Any help would be appreciated... I'm just a 'laymen'/seller, our inspector reported a hole in our condo fire wall, square, approx. 24" x24". It would be a lot easier to fix if it was just drywall, but it's wood! (maybe never intended to be a firewall??) Built in 1987, City of Phoenix, Arizona. I tried to access Building Codes but I ran into a lot of 'walls', ha ha. Any suggestions? Should I just glue & nail a square of board over it? Thanks, Sarah