Calculating Attic Volume

This calculator is to be used as an estimating tool only.

Calculating attic volume. For example if you have a cross gabled house with two wings split the attic into two parts where one wing joins the other. Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed attic ventilation. 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. Calculate the two halves of the attic separately then add the spaces together.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Once you have those measurements you apply some multiplication as follows. Input length width and desired r value of the area to be insulated. Let s use the following simple ranch house for an example.

Step 1 create a rough sketch of your attic on a piece of paper. 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. 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. 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.

Calculating ventilation area of attic kitchen ventilation text. How to calculate cubic feet. 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 will give you a visual representation of the dimensions of your attic for reference.

Here s a rule of thumb to follow. 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. 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.

This vent fan removes heated air from inside that space and should be placed near the peak to effectively remove the hottest air. Calculate or enter the square footage of the attic or area to be vented. If the space includes irregular shapes such as triangles mark these off so. For more complex attic spaces draw a sketch of your space and divide the space into parts before performing the calculations.