Eco-logical Building Performance,Inc.

Does Venting an Attic Remove Moisture?

Converting attics into a semi-conditioned space in hot climates by closing soffits, gable and ridge vents is a positive design approach in reducing the moisture loads in houses and buildings. This can be achieved by moving the insulation from the floor of the attic to the underside of the roof deck. The usage of a high quality and low air permeable spray foam insulation, sprayed to the underside of the roof decks and sealing all vents, is an excellent approach in air leakage control. This design prevents the moisture laden air from the outside to enter into the attic and subsequently into the houses and building. In the state of Florida this design approach has been conducted for more than a decade and thousands of residential and commercial constructions have used the conditioned attic without any energy penalty when compared to the vented attics with air distribution ducts.

Test Your Attic IQ

Q: Air movement through a vented attic reduces cooling load.

A: FALSE: In vented attics radiant heat from the roof deck increases the attic temperature substantially.

Q: Venting attics removes moisture.

A: FALSE: In hot humid climates the best way to prevent moisture condensation is to prevent moisture altogether by sealing the attic from outside temperatures.

Q: Closed attics are more cost-effective and energy-efficient than vented attics.

A: TRUE: Closed attics are really the smarter choice!


attic venting and temperature

Why Choose Spray Foam Insulation?
•Because it will save you money! You will be astonished by the reduction in your heating and cooling bills, allowing you to spend your money how you please.
•It helps to seal all cracks, gaps and voids in your walls and roof unlike traditional insulation, and will create an air barrier, keeping exterior moisture and unconditioned air out.
•It will help create a more comfortable indoor environment by reducing outside pollutants, allergens and noise.
•Spray foam insulation is a proven technology that has been in use for over 25 years in commercial, industrial and residential buildings.
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