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Spray Foam Insulation FAQ's

Joseph Coupal - Tuesday, January 15, 2013

Does spray foam insulation release any Volatile Organic Compounds (VOC)?

Polyurethane foam is not considered to emit VOC's. After curing there should be no emissions. To be sure, check with your foam supplier.

Can it be used to insulate underground water pipes?

Yes! Regional climate changes will be a part of the decision making process. During application, no moisture can be allowed on or in the foam until it has cured.

Should fiberglass insulation be removed before applying spray foam insulation?

Yes! If left in, there will be a problem with ventilation and temperature control. More clearly, the temperature of the attic floor will be different than amidst the fiberglass and the temperature amidst the fiberglass will be different than above the spray foam. The job of the spray foam is to balance temperature and humidity with the environment so condensation is prevented.

Does the surface where it will be applied have to be clean?

Yes! Any oil or dust on the application surface will prevent the spray foam insulation from adhering. A careful vacuuming job covering every nook and cranny will often be adequate.
For applications where the surface is steel (or any other metal) it is even more important for the surface to be free of dust and oil.

Does an attic need to be vented if spray foam insulation on the rafters?

That depends. If you are applying the spray foam to the roof deck and gable walls, then you want everything under that surface to be a part of the temperature conditioned space. Vents in an attic with insulation above it would be a waste of money. If you are applying spray foam to just the attic floor, then the conditioned space is below the attic floor. Vents will be necessary for preventing excess humidity.

There are likely many more questions concerning spray foam insulation. For more insulation contact Custom Insulation.

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