The use of SPF in residential attics is one application that's on the rise. Homes have been built with ventilated attics — usually screened vent holes under the eaves — this allows warm air and moisture to escape and to keep the roof cold in the winter, thus stopping the formation of ice dams.

However, the construction and acceptance of non-vented, conditioned attics has been increasing since 2006, when the International Residential Code started permitting them, partly in response to builders wanting to locate HVAC equipment in the attic.

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SPF is a great option when it comes to products used to turn attics into conditioned spaces so HVAC systems can operate efficiently and effectively when installed to code homeowners also benefit by picking up storage space that is the same temperature as the rest of the house.

SPF comes in open- or closed-cell foams and either can be used for non-vented attics. Closed-cell SPF, which is more rigid and stronger, often is recommended for the pitched part of the roof and helps increase structural strength.