Calculating Attic Size

Measure the length and width of the attic floor space to be ventilated.

Calculating attic size.

Pitch measurement method 2. 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. How to calculate the cubic feet of an attic. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.

Divide this number by two. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. So draw up a simple cross section showing the outside wall a rafter set at the correct pitch and a floor system. 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.

This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. We also need to allow for the floor system in our calculations. Measure the height of your attic in feet. The word denotes the framing or composition which helps that covering also.

Next we need to calculate the 5 and 8 ceiling lines. Measure the length of your attic in feet. Make sure to measure in the center at the attic s highest point. To determine the size of your attic multiply the width by the length of the attic floor in feet.

Input length width and desired r value of the area to be insulated. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Measure the width of your attic in feet. 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. I ll do this on the right side of the house which is a 12 12 pitch. Calculate or enter the square footage of the attic or area to be vented. Attic truss room size calculator a rooftop is part of a building envelope.

How to size attic exhaust vent fans for your home attic size. 8 inches and you have an 8 in 12 pitch. If this distance measures 4 inches you have a 4 in 12 pitch.