2016 Cbc Attic Ventilation Requirements

The minimum net area of ventilationopenings shall be not less than 1 square foot 0 0929 m2 for each 150 square feet 14 m2 of under floor area.

2016 cbc attic ventilation requirements. The net free ventilation shall be a minimum ratio of 1 150 of the area or space ventilated e g. Occupiable spaces listed in table 402 1 shall be designed to have ventilation outdoor air for occupants in accordance with this chapter. International building code 2015 ibc 2015 california code of regulations title 24. 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 vertical leg of drip edges shall be a minimum of 1 1 2 inches 38 mm in width and shall extend a minimum of 1 4 inch 6 4 mm below sheathing. The requirements for nonresidential buildings high rise residential buildings and hotels motels are in part 6 sections 120 0 to 120 9 and 130 0 to 141 0. 1212 hcd 1 pollutant control. The net free vent area nfva shall not be less than 1 150 of the area of the space being vented.

Where a fire wall serves as an exterior wall for a building and separates buildings having different roof levels such wall shall terminate at a point not less than 30 inches 762 mm above the lower roof level provided the exterior wall for a height of 15 feet 4572 mm above the lower roof is not less than 1 hour fire resistance rated construction from both sides with openings protected by fire assemblies having a fire protection rating of not less than 3 4 hour. Underlayment shall be installed over drip edges along eaves. California building code 2016 vol 1 2 adopts with amendments. Air space no less than 1 inch must be provided between any insulation or obstruction and the roof sheathing.

1210 toilet and bathroom requirements 1211 hcd 1 hcd 2 garage door springs. 1 square foot of ventilation for each 150. That is openings doors windows and louvers to the outside should create a natural flow of fresh. 1203 ventilation 1204 temperature control.

If your attic is enclosed california s building code states it should have cross ventilation. Mandatory requirements that apply to all building types are in part 6 sections 110 0 110 9. The chart below represents the net minimum area in square inches required for proper ventilation. Ventilation air supply requirements for occupancies regulated by the california energy commission are found in the california energy code.

Blocking and bridging must be arranged so they do not interfere with air movement. One ventilationopening shall be within 3 feet 915 mm of each corner of the building.