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DISCUSS: Vent or not to vent?


Due to extreme temperature variations ranging from 150° degrees in summer to sub-zero dip in winters, a vented attic system is a nightmare. Vapor condensation also occurs when hot moist air accumulates in the vented attic space and along with other cellulose materials, rain and snow causes growth of mold, damaging sheet-rock; not to forget the blazing fire that could enter the vents to destroy the structure.

Moisture loads in buildings can be drastically reduced by converting attics into semi-conditioned spaces in extreme climates by closing gable, soffits and ridge vents. This can be achieved by applying SPF to the roofline for conditioning* the attic space as well as improve performance of various systems in the attic. The performance of a duct system with insulation typically an R-4 to an R-6 range can be achieved by just moving it to conditioned space rather than an unconditioned area. This way supply system leakage is intact whereas, hot humid air, dust and allergens tend to be sucked into the ducts in a vented attic that could spread in the entire structure.

SPF’s complete thermal package insulates all outer walls and roofline and allows on an average of 7-10° variation in temperature from the conditioned living space to the attic in new construction homes and structures. As a comparison, an average attic temperature of 82-85° can be achieved with a complete thermal package in a living area of 75°. An average of 30-45° temperature reduction is possible in new/existing structures that only insulate the attic with SPF.

What about an Unvented Attic?