Missing shingles and the envelope cascade

A few missing shingles look cosmetic from the ground — until the inspector connects them to the water stain in the top-floor unit and the envelope story writes itself. This thread is for the cascade: how small exterior misses become interior deficiency lists, and the drone or binocular checks that catch them early.

The cascade is the lesson inspectors teach us for free: a small exterior miss becomes an interior stain, the stain becomes a deficiency, and the deficiency list starts telling a story about the whole envelope. Catching it at the shingle stage is the cheap version. Whatever your method — and a ground-level binocular pass after every big wind event catches more than people expect — the point is a method, on a rhythm. What catches your envelope problems first — drone, binoculars, a roof walk, or the ceiling stain that means you're already late?