R-14 in insulating value. I would suggest that you contact whichever local utility company supplies the fuel you use as your primary heating source – electricity, gas, etc. They can provide you with a wealth of information about weatherization and insulation, and can assist you further with what will work best for your home and who the reputable local insulation contractors are.
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