Shingle Roof Ventilation Requirements

Near ridge of the roof.

Shingle roof ventilation requirements.

The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. In order for attic ventilation to work effectively however the ventilation system must have balanced intake and exhaust. You can calculate attic ventilation requirements by determining the square footage of your attic. A balanced system is where intake ventilation at the eave areas is equaled at or near the ridge area.

The key to proper ventilation of your roof and attic is balance. Good attic ventilation extends the service life of asphalt shingles and reduces many roof issues by minimizing the difference in temperatures between the attic and outside air. The preferred ration is 1 sq. And this guideline you ll need a minimum of.

Unobstructed or net free area of ventilation for every 300 sq. Proper ventilation is one of the most important considerations homeowners and builders must consider when installing asphalt shingle roofing. Minimum ventilation requirements are 1 sq. Measure the length and width of the attic floor space to be ventilated.