Attic Ventilation Requirements California

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.

Attic ventilation requirements california.

That is openings doors windows and louvers to the outside should create a. 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. Operable windows are excluded from the options for meeting whole building ventilation requirements. This handout is intended to provide the information regarding proper roof ventilation and insulation clearance.

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. Ventilation guide 2007 california building code 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. In climate zones 14 and 16 a class i or ii vapor retarder is installed on the warm in winter side of the ceiling.

California title 24 part 6 references ashrae standard 62 2 2007 as california s state ventilation code with one exception. 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. 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. The minimum net free ventilating area shall be 1 150 of the area of the vented space.

If your attic is enclosed california s building code states it should have cross ventilation. A strip vent in a soffited eave and frieze block vents in an open framed eave are shown here. Not less than 40 percent and not more than 50. Vents are vulnerable to wildfires when embers and flames enter into the enclosed attic or crawl spaces and ignite combustible materials in those areas.

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