Attic Ventilation Requirements Calculator

Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.

Attic ventilation requirements calculator.

In order to find the right calculator divide the attic floor. Intake vents located at the lowest part of the roof under the eaves. 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.

The two square feet is divided equally between the intake and the exhaust one square foot for each. Enter square footage calculate or enter the square footage of the attic or area to be vented. 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. 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.

Calculate the total vent area needed. 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. Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards. Divide the square footage item 1 by 300.

Use this calculator to help determine the proper amount of attic ventilation based on u s. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. A 50 x 30 attic would have a total area of 1 500 sq. There should also be a 50 50 balance of attic venting and roof venting.

The calculator will determine the number of square inches of net free area required for adequate attic ventilation based on the 1 300th general requirement. Vent calculator design your balanced ventilation system. Result of item 1 300. Hence you would need two square feet 600 300 of attic ventilation.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Length x width of attic in feet 150 total sq. If local code requires the 1 150 rule please double the requirements. 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.

Of total vent space needed. Use the duraflo ventilation calculator to determine your home s ventilation requirements. 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. 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.