Attic Ventilation Requirements Calculator

A 50 x 30 attic would have a total area of 1 500 sq.

Attic ventilation requirements calculator.

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. Width or area. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.

Calculating attic ventilation requirements. According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. Calculate the total vent area needed.

Result of item 1 300. 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. There should also be a 50 50 balance of attic venting and roof venting.

Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. Calculate the square footage of the attic space. Use this calculator to help determine the proper amount of attic ventilation based on u s. Of total vent space needed.

Divide the square footage item 1 by 300. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. In order to find the right calculator divide the attic floor. Home attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards.

Gaf attic ventilation 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. The following are the requirements taken directly from the irc.

Hence you would need two square feet 600 300 of attic ventilation. Length x width of attic in feet 150 total sq. Ft divided by 150 equals 10 sq. The majority of the requirements related to attic ventilation have not changed much from the previous editions.

Vent calculator design your balanced ventilation system.