Spacing Of Attic Vents

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

Spacing of attic vents. 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. Soffit vents are commonly made of aluminum or. 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. Ft divided by 150 equals 10 sq.

Adding attic vents is a simple matter of cutting holes and installing vents. Soffit vents or under eave vents are installed on the underside of the roof that hangs over the siding the eaves. Space the vents at the bottom and top of the attic equally according to house size. A 50 x 30 attic would have a total area of 1 500 sq.

Soffit vents are one of the most popular intake vent styles. 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. Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them. There are also box or dome shaped vents that go through the roof itself.

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. 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. Length x width of attic in feet 150 total sq. 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.

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. Whole house fans powered attic fans. For the previous example you would need 20 soffit vents. Of total vent space needed.

There are also gable and roof fans which actively pull the hot air out of the attic. Photos 1 6 show how it s done. To install the rafter vents staple them directly to the roof decking. It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters.