Attic Ventilation Requirements Calculator

Width or area.

Attic ventilation requirements calculator.

The two square feet is divided equally between the intake and the exhaust one square foot for each. 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. If local code requires the 1 150 rule please double the requirements. The following are the requirements taken directly from the irc.

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

In order to find the right calculator divide the attic floor. Calculating attic ventilation 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. Calculate the total vent area needed.

The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. Divide the square footage item 1 by 300. Calculate the square footage of the attic space. There should also be a 50 50 balance of attic venting and roof venting.

Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. Hence you would need two square feet 600 300 of attic ventilation. 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. Length x width of attic in feet 150 total sq.

If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. The majority of the requirements related to attic ventilation have not changed much from the previous editions. A 50 x 30 attic would have a total area of 1 500 sq.

According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. Vent calculator design your balanced ventilation system. Result of item 1 300. 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.

Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards.