Calculating Attic Volume

For more complex attic spaces draw a sketch of your space and divide the space into parts before performing the calculations.

Calculating attic volume.

Ok to determine how much ventilation area you need for your house all you need to know is the square foot area of the attic to be ventilated. To calculate the volume or capacity of an item or space in cubic feet you will first need to measure its length width and height in either feet inches or a combo of both centimeters meters or yards. This calculator is to be used as an estimating tool only. Let s use the following simple ranch house for an example.

Cubic feet is a unit of volume. Calculate the two halves of the attic separately then add the spaces together. Calculating ventilation area of attic kitchen ventilation text. Calculate or enter the square footage of the attic or area to be vented.

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. Input length width and desired r value of the area to be insulated. This vent fan removes heated air from inside that space and should be placed near the peak to effectively remove the hottest air. Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed attic ventilation.

Step 1 create a rough sketch of your attic on a piece of paper. This calculator is designed to arrive at a reasonable attic or ceiling crawl space ventilation fan air volume displacement rating for minimum normal and optimum outside heat conditions. Once you have those measurements you apply some multiplication as follows. The house measures 30 feet by 50 feet.

Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. How to calculate cubic feet. If the space includes irregular shapes such as triangles mark these off so. Here s a rule of thumb to follow.

For example if you have a cross gabled house with two wings split the attic into two parts where one wing joins the other. Click the button to calculate the depth in inches and pounds of total insulation required for this job. With a tape measure and some simple mathematical formulas you can easily calculate your attic s square footage. Up to 6 12 roof pitch use the standard formula as explained in this article.