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How Much It’s Going to Cost to Insulate an Existing Home with Foam

EXPECTATION: Foam insulation should cost the same as traditional insulation like fiberglass or cellulose.


REALITY: There are several reasons why foam insulation is more expensive than traditional insulation.


When compared, foam insulation is a premium product that creates an air seal that traditional insulation can't. Because of this, most contractors buy straight from the manufacturer. This means the foam a contractor installs in your home can’t be purchased in a home improvement store like fiberglass or cellulose.


Another reason foam insulation is more expensive goes back to this first point. It takes heavy-duty, likely custom-made machinery to install both injection and spray foam insulation. On the other hand, fiberglass batts don’t require any heavy machinery and if you’re installing cellulose you can rent the machine from the store.



Finally, you have to think about the longevity of the insulation. Foam insulation will last as long as the life of the house, while fiberglass and cellulose may need to be replaced as soon as 15 years. You’ll never have to pay to upkeep foam insulation, but you will need to pay to upkeep and replace fiberglass and cellulose.

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