03/16/2026
Why did my properly-installed 130mph wind rated shingles blow off in an 80mph wind?
1) Sustained wind reported by National Weather Service is 80mph, measured at 10m
2) Conversion to an average engineering assumption of 1.4x makes a single realistic weather event of 112mph during 80mph sustained winds
3) Ground level conversion back DOWN to 95.2mph, since windspeed would be higher at 33ft than 6ft
4) Adjust for roof height, exposure, shape, and directional lie makes the wind exposure to the shingles at a conservative 138.04mph
5) Edge uplift equivalent puts it well over 150mph