Roof Ventalation Requirements

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

Roof ventalation requirements.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. Ventsure 4 foot strip heat moisture ridge vent 27 lineal feet required. Attic ventilation requirements how many attic vents your roof needs industry standard for proper attic ventilation recommends for no vapor retarder type of attic insulation no paper plastic or aluminum layer between the attic floor and insulation layer 1 sq. Foot of ventilation for every 150 sq.

You can also contact your local municipality to check on building code in your area. 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. The key to proper ventilation of your roof and attic is balance. Feet of attic space divided 50 50 between the inlets and outlets.

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.