Cbc Attic Ventilation

1210 toilet and bathroom requirements.

Cbc attic ventilation.

1 square foot of ventilation for each 150 square feet of attic space. Previously adopted significant changes aligning with current industry standards include increasing from 3 000 psi to 4 000. 1208 interior space dimensions. 2016 cbc and the july 1 2018 supplement are being repealed and coadopted with oshpd.

1203 3 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. Each vent shall terminate not less than 10 feet 3048 mm from or not less than 3 feet 914 mm above an openable window door opening air intake or vent shaft or not less than 3 feet 914 mm in every direction from a lot line alley and street excepted. 1212 hcd 1 pollutant control. 1209 access to unoccupied spaces.

The chart below represents the net minimum area in square inches required for proper ventilation. Attic ventilation cbc 1203 2 and crc r806 2 provide cross ventilation at all attic and enclosed rafter spaces. That is openings doors windows and louvers to the outside should create a natural flow of fresh. If your attic is enclosed california s building code states it should have cross ventilation.

1211 hcd 1 hcd 2 garage door springs. The net free ventilation shall be a minimum ratio of 1 150 of the area or space ventilated e g.