Section 1907.1 of Chapter 19 of the California Building Code is amended to read:
1907.1 General. The thickness of concrete floor slabs supported directly on the ground shall be not less than 3 ½ inches (89mm). A 6-mil (0.006 inches; 0.15mm) polyethylene vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the base course or subgrade and the concrete floor slab, or other approved equivalent methods or materials shall be used to retard vapor transmission through the floor slab. Slabs shall have 6x6-10/10 wire mesh or equate a mid-height.
Exceptions: A vapor retarder is not required:
1. For detached [. . .]
(Ord. 5564 § 1 (part), 2022)