From 2010 CALIFORNIA RESIDENTIAL CODE

Attic Ventilation

SECTION R327.6
VENTS

R327.6.1 General. Where provided, ventilation openings for enclosed attics, enclosed eave soffit spaces, enclosed rafter spaces formed where ceilings are applied directty to the underside of roof rafters, and underflow ventilation shall be in accordance with Section 1203 of the California Building Code and Sections R327.6.1 through R327.6.3 of this section to resist building ignition from the intrusion cf burning embers and flame through the ventilation openings.

R327.6.2 Requirements. Ventilaticn openings for enclosed attics, enclosed eave soffit spaces, enclosed rafter spaces formed where ceilings are applied directiy to the underside of'roof' rafters, and underfloor ventilation openings shall be fully covered with metal wire mesh, vents, other materials or other devices that meet the following requirements:

  1. The dimensions of the openings therein shall be a minimum of 1/16th inch (1.6 mm) and shall not exceed 1/8th inch (3.2mm).

  2. The materials used shall be noncombustible.

    Exception: Vents located under the roof covering, along the ridge of roofs, with the exposed surface of the vent covered by noncombustible wire mesh, may be of combustible materials.

  3. The materials used shall be corrosion resistant.

R327.6.3 Ventilation openings on the underside of eaves and cornices: Vents shall not be installed on the underside of eaves and cornices.

Exceptions:

  1. The enforcing agency may accept or approve special eaves and comice vents that resist the intrusion of flame and burning embers.

  2. Vents complying with the requirements of Section S327.6.2 way be installed on the underside of eaves and cornices in accordance with either one of the following conditions:

    2.1. The attic space being ventilated is fully protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 of the California Building Code
    or, .
    2.2. The exterior wall covering and exposed underside of the eave are of non-combustible material, or ignition-resistant=materials as determined in accordance with SFM Standard 12-7A-5 Ignition-Resistant Material and the vent is located more than 13 feet from the ground or walking surface of a deck, porch, patio or similar surface.

From 2007 CALIFORNIA BUILDING CODE

Attic Ventilation

704A.2 Attic ventilation.

  • 704A.2.1 General. When required by Chapter 15, roof and attic vents shall resist the intrusion of flame and embers into the attic area of the structure, or shall be protected by corrosion- resistant, noncombustible wire mesh with openings a minimum of 1/8-inch (3.2 mm) and shall not exceed 1/4-inch (6 mm) or its equivalent.
  • 704A.2.2 Eave or cornice vents. Vents shall not be installed in eaves and cornices. Exception: Eave and cornice vents may be used provided they resist the intrusion of flame and burning embers into the attic area of the structure.
  • 704A.2.3 Eave protection. Eaves and soffits shall meet the requirements of SFM 12-7A-3 or shall be protected by ignition- resistant materials or noncombustible construction on the exposed underside.

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