Calculating Attic Volume

Input length width and desired r value of the area to be insulated.

Calculating attic volume.

Calculating ventilation area of attic kitchen ventilation text. Step 1 create a rough sketch of your attic on a piece of paper. 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. For example if you have a cross gabled house with two wings split the attic into two parts where one wing joins the other.

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. 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. The house measures 30 feet by 50 feet.

Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed attic ventilation. Let s use the following simple ranch house for an example. How to calculate cubic feet. Here s a rule of thumb to follow.

For more complex attic spaces draw a sketch of your space and divide the space into parts before performing the calculations. Calculate the two halves of the attic separately then add the spaces together. Once you have those measurements you apply some multiplication as follows. Click the button to calculate the depth in inches and pounds of total insulation required for this job.

This will give you a visual representation of the dimensions of your attic for reference. If the space includes irregular shapes such as triangles mark these off so. This vent fan removes heated air from inside that space and should be placed near the peak to effectively remove the hottest air. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

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. 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. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.