How to Add Intake Ventilation When There Are No Soffits
Apr 19, 2016
How to Add Intake Ventilation When There are No Soffits
No soffits? No problem! Just use the new GAF Cobra® IntakePro™ Rooftop Intake Vent. Learn all about it with this detailed installation video.
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:
- Promote your home’s energy efficiency by allowing cool, fresh air to enter your attic, driving moist, warm air out
- Add critical intake ventilation to homes with little or no soffits
- Boost the airflow of your attic ventilation system when used with existing soffit undereave vents
- Guard against ice damming in harsh winter climates
- Prevent premature roof system deterioration and limit the growth of harmful mold and mildew
Homeowner's Best ChoicePromotes Energy Efficiency... Allows cool, fresh air to enter your attic, driving moist, warm air out of your attic’s exhaust vents
- Excellent Protection... Helps guard against roof system rot, ice damming, and mold and mildew growth
- Boosts Existing Attic Ventilation... Can improve attic ventilation airflow by up to 20% when installed with existing soffit/undereave vents in a properly balanced ventilation system*
- Looks Good... Tapered shingle-over design blends in seamlessly with the look of your roof
- Peace of Mind... Up to a Lifetime ltd. warranty when installed on Lifetime Shingle roofs**
Professional's Best Choice
- A Great Solution... For tough-to-vent properties with little or no soffits, clogged/closed undereave vents, and vented roof decks
- Keeps You on the Roof... Eliminates the need for time-consuming alterations at the soffit
- Easy to Install... Rolls out and fastens with included 1¾" (44.4 mm) coil nails
- Excellent Airflow... 9 sq. inches per lineal foot (19,051 mm2/lm) of net free area
- Versatile... For use on roof pitches 4:12 and greater and can be installed at the eave edge or up-slope areas of the roof
- Durable... Crush-resistant design resists wind-driven rain, snow, and ice-dam infiltration***
** 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 Requirements
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.