Redneck, let me tell you about my house, just the roof. The rafters are 2x6 rough cut poplar. The roof was slate so it is covered by 1 inch thick purlins with about 1/2" gap average in between.
Two year ago I stripped that slate. I re-shot all the purlins with 3" ring shanks. Then I did an overlay with 5/8" OSB and shot that with 8 penny ring shanks. Then I went around the inside and installed two hurricane clips on each rafter.
I think it would take a pretty big blow to take that roof off.
