Good points overall. A couple things I'd add from experience: - Structural checks first, definitely. But don't underestimate water intrusion—even min...

- Yep, learned this lesson too—underlayment's crucial, especially in colder climates. - Also worth checking flashing details around chimneys and vents...

Definitely agree with this. I've done a fair bit of TPO welding myself, and ambient conditions can really mess with your settings. A few quick thought...

Agreed—definitely sounds like inconsistent galvanizing or plating at the factory. Had a similar issue a few years back; nails from the same box varied...