Wind at height, slick surfaces, lightning, and roof-deck heat decide a roofing day. CrewCast checks all four against your job-site forecast, hourly, for free.
| Factor | Caution | Stop work |
|---|---|---|
| Wind | >15 mph — gusts affect footing and sheet handling | >25 mph — unsafe for scaffolds and material handling |
| Surface | Morning dew drying | Wet or icy — fall risk; OSHA stop-work territory |
| Lightning | Storms within earshot | Any thunder — clear the roof immediately, wait 30 minutes after the last strike |
| Roof heat | ≥90°F surface — hydrate, rotate crews | ≥103°F surface — direct sun adds up to ~13°F over the air heat index |
A roof deck in Florida summer sun routinely runs 10–13°F hotter than the reported heat index — which is why a "92°F day" can be a 105°F roof. CrewCast computes the roof-surface estimate for you.
The app evaluates your job-site coordinates each hour: wind speed and gusts, precipitation and surface wetness, lightning risk from storm cells, and heat-index-plus-sun-load. You get a plain Conditions Favorable / Caution / Not Recommended verdict, the best work window for the next 12 hours, and an optional evening push alert when tomorrow looks like a no-go.
General industry practice: use caution above 15 mph and stop roofing work above 25 mph sustained wind — lower if you're handling large sheets, working steep pitches, or your equipment manual says so. Gusts matter more than averages.
Not until the surface is dry. Wet shingles, underlayment, and sheathing are a serious slip hazard, and most manufacturers void adhesion specs applied to wet decks. After rain, check surface dryness — not just the sky.
When the roof-surface heat estimate reaches about 103°F, heat illness risk is high — schedule early-morning work, mandatory shade breaks, and water. Direct sun can add roughly 13°F over the ambient heat index (OSHA guidance).
No. CrewCast is guidance built on NWS, NOAA, and Open-Meteo data. Official NWS warnings always take precedence, and site supervisors make the final call.