How Much Attic Vent For 1100 Square Feet

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.

How much attic vent for 1100 square feet. Based on your 1100 sq. Get fair costs for your specific project requirements. 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 if your attic is 1 500 sq.

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. Of vent space for every 150 sq. Net free area in square inches. Determine the home s cubic measurement by multiplying the square footage by ceiling height.

See typical tasks and time to insulate an attic along with per unit costs and material requirements. Attic area in 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. We know we need 5 square feet total of ventilation area.

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. Near ridge of the roof. The cost to insulate an attic starts at 1 68 3 25 per square foot but can vary significantly with site conditions and options. See professionally prepared estimates for attic insulation work.

Attic x 0 7 700 cfm minimum fan rating. 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. Ft you divide that by 150 to get 10 sq. 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.

Example 20 wide by 50 long attic. Ventilation area in square feet. 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.