Garage Firewall

Home Inspector with Home Inspector/Structural Engineer/Mold Assessor

For your family's safety, attached garages require a properly installed firewall.  It consists of 1/2 inch type "X" wallboard on walls adjoining the home, and 5/8 inch wallboard on the ceiling, if there is living space over a garage.  Also, the door to the house needs to be a 20-minute rated fire door that is solid wood or metal 1 3/8 inche thick. 

Comments (2)

Randall Schrader
Competitive Insurance of Dundee - Dundee, FL

1 3/8 inch thick door doesn't sound to safe.  Are you sure that is correct?

Oct 08, 2008 03:39 AM
Greg Bertaux

Dear Mr. Schrader,

The door information is correct as stated in the  Florida Building Codes,  Residential Code Chapter three:

R309.1 Opening protection.
Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 13/8 inches (35 mm) in thickness, solid or honeycomb core steel doors not less than 13/8 inches (35 mm) thick, or 20-minute fire-rated doors.

Thank you for your inquiry.

Gregory J. Bertaux P.E.,



Oct 08, 2008 04:14 AM