1. From 2007 Ca. Building code: "1203.2 Attic spaces. Enclosed attics and 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..."
This current language REQUIRES ventilation and drops the following language which was in the 2001 Ca. Building Code:"1505.3 Ventilation. Where determined by the building official...due to atmospheric or climatic conditions,enclosed attics and and enclosed rafter..."
Q.: What is the background leading to the explicit requirement for ventilation and the deletion of the contingent requirement based on a Building Official determination?
2."Rafters" generally are defined as sloped members.
Q.: In the same assembly for a flat roof
(low-slope)using roof "joists" wouldn't the same requirement apply? In other words since the word "joists" is not in the code language does that somehow imply that ventilation would not be required in a flat or low slope if everything else was the same?
Thanks for your help,