Attic Ventilation Requirements California

1203 2 under floor ventilation.

Attic ventilation requirements california.

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. A strip vent in a soffited eave and frieze block vents in an open framed eave are shown here. Ventilation guide 2007 california building code attic ventilation. 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.

If your attic is enclosed california s building code states it should have cross ventilation. That is openings doors windows and louvers to the outside should create a. In climate zones 14 and 16 a class i or ii vapor retarder is installed on the warm in winter side of the ceiling. Operable windows are excluded from the options for meeting whole building ventilation requirements.

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. The minimum net free ventilation area shall be 1 300 of the vented space provided one or more of the following conditions are met. 1203 3 the uniform building code requires enclosed attic spaces enclosed rafter spaces and under floor areas to be ventilated by not less than 1 square foot for each 150 square feet of attic under floor area. Vents are vulnerable to wildfires when embers and flames enter into the enclosed attic or crawl spaces and ignite combustible materials in those areas.

This handout is intended to provide the information regarding proper roof ventilation and insulation clearance. G forms handouts building attic ventilation docx page 1 of 1 a ttic v entilation purpose enclosed attics and enclosed rafters are required by the california residential code to have proper ventilation. These requirements cover the design and construction of roof ceiling systems including roof framing roof drainage roof sheathing ceiling finishes roof ventilation and attic access. A ridge vent and through roof vents can be seen on the roof of the building shown here.

Roof ceiling construction requirements are listed in california residential code chapter 8.