Calculating Attic Volume

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

Calculating attic volume.

Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed attic ventilation. Calculate or enter the square footage of the attic or area to be vented. For example if you have a cross gabled house with two wings split the attic into two parts where one wing joins the other. Once you have those measurements you apply some multiplication as follows.

Here s a rule of thumb to follow. This calculator is to be used as an estimating tool only. With a tape measure and some simple mathematical formulas you can easily calculate your attic s square footage. This calculator will help you estimate hip roof parameters including rafters and roof area person outline anton schedule 2011 08 29 17 53 20 one of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area.

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

Calculate the two halves of the attic separately then add the spaces together. 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. Up to 6 12 roof pitch use the standard formula as explained in this article. If the space includes irregular shapes such as triangles mark these off so.

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. Let s use the following simple ranch house for an example. Input length width and desired r value of the area to be insulated. 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.

Step 1 create a rough sketch of your attic on a piece of paper. How to calculate cubic feet. The house measures 30 feet by 50 feet. Cubic feet is a unit of volume.