Calculating Attic Ventalation

Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs.

Calculating attic ventalation.

Vent calculatordesign your balanced ventilation system. Calculate the square footage of the attic space. If local code requires the 1 150 rule please double the requirements. For balanced ventilation an equal amount of intake vent area net free area should also be installed.

Determine the amount of ventilation needed for your home with this formula. Calculate the area of your attic and the proper number of vents. Calculating attic ventilation requirements. Calculate the total vent area needed.

Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. There should also be a 50 50 balance of attic venting and roof venting. 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. Calculate the square footage of your attic and provide proper attic ventilation with the right number of roof vents ridge vents or soffit vents.

Length x width of attic in feet 150 total sq. Result of item 1 300. Enter the length and width of the attic floor or the total square footage of the attic floor. 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.

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. Our soffit vents round back vents pop vents and universal vents make excellent intake vents. Hit the calculate button for the recommended amount of exhaust and intake ventilation. 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. All lomanco attic ventilation product requirements are based on the minimum standard 1 300 rule as set forth by the international building code ibc and the international residential code irc. Enter square footage calculate or enter the square footage of the attic or area to be vented. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.

Width or area.