Calculating Attic Ventilation Needs

Calculating attic ventilation requirements.

Calculating attic ventilation needs. Length x width of attic in feet 150 total sq. Multiply the length of the attic times the width in feet to find the attic area then divide by 150 to find the total square feet of vent space needed. 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. The house measures 30 feet by 50 feet.

Let s use the following simple ranch house for an example. Calculate the square footage of the attic space. His next step is to calculate the total amount of ventilation that he has in his attic. Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.

A 50 x 30 attic would have a total area of 1 500 sq. 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. Ft divided by 150 equals 10 sq. Hence you would need two square feet 600 300 of attic ventilation.

Use this calculator to help determine the proper amount of attic ventilation based on u s. Of total vent space needed. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Enter square footage calculate or enter the square footage of the attic or area to be vented.

The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes. Other options to meet your attic ventilation needs are. Calculate the total vent area needed. Result of item 1 300.

Divide the square footage item 1 by 300. The two square feet is divided equally between the intake and the exhaust one square foot for each. How attic ventilation works. His home is 48 feet long and has a ridge vent that measures 46 feet.

For balanced ventilation an equal amount of intake vent area net free area should also be installed. Gaf attic ventilation calculator. Calculating ventilation area of attic kitchen ventilation text. Ridge vents are one of the easiest ways to meet roof venting requirements.

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. Intake vents located at the lowest part of the roof. 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.