If you have on oddly shaped area such as an l shape split it into square or rectanglualar sections and treat them as two separate areas.
Calculate square feet attic.
Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.
Get fair costs for your specific project requirements.
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.
Create a rough sketch of your attic on a piece of paper.
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 divided by 150 equals 10 sq.
Step 3 multiply step 1 and step 2 together to get the area of the attic floor.
Next multiply the 4 square feet into cubic inches.
Stairways and closet areas are included in the square footage length.
Finished attic square footage is included if an area has at least seven minimum feet of clearance.
For example if your length is 40 feet and your width is 20 feet then 40 20 800 square feet.
This will give you a visual representation of the.
Calculate or enter the square footage of the attic or area to be vented.
If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.
Covered enclosed porches can only be included if they are heated using the same system as the rest of the house.
Measure the length and width of the attic floor space to be ventilated.
Of total vent space needed.
Measure the width of your attic space in feet.
The way to calculate a rectangular area is by measuring the length and width of your area then multiplying those two numbers together to get the area in feet squared ft 2.
A 50 x 30 attic would have a total area of 1 500 sq.
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See typical tasks and time to insulate an attic along with per unit costs and material requirements.
This free calculator estimates the square footage of a property and can account for various common lot shapes.
Measure the length and width of each square and rectangular area of the attic floor and note the dimensions on.
How to calculate the square feet of an attic step 1.
See professionally prepared estimates for attic insulation work.
In order to find the right calculator divide the attic floor space by 300 sq feet.
Length x width of attic in feet 150 total sq.