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.
Figuring attic ventilation.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
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.
Hit the calculate button for the recommended amount of exhaust and intake ventilation.
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Enter the length and width of the attic floor or the total square footage of the attic floor.
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.
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.
Of total vent space needed.
Figure 1 soffit to ridge attic ventilation.
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.
Let s use the following simple ranch house for an example.
Roof attic ventilation calculator calculate how much ventilation you need for your roof.
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.
Intake vents located at the lowest part of the roof under the eaves allow cool.
As an example in an attic that is 30 feet by 20 feet you would have 600 square feet of floor area.
A 50 x 30 attic would have a total area of 1 500 sq.
Length x width of attic in feet 150 total sq.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
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.
Always consult a design professional for cathedral ceilings insulated roof decks etc.
Ft divided by 150 equals 10 sq.
We have calculators for intake and exhaust roof venting.
Calculate the total vent area needed.
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.
