California Attic Ventilation

Ventilation air supply requirements for occupancies regulated by the california energy commission are found in the california energy code.

California attic ventilation.

Authority for regulating ventilation in buildings is left up to each state and usually that authority is delegated to local jurisdictions counties and cities. 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. The chart below represents the net minimum area in square inches required for proper ventilation. In the summer natural air flow in a well vented attic moves super heated air out of the attic protecting roof shingles and removing moisture.

Attic ventilation serves two main functions. California title 24 part 6 references ashrae standard 62 2 2007 as california s state ventilation code with one exception. To lower attic temperatures and to remove excess moisture. Proper insulation and air sealing also keeps attics cold in winter by blocking the entry of heat and moist air from below.

If your attic is enclosed california s building code states it should have cross ventilation. Proper attic ventilation can help reduce the load on your air conditioner. See the benefits of attic ventilation get automatic lifetime protection on your entire gaf roofing system when you install any gaf lifetime shingle and at least 3 qualifying gaf accessories you ll automatically get a lifetime limited warranty on your shingles and all qualifying gaf accessories. Vents attic and crawl space vents are incorporated into buildings to help remove excess moisture that can move into these spaces either from the soil in the case of a crawl space or from the living space in the case of attics and cathedral ceilings.

Attic ventilation estimating tool. That is openings doors windows and louvers to the outside should create a natural flow of fresh. Operable windows are excluded from the options for meeting whole building ventilation requirements. Use this tool to estimate the ventilation needs for your attic and get a list of broan attic ventilation product that will meet your needs.

Get started indoor air quality iaq poor indoor air quality can have a negative effect on your home. To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now. Table 402 1 minimum ventilation rates in breathing zone 1 2 4 ashrae 62 1. Replacing your bathroom fan range hood or even installing a new fan.