406.3.2.1 Dwelling Unit Separation

The private garage shall be separated from the dwelling unit and its attic area by means of gypsum board, not less than ¹/₂ inch (12.7 mm) in thickness, applied to the garage side. Garages beneath habitable rooms shall be separated from all habitable rooms above by not less than a ⁵/₈-inch (15.9 mm) Type X gypsum board or equivalent and ¹/₂-inch (12.7 mm) gypsum board applied to structures supporting the separation from habitable rooms above the garage. Door openings between a private garage and the dwelling unit shall be equipped with either solid wood doors or solid or honeycomb core steel doors not less than 1³/₈ inches (34.9 mm) in thickness, or doors in compliance with Section 716.2.2.1 with a fire protection rating of not less than 20 minutes. Doors shall be self-closing and self-latching.