Calculating Attic Ventalation

To find out how many soffit vents you need to install.

Calculating attic ventalation.

According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. See quantities below for each gaf ventilation product typically rounded up. Width or area. 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.

Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards. Let s use the following simple ranch house for an example. Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. Jones has an attic space that measures 23 feet by 48 feet.

Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. 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. Calculate or enter the square footage of the attic or area to be vented. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.

As an example in an attic that is 30 feet by 20 feet you would have 600 square feet of floor area. This yields a total area of 1 104 square feet. Calculate the soffit vent area needed divide the total vent area by two to determine the soffit vent area. Enter the length and width of the attic floor or the total square footage of the attic floor.

Hit the calculate button for the recommended amount of exhaust and intake ventilation. Jones takes this measurement and divides it by 150 for a total of 7 36 square feet of ventilation space that is needed. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. Calculating ventilation area 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.

Hence you would need two square feet 600 300 of attic ventilation.