How Many Square Feet Is An Average Attic

Now that you have the footprint or square footage of the attic space multiply the total roof square footage by the applicable pitch factor to complete your estimate for the amount of foil you will need to cover the roof slopes.

How many square feet is an average attic.

The roof pitch or roof slope is usually shown as a ratio to 12 i e 1 12 4 12 12 12 etc. Because vents are rated in square inches you need to convert the square feet required to square inches. This is accomplished by taking the square feet recommended and multiplying by 144. Divide this number by two.

Add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof. A 50 x 30 attic would have a total area of 1 500 sq. Attic x 0 7 700 cfm minimum fan rating. Length x width of attic in feet 150 total sq.

For example if the height of your attic is 8 feet then 8 2 4. For example if your length is 40 feet and your width is 20 feet then 40 20 800 square feet. Thus 6 66 divided by 2 3 33 square feet of attic ventilation for intake and 3 33 square feet of attic ventilation for exhaust. To get the area of the attic floor.

Divide the attic s square footage by 150. 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. 2200 square foot home x 8 inch ceiling height 17600 cubic feet. With full home additions costing 75 000 minimum and usually far higher many homeowners search for creative ways to increase living space without overly decreasing their bank account.

The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space. Determine the home s cubic measurement by multiplying the square footage by ceiling height. One way is by working within the home s existing footprint and converting the attic into living space. Ft divided by 150 equals 10 sq.

For example if the base is 12 feet and the height is 10 feet the square footage is 6 x 10 60 feet. Of total vent space needed. 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.

Make sure to measure in the center at the attic s highest point. 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.