House Attic Ventilation Requirements

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

House attic ventilation requirements. Ansi ashrae standard 62 2 is the national consensus standard on residential ventilation in the united states. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. Attic ventilation requirements how many attic vents your roof needs industry standard for proper attic ventilation recommends for no vapor retarder type of attic insulation no paper plastic or aluminum layer between the attic floor and insulation layer 1 sq. Attic ventilation is an important part of keeping your building healthy.

If your attic is enclosed california s building code states it should have cross ventilation. The following are the requirements taken directly from the irc. Current regulations state that the minimum attic ventilation requirements are 150 1. 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.

Near ridge of the roof. Ventilation codes are regulations with the force of law. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation. Foot of ventilation for every 150 sq.

That is openings doors windows and louvers to the outside should create a. Based on your 1100 sq. In the u s no national ventilation code exists. Of vent for every 300 sq.

Building codes vary. This means that if you have a 1500 sq attic then you would need at least 10 sf of ventilation. Always have a balanced ventilation system. 1500 150 10 so if this is the minimum is it ok to have more.

Feet of attic space divided 50 50 between the inlets and outlets. Government codes utility programs and private energy programs often cite national standards as part of their requirements.