Spacing Of Attic Vents

But before you cut any holes plan the locations of the attic vents.

Spacing of attic vents.

Soffit vents or under eave vents are installed on the underside of the roof that hangs over the siding the eaves. For the previous example you would need 20 soffit vents. Soffit vents are commonly made of aluminum or. Length x width of attic in feet 150 total sq.

Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings. There are also box or dome shaped vents that go through the roof itself. There are also gable and roof fans which actively pull the hot air out of the attic. It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters.

Calculate the total vent area needed. Multiply the length of the attic times the width in feet to find the attic area then divide by 150 to find the total square feet of vent space needed. Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them. Fans and vents may be installed on the roof system that will draw the air out of the attic space and exhaust it to the exterior.

Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. To install the rafter vents staple them directly to the roof decking. Ft divided by 150 equals 10 sq. Adding attic vents is a simple matter of cutting holes and installing vents.

Whole house fans powered attic fans. They are easy to install under the roof s overhang which is known as the soffit are generally hidden from sight and provide excellent protection from weather outdoor debris and pests while still allowing air to flow into the attic. An attic s intake vents are most commonly installed directly in the soffit either as individual vents spaced every few feet or as one continuous perforated soffit running the entire length of. These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and automatically exhausts the attic space.

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. You need to have an equal number of vents located at the bottom of the attic or under the roof easement as you have at the top of the attic near a gable or ridge. Space the vents at the bottom and top of the attic equally according to house size. Photos 1 6 show how it s done.