As Mark K stated, some local jurisdictions amend the code. The city has amended the current CBC/CRC to be more restrictive per CA state code. That is the key to an amendment, it has to be more restrictive. We have three amendments. One is for footings & frost line - CBC/CRC states 12" depth, we amended for 18" depth. We also upped the wind and snow loads due to local climatic conditions.
Sue, in the frozen high desert........-12, -15, and -17 at night this weekend..............brrrrrrrrrrrrr!