Figuring Attic Ventilation

Figure 1 soffit to ridge attic ventilation.

Figuring attic ventilation.

Enter the length and width of the attic floor or the total square footage of the attic floor. Always consult a design professional for cathedral ceilings insulated roof decks etc. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. 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.

Hit the calculate button for the recommended amount of exhaust and intake ventilation. The house measures 30 feet by 50 feet. Ft divided by 150 equals 10 sq. Calculate the total vent area needed.

Roof attic ventilation calculator calculate how much ventilation you need for your roof. We have calculators for intake and exhaust roof venting. Of total vent space needed. The first step is to check out this 60 second video and learn about the 300 1 rule the difference between intake and exhaust ventilation and why proper ventilation is so important to get right to help calculate your attic ventilation needs visit gaf ventilation calculator.

Other options to meet your attic ventilation needs are. Let s use the following simple ranch house for an example. 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. Intake vents located at the lowest part of the roof under the eaves allow cool.

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. A 50 x 30 attic would have a total area of 1 500 sq. Enter square footage calculate or enter the square footage of the attic or area to be vented. Length x width of attic in feet 150 total sq.

According to the fha federal housing administration us for every 300 square feet of attic floor area you should have at minimum one square foot 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. How do you pick the right attic vent. If you are in the puget sound area of washington state and would like to have a free attic ventilation evaluation or roof estimate please contact us at 253 445 8950 or fill out our quick estimate form.

Calculating ventilation area of attic kitchen ventilation text. Skip to main content.