How Much Attic Vent For 1100 Square Feet

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How much attic vent for 1100 square feet. 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. This shortcut conveniently calculates the 2015 international residential building code minimum irc section r806 roof ventilation 1 which states in part 1 square foot of net free area for every 150 square feet of attic floor space with the attic defined as length x width floor of the attic. So if your attic is 1 500 sq. Example 20 wide by 50 long attic.

See typical tasks and time to insulate an attic along with per unit costs and material requirements. Ft you divide that by 150 to get 10 sq. Net free area in square inches. Get fair costs for your specific project requirements.

As an example let s use a home that measures 2200 square feet has an average floor to ceiling height measurement of 8 feet and a whole house fan with cfm rating of 1600. The cost to insulate an attic starts at 1 68 3 25 per square foot but can vary significantly with site conditions and options. Near ridge of the roof. Attic x 0 7 700 cfm minimum fan rating.

Attic area in square feet. Based upon just about everyone s recommendations 60 percent or 3 square feet of this should be in the soffit area and the remaining 40 percent 2 square feet should be located at the ridge of the roof. 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. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per minute that the fan should be rated to move.

Based on your 1100 sq. We know we need 5 square feet total of ventilation area. 2200 square foot home x 8 inch ceiling height 17600 cubic feet. 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.

The rule of thumb on the amount of vent space needed is approximately 1 sq. 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. Of vent space for every 150 sq. Ventilation area in square feet.