Is it good to coat in Boulder, CO this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Boulder, 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
- 15.7°F
- Overnight dew
- Low
- Rain
- 8%
- Window
- 8am–5pm
Clear to coat: temps 57–68°F, RH under 64%, surface stays 15.7°F+ above the dew point, no rain in the cure window.
- Dew margin
- 2°F
- Overnight dew
- High
- Rain
- 11%
- Window
- —
High condensation risk overnight — surface dips to within 2°F of the 45°F dew point (low 44°F, 13% cloud, 2 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 18.3°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- 10am–5pm
Cold mornings (down to 47°F, floor is 50°F) — wait for the surface to warm past midday before you coat.
- Dew margin
- 7.2°F
- Overnight dew
- Low
- Rain
- 3%
- Window
- 8am–5pm
Clear to coat: temps 65–85°F, RH under 31%, surface stays 7.2°F+ above the dew point, no rain in the cure window.
- Dew margin
- 25.5°F
- Overnight dew
- Low
- Rain
- 2%
- Window
- 8am–5pm
Clear to coat: temps 55–78°F, RH under 61%, surface stays 25.5°F+ above the dew point, no rain in the cure window.
- Dew margin
- 21.6°F
- Overnight dew
- Low
- Rain
- 6%
- Window
- 8am–5pm
Hot afternoon (87°F, ceiling 86°F) — coat early and follow the shade.
- Dew margin
- 20°F
- Overnight dew
- Low
- Rain
- 10%
- Window
- 8am–5pm
Clear to coat: temps 68–84°F, RH under 35%, surface stays 20°F+ above the dew point, no rain in the cure window.
- Clear to coat: temps 57–68°F, RH under 64%, surface stays 15.7°F+ above the dew point, no rain in the cure window.
Good to go. 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.
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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.