Calculating Attic Size

The house measures 30 feet by 50 feet.

Calculating attic size.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. For example if you have a cross gabled house with two wings split the attic into two parts where one wing joins the other. Calculating ventilation area of attic kitchen ventilation text. The truss is a framework consisting of rafters posts and struts which supports your roof.

Input length width and desired r value of the area to be insulated. 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. The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. The word denotes the framing or composition which helps that covering also.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. To determine the size of your attic multiply the width by the length of the attic floor in feet. For more complex attic spaces draw a sketch of your space and divide the space into parts before performing the calculations.

The formula above gives an approximate value of the cfm needed for an attic fan. Attic truss room size calculator a rooftop is part of a building envelope. 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. 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 attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. Calculate or enter the square footage of the attic or area to be vented. 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.

Attic fan size calculation. Calculate the two halves of the attic separately then add the spaces together. Let s use the following simple ranch house for an example.