Roof Attic Vent Spacing

Poor ventilation practices under the roof deck can lead to excessive energy loss ice dams mold and even rot.

Roof attic vent spacing.

What does the code require. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. This pk topic provides commonly accepted ventilation practices compatible with a decra roof system installation.

Of vent for every 300 sq. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. The key to proper ventilation of your roof and attic is balance. Ventilation can be accomplished using various products and techniques.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. Building codes vary. Proper attic area ventilation is an important performance consideration for a home or building with a steep slope roof. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed.

In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. Typically building codes include minimum attic space ventilation requirements as well as the roofing industry weighing in on practical guidelines.