Calculating Attic Size

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

Calculating attic size. Divide this number by two. Measure the width of your attic in feet. How to calculate the cubic feet of an attic. This calculator is to be used as an estimating tool only.

The formula above gives an approximate value of the cfm needed for an attic fan. The word denotes the framing or composition which helps that covering also. Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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.

8 inches and you have an 8 in 12 pitch. Attic fan size cfm 0 7 x sq ft area of the attic formula 1 the size of an attic fan is calculated in terms of cfm. If this distance measures 4 inches you have a 4 in 12 pitch. It s the covering on the uppermost part of the building or shelter which gives protection from pets or animals and weather notably rain or snow but heat also sunlight and wind.

Next we need to calculate the 5 and 8 ceiling lines. Click to see full size image. Measure the length and width of the attic floor space to be ventilated. Attic truss room size calculator a rooftop is part of a building envelope.

On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. How to size attic exhaust vent fans for your home attic size. Input length width and desired r value of the area to be insulated. Measure the height of your attic in feet.

Calculate or enter the square footage of the attic or area to be vented. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. So draw up a simple cross section showing the outside wall a rafter set at the correct pitch and a floor system. Pitch measurement method 2.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. I ll do this on the right side of the house which is a 12 12 pitch. Measure the length of your attic in feet.