Here too, but unless it is attached, or close to a Property line, no need for one-hourIf it is Accessory no, if it is Additional, yes....At least around here....And the entire garage would have to meet current energy code including floor/slab...That is what usually gets them here, but you do not have as harsh of a climate...Can you use 721 IBC or whatever the archaic assemblies section is?
If the joist are 16" OC then you can use IBC chapter 7 other wise it is not hard to find one hour floor ceiling assemblies
Remember the fireside is the ceiling and 2 layers of type X or C is all most assemblies use
The fireside for supporting construction in the conversion of the garage is the interior side so again it will be a simple single or double layer to achieve this unless CA have amended the IRC
California Department of Housing and Community DevelopmentPoster is from Daly City, CA; what say you to CBC requirements Mark,.
is this a local AHJ call?
Existing 2 story home would like to convert the existing 1st floor Garage to ADU. Code section R302.3 requires a 1-hr floor assembly between the two dwelling units, and 1-hr rating at the supporting construction. What have you seen as design solutions. People will not want to reconstructed the floor assembly to create the 1-Hr rated assembly.
One possible solution is shown in the link below:
I am looking for a tested listed and approved retrofit 1-hr fire rated floor assembly or any creative solutions.
Any help or insight would be greatly appreciated.