Calculating Attic Ventalation

Calculate the square footage of the attic space.

Calculating attic ventalation.

Width or area. Calculate the square footage of your attic and provide proper attic ventilation with the right number of roof vents ridge vents or soffit vents. Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. 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.

Vent calculatordesign your balanced ventilation system. Length x width of attic in feet 150 total sq. Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. See quantities below for each gaf ventilation product typically rounded up.

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. Calculate the total vent area needed. Hit the calculate button for the recommended amount of exhaust and intake ventilation. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.

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. According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. Calculating attic ventilation requirements. Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.

Enter square footage calculate or enter the square footage of the attic or area to be vented. Enter the length and width of the attic floor or the total square footage of the attic floor. Determine the amount of ventilation needed for your home with this formula. Divide the square footage item 1 by 300.

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. Calculate the area of your attic and the proper number of vents. If local code requires the 1 150 rule please double the requirements. 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.

Result of item 1 300.