Roof Ventilation Requirements

Foot of ventilation for every 150 sq.

Roof ventilation 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. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. 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.

Measure the length and width of the attic floor space to be ventilated. Roof vents choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Ventsure 4 foot strip heat moisture ridge vent 27 lineal feet required. Most building codes require a ratio of 1 150 ventilation space to attic floor space.

The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.