Spray Foam for Unvented Attics

One way to improve the energy efficiency of any building, including homes, is to insulate the attic with spray foam insulation.

Most homes have insulation on the attic floor, providing an insulated barrier between the attic and the living space. By moving this barrier to the roof deck underside, it brings the attic inside a building’s conditioned space. Any duct work is now inside as well as any air handlers which are located inside the attic. Spray foam can tie wall insulation into the attic insulation resulting in continuous insulation for the building envelope.

The application of spray foam helps to moderate temperature extremes in the attic resulting in more comfortable and maintainable temperatures inside the living spaces of the building. Because foam expands as it matures, it fills in all gaps and cracks which reduces the amount of air leakage through the roof deck itself.

Leaky duct work that might be located in the attic is no longer a problem when the roof deck underside is completely sealed with spray foam. The energy loss is minimized as the attic is now conditioned space. Further, the HVAC system does not need to work as hard to deliver the same consistent temperature and the HVAC system can be downsized as a result.

Spray foam provides additional strength to building materials. This is also true of roof rafters. By increasing the wind uplift resistance of roof systems, foam adds to the structural integrity of the home or business building.

Although all these benefits can be achieved from a combination of many products, only spray foam insulation can do all these jobs in an unvented attic with just one product.

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