Calculating Attic Size

Click the button to calculate the depth in inches and pounds of total insulation required for this job.

Calculating attic size.

This calculator is to be used as an estimating tool only. Pitch measurement method 2. To determine the size of your attic multiply the width by the length of the attic floor in feet. Next we need to calculate the 5 and 8 ceiling lines.

The word denotes the framing or composition which helps that covering also. If this distance measures 4 inches you have a 4 in 12 pitch. We also need to allow for the floor system in our calculations. Calculate or enter the square footage of the attic or area to be vented.

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. The formula above gives an approximate value of the cfm needed for an attic fan. Measure the width of your attic in feet. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

How to size attic exhaust vent fans for your home attic size. 8 inches and you have an 8 in 12 pitch. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. Divide this number by two.

Measure the height of your attic in feet. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. How to calculate the cubic feet of an attic. Make sure to measure in the center at the attic s highest point.

Input length width and desired r value of the area to be insulated. So draw up a simple cross section showing the outside wall a rafter set at the correct pitch and a floor system. 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. Click to see full size image.

Attic truss room size calculator a rooftop is part of a building envelope. Measure the length and width of the attic floor space to be ventilated. 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.