Roof Ventalation Requirements

R806 1 ventilation required enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow.

Roof ventalation requirements.

Roof vents choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Feet of attic space divided 50 50 between the inlets and outlets. You can also contact your local municipality to check on building code in your area. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

Ventsure 4 foot strip heat moisture ridge vent 27 lineal feet required. 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. The key to proper ventilation of your roof and attic is balance. Foot of ventilation for every 150 sq.

You can calculate attic ventilation requirements by determining the square footage of your attic floor its width times its length and compare that to the total required net free area nfa.