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.

How much attic vent for 1100 square feet.

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. 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. Net free area in square inches. 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.

2200 square foot home x 8 inch ceiling height 17600 cubic feet. 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. 20 x 50 1 000 sq. Attic x 0 7 700 cfm minimum fan rating.

Get fair costs for your specific project requirements. See typical tasks and time to insulate an attic along with per unit costs and material requirements. So if your attic is 1 500 sq. Attic area in square feet.

And this guideline you ll need a minimum of. See professionally prepared estimates for attic insulation work. Example 20 wide by 50 long attic. Of vent space for every 150 sq.

Near ridge of the roof. Ventilation 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. We know we need 5 square feet total of ventilation area.

The cost to insulate an attic starts at 1 68 3 25 per square foot but can vary significantly with site conditions and options. Ft you divide that by 150 to get 10 sq. The rule of thumb on the amount of vent space needed is approximately 1 sq. Based on your 1100 sq.