Roof Vent Area

Roof vents choose one of the following products to meet the recommended exhaust nfva of 528 square inches.

Roof vent area. Drip edge vents are a two in one installation that promote water shedding at the eaves and rakes of a roof while also allowing for ventilation into the attic. A drip edge vent is made of a corrosive resistant material that sticks out about three inches back from the roof edge and then bends downward over them. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. So the ridge ventilation has exceeded the minimum requirement.

The building codes and building science for natural roof ventilation however only appeared in the 1940s. Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. Nine hundred square inches equals 6 25 square feet. When installed as part of a properly balanced when installed as part of a properly balanced attic ventilation system gaf cobra exhaust vent is a shingle over exhaust vent installed at the roof ridge that helps exhaust excess heat and moisture from your attic.

Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. Ventsure 4 foot strip heat moisture ridge vent 27 lineal feet required. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams.

Width or area. Standard ridge vent produces 18 square inches of ventilating area per lineal foot. Our roof is 50 feet long so using a standard product we will get 900 square inches of ventilating space. Continuous un blocked soffit or eaves intake venting combined with continuous roof ridge venting or equivalent area if the building framing does not permit a ridge vent are needed to avoid ice dams attic condensation attic mold rot or insect damage from accumulating attic moisture.

Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals. It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters connectors or end plugs needed.