California Attic Ventilation

To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now.

California attic ventilation.

Lowering the temperature in the attic can help reduce air conditioning energy costs and roof deck temperature optimize the service life of a roof covering and minimize ice damming. Proper attic ventilation can help reduce the load on your air conditioner. Get started indoor air quality iaq poor indoor air quality can have a negative effect on your home. 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.

Proper insulation and air sealing also keeps attics cold in winter by blocking the entry of heat and moist air from below. Ventilation air supply requirements for occupancies regulated by the california energy commission are found in the california energy code. If your attic is enclosed california s building code states it should have cross ventilation. The chart below represents the net minimum area in square inches required for proper ventilation.

The insulation will resist heat transfer into the house. 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. To lower attic temperatures and to remove excess moisture. 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. A code may require that a standard be met. Table 402 1 minimum ventilation rates in breathing zone 1 2 4 ashrae 62 1. Attic ventilation estimating tool.

California title 24 part 6 references ashrae standard 62 2 2007 as california s state ventilation code with one exception. 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. Operable windows are excluded from the options for meeting whole building ventilation requirements. 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.