Originally Posted by
Richard Moore
Absolutely NOT! The purpose of the "firewall" ...
Nooooo ... don't use the word "firewall" as it is not a "firewall" ...
It is a "separation wall" and, as shown in the photo, it does not provide the required "separation" between the garage and the living space.
As I see it, there are two choices: 1) close that gap up with at least 1/2" gypsum board; 2) go to all the expense and trouble to cover the underside of the floor above the crawlspace with 5/8" Type X gypsum board.
I suspect 1) above would be *much cheaper*.
