Attic Ventilation Requirements Calculator

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.

Attic ventilation requirements calculator.

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. Calculate the square footage of the attic space. 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. The two square feet is divided equally between the intake and the exhaust one square foot for each.

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

Ft divided by 150 equals 10 sq. Of total vent space needed. Enter square footage calculate or enter the square footage of the attic or area to be vented. Intake vents located at the lowest part of the roof under the eaves.

Divide the square footage item 1 by 300. Calculate the total vent area needed. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph. Result of item 1 300.

Use the duraflo ventilation calculator to determine your home s ventilation requirements. Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards. 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. Use this calculator to help determine the proper amount of attic ventilation based on u s.

A 50 x 30 attic would have a total area of 1 500 sq. 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. In order to find the right calculator divide the attic floor. Calculating attic ventilation requirements.

Vent calculator design your balanced ventilation system. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. Hence you would need two square feet 600 300 of attic ventilation.