1203 2 Attic Spaces

Los angeles building code 12 interior environment 1209 access to unoccupied spaces 1209 2 attic spaces jump to full code chapter an opening not less than 20 inches by 30 inches 559 mm by 762 mm shall be provided to any attic area having a clear height of over 30 inches 762 mm.

1203 2 attic spaces.

Openings for ventilation having a least dimension of not less than 1 16 inch. The net free cross ventilation area shall be permitted to be reduced to 1 300 where a class i or ii vapor barrier is installed on the warm inwinter side of the ceiling. Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds squirrels rodents snakes and other similar creatures. These spaces are formed where ceilings are applied directly to the underside of roof framing members.

Exterior openings into the attic space of any building intended for human occupancy shall be covered with corrosion resistant wire cloth screening hardware cloth perforated vinyl or similar material that will prevent the entry of birds squirrels rodents snakes and other. 1203 2 attic spaces enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing members shall have cross ventilation for each separate space by ventilation openings protected against the entrance of rain and snow. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing members shall have cross ventila tion for each separate space by ventilation openings protected against the entrance of rain and snow. 1203 2 1 openings into attic.

1203 2 attic spaces shall have cross ventilation the net free ventilating area shall not be less than 1 150th of the area of the space ventilated. Enclosed attics andenclosedrafter spaces formed where ceilingsare applied directlyto theunder side of roof framing members shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain and snow. International building code 1203 2 1. Overall proper roof ventilation can play a critical role in preserving the life of the roof and building performance especially in light of ever changing weather conditions.

Specific language addressing cross ventilation requirements in enclosed attic or rafter spaces is available in the 2012 ibc section 1203 2 ventilation attic spaces. Blocking and bridging shall be arrangedsoasnottointerferewiththemovementofair amin. Ibc 1203 2 requires 1 150 th of the attic area to be ventilated but there is an exception that is commonly used instead.