You may want to consider the following from the 2006 OBC - where is the fire seperation required?
184.108.40.206. Separation of Storage Garages
**(4) **Where a *storage garage *is attached to or built into a *building *of residential occupancy,
(a) an *air barrier system *conforming to Subsection 9.25.3, shall be installed between the garage and the remainder of the *building *to provide an effective barrier to gas and exhaust fumes, and
(b) every door between the garage and the remainder of the *building *shall conform to Article 220.127.116.11.
18.104.22.168. Doors between Garages and Dwelling Units
**(1) **A door between an attached or built-in garage and a *dwelling unit *shall be tight-fitting and weatherstripped to provide an effective barrier against the passage of gases and exhaust fumes and shall be fitted with a self-closing device.
**(2) **A doorway between an attached or built-in garage and a *dwelling unit *shall not be located in a room intended for sleeping.
C. Lawrenson, OBC Instructor/Facilitator