Good stuff. And, to be fair to your man, he didn't claim his house was "fireproof"; all he claimed was that it was "fire resistant" to the best of his ability. Given the public awareness of research on structural resistance to ember attack (fairly extensive after Ash Wednesday 1983, and fairly extensively ignored until after Canberra's 2003 holocaust) it appears he's done better than most.

Cheers, Rowan