How Many Square Feet Is An Average Attic

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.

How many square feet is an average attic.

2200 square foot home x 8 inch ceiling height 17600 cubic feet. Because vents are rated in square inches you need to convert the square feet required to square inches. A 50 x 30 attic would have a total area of 1 500 sq. Determine the home s cubic measurement by multiplying the square footage by ceiling height.

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. Calculate the total vent area needed. Of total vent space needed. One way is by working within the home s existing footprint and converting the attic into living space.

Attic x 0 7 700 cfm minimum fan rating. Step 5 add together the square footage values of the square rectangular and triangular floor areas to find the total square footage of your attic. For example if your length is 40 feet and your width is 20 feet then 40 20 800 square feet. To get the area of the attic floor.

Divide the attic s square footage by 150. 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. Ft divided by 150 equals 10 sq. Add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof.

Measure the height of your attic in feet. This is accomplished by taking the square feet recommended and multiplying by 144. Attic vent fans are commonly. For example if the height of your attic is 8 feet then 8 2 4.

Length x width of attic in feet 150 total sq. 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. The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space. 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. The roof pitch or roof slope is usually shown as a ratio to 12 i e 1 12 4 12 12 12 etc.