Is it good to coat in Charleston, WV this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Charleston, built from the local forecast against the 5°F-above-dew-point rule. We lead with the signal a weather app misses: overnight condensation risk.
- Dew margin
- -2.2°F
- Overnight dew
- High
- Rain
- 41%
- Window
- —
High condensation risk overnight — surface dips to within -2.2°F of the 70°F dew point (low 67°F, 2% cloud, 3 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 2.9°F
- Overnight dew
- High
- Rain
- 3%
- Window
- —
High condensation risk overnight — surface dips to within 2.9°F of the 71°F dew point (low 71°F, 3% cloud, 4 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- -0.7°F
- Overnight dew
- High
- Rain
- 1%
- Window
- —
High condensation risk overnight — surface dips to within -0.7°F of the 70°F dew point (low 69°F, 0% cloud, 2 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- -0.4°F
- Overnight dew
- High
- Rain
- 1%
- Window
- —
High condensation risk overnight — surface dips to within -0.4°F of the 68°F dew point (low 68°F, 100% cloud, 3 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.2°F
- Overnight dew
- High
- Rain
- 5%
- Window
- —
High condensation risk overnight — surface dips to within 1.2°F of the 68°F dew point (low 69°F, 33% cloud, 2 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.9°F
- Overnight dew
- High
- Rain
- 30%
- Window
- —
High condensation risk overnight — surface dips to within 0.9°F of the 70°F dew point (low 71°F, 9% cloud, 1 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 5.7°F
- Overnight dew
- Low
- Rain
- 30%
- Window
- —
Too hot — high of 99°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- High condensation risk overnight — surface dips to within -2.2°F of the 70°F dew point (low 67°F, 2% cloud, 3 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Humidity peaks at 97% — well above the 85% ceiling; cure stalls and moisture gets trapped.
- Rain likely in the 24h cure window (41% chance, ~1.9mm) — it can wash out or mar an uncured coat.
Hold off. These are forecast numbers — confirm the surface temperature on-site before you start.
Why these thresholds
Installing within 5°F of the dew point causes amine blush / carbamation — a cloudy, greasy, hazed floor. The slab surface temp, not the air, is what counts.
- • Surface temp must stay 5°F above the dew point through application and cure (ASTM D3276 / ISO 8502-42).
- • Air + surface in the 50–86°F band (low-temp lines to 50°F).
- • Humidity under 85%; ideally under 80%.
- • No rain for 24h after application.
- • We use the forecast ground-surface temperature as a surface-temp proxy — confirm on-site with an IR thermometer.
Free in the beta
Watch this job site 24/7
Get an email the moment overnight dew, rain, or an out-of-range stretch threatens a fresh coat — and a morning digest with the best window ahead. No app to check; we watch the forecast for you.