Calculating Attic Size

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

Calculating attic size.

So draw up a simple cross section showing the outside wall a rafter set at the correct pitch and a floor system. 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. Attic truss room size calculator a rooftop is part of a building envelope. 8 inches and you have an 8 in 12 pitch.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Make sure to measure in the center at the attic s highest point. 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. I ll do this on the right side of the house which is a 12 12 pitch.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. The word denotes the framing or composition which helps that covering also. Measure the height of your attic in feet. The formula above gives an approximate value of the cfm needed for an attic fan.

This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. Input length width and desired r value of the area to be insulated. Divide this number by two. Click to see full size image.

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. If this distance measures 4 inches you have a 4 in 12 pitch. Calculate or enter the square footage of the attic or area to be vented. Measure the width of your attic in feet.

How to calculate the cubic feet of an attic. Next we need to calculate the 5 and 8 ceiling lines. How to size attic exhaust vent fans for your home attic size. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per.

Pitch measurement method 2. To determine the size of your attic multiply the width by the length of the attic floor in feet. We also need to allow for the floor system in our calculations.