Many homes in North America have inadequate attic ventilation systems, which can often be attributed to the lack of proper attic intake ventilation. Failing to properly install intake ventilation can render your attic ventilation system virtually useless. Intake ventilation lets cool, fresh air into the system, while exhaust ventilation (typically a ridge vent) allows moist, warm air to exhaust from the attic. Unfortunately, proper intake ventilation is often overlooked by siding, gutter, or painting contractors who typically work in the soffit/undereave areas of your home. In addition, Cape Cod-style homes without soffits, soffits with clogged or painted-over vents, and vented roof deck systems are challenging to ventilate without expensive modifications.
A properly balanced attic ventilation system consisting of both Cobra® IntakePro™ Rooftop Intake Vent and exhaust vents will help:
* Based on GAF ASHRAE airflow testing at 5 mph wind speed
** See GAF Shingle & Accessory Ltd. Warranty for complete coverage and restrictions. The word “Lifetime” refers to the length of coverage provided by the GAF Shingle & Accessory Ltd. Warranty and means as long as the original individual owner(s) of a single-family detached residence [or the second owner(s) in certain circumstances] owns the property where the shingles and accessories are installed. For owners/structures not meeting the above criteria, Lifetime coverage is not applicable. Lifetime Ltd. Warranty on accessories requires the use of at least three qualifying GAF accessories and the use of Lifetime Shingles.
*** Under GAF controlled laboratory testing
Balanced ventilation requires an equal amount of intake ventilation and exhaust ventilation. GAF recommends, at a minimum, providing 1 square foot of Net Free Ventilation for every 300 square feet of attic floor space. Consult local building codes for specific ventilation requirements in your area.
1. Calculate the total square footage of the attic floor area (round up to the next highest number). This number will determine the minimum total lineal feet of Cobra® IntakePro™ Rooftop Intake Vent that is needed.
2. Find the appropriate amount of Cobra® IntakePro™ Rooftop Intake Vent and minimum exhaust ventilation that corresponds to the total attic square footage.
All documents are U.S. English unless otherwise noted