Insulating Ac Ducts In Attic Foam

Many homeowners love spray foam insulation and it s easy to understand why.

Insulating ac ducts in attic foam.

When we seal the attic with spray foam it s as tight as a butter tub. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8 for attic ducts and 6 for ducts located anywhere else. Spray foam spreads fire very fast creates massive amounts of toxic smoke. Consider adding more insulation as ductwork is farther from the furnace.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Oh and when you put it in your attic spray foam insulates the attic itself. If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation. Compared to traditional insulation whether fiberglass or cellulose spray foam has the potential to provide better performance via its air sealing properties high r values per inch of thickness and in the case of closed cell spray foam ability to repel moisture.

Cover the metal ductwork with closed cell spray foam. In 60 seconds you ll be on your way to paying lots less when you use foam it green. One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic. The foam provides a vapor barrier so the ductwork won t sweat.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Cover the spray foam with fire retardant spray. In a vented attic all of that expensive airflow is lost to the environment.