Calculating Attic Volume

Remember the minimum area requirement when using a continuous system is a ratio of 1 300.

Calculating attic volume.

Attic square footage 2 square inches of exhaust and square inches of intake net free area nfa needed. Next multiply the 4 square feet into cubic inches. Measure the length of your attic in feet. Measure the length and width of the attic floor space to be ventilated.

In order to find the right calculator divide the attic floor space by 300 sq feet. So in our example we will divide the 1 500 square feet by 300. How to calculate the cubic feet of an attic. Measure the width of your attic in feet.

Now let s figure out how much ventilation space we need. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Divide this number by two. Input length width and desired r value of the area to be insulated.

Whether you plan on improving the ventilation in your attic or adding energy saving insulation you will need to accurately determine its actual size. 1 500 square feet 300 5 square feet. Then enter the height at the highest point. Square footage relates to the floor area only and does not factor in the height of the attic space.

Enter the length and width of your attic or ceiling crawl space. Nfa is the unobstructed area through which air can pass through a vent usually measured in square inches. Ventilation manufacturers assign an nfa value to the non motorized vents they make. Ok so now we know the square footage of the attic area to be ventilated.

1 cubic foot is 12 x 12 144 cubic inches. See how simple that was. For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator. 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.

This calculator is to be used as an estimating tool only. Calculate or enter the square footage of the attic or area to be vented. Select if your roof is more flat of peaked. Then click on calculate.

Make sure to measure in the center at the attic s highest point. This calculator will help you estimate hip roof parameters including rafters and roof area person outline anton schedule 2011 08 29 17 53 20 one of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area.