Calculating Attic Ventalation

If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.

Calculating attic ventalation.

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. Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards. To find out how many soffit vents you need to install. Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs.

Jones takes this measurement and divides it by 150 for a total of 7 36 square feet of ventilation space that is needed. The house measures 30 feet by 50 feet. Calculate the total vent area needed multiply the length of the attic times the width in feet to find the attic area. Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge.

As an example in an attic that is 30 feet by 20 feet you would have 600 square feet of floor area. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph. Let s use the following simple ranch house for an example. Calculate the soffit vent area needed divide the total vent area by two to determine the soffit vent area.

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. 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. Width or area.

Enter the length and width of the attic floor or the total square footage of the attic floor. Hence you would need two square feet 600 300 of attic ventilation. This yields a total area of 1 104 square feet. Jones has an attic space that measures 23 feet by 48 feet.

There should also be a 50 50 balance of attic venting and roof venting.