Calculating Attic Ventilation Needs

Gaf attic ventilation calculator.

Calculating attic ventilation needs.

Calculating attic ventilation requirements. Of total vent space needed. 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.

How attic ventilation works. Ft divided by 150 equals 10 sq. His home is 48 feet long and has a ridge vent that measures 46 feet. Calculating ventilation area of attic kitchen ventilation text.

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. The house measures 30 feet by 50 feet. Let s use the following simple ranch house for an example. 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.

For balanced ventilation an equal amount of intake vent area net free area should also be installed. The ridge vent is cut back 1 inch on either side of the ridgeline which yields a total area of 7 67 square feet of ventilation. Divide the square footage item 1 by 300. Standard attic vents like af 50 s ventilation fans or solar powered attic fans.

Use avp s roof vent calculator to determine the number and size of exhaust vents you will need. Ridge vents are one of the easiest ways to meet roof venting requirements. Calculate the total vent area needed. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

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. A 50 x 30 attic would have a total area of 1 500 sq. 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.

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. Enter square footage 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. His next step is to calculate the total amount of ventilation that he has in his attic.

Calculate the square footage of the attic space. Length x width of attic in feet 150 total sq. Intake vents located at the lowest part of the roof.