Is it good to coat in Cambridge, MA this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Cambridge, 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
- 2.3°F
- Overnight dew
- High
- Rain
- 2%
- Window
- —
High condensation risk overnight — surface dips to within 2.3°F of the 61°F dew point (low 62°F, 5% cloud, 4 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.2°F
- Overnight dew
- High
- Rain
- 1%
- Window
- —
High condensation risk overnight — surface dips to within 1.2°F of the 60°F dew point (low 60°F, 9% cloud, 2 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.5°F
- Overnight dew
- High
- Rain
- 54%
- Window
- —
High condensation risk overnight — surface dips to within 0.5°F of the 67°F dew point (low 67°F, 100% cloud, 6 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.6°F
- Overnight dew
- High
- Rain
- 41%
- Window
- —
High condensation risk overnight — surface dips to within 0.6°F of the 67°F dew point (low 68°F, 17% cloud, 0 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 6.5°F
- Overnight dew
- Low
- Rain
- 7%
- Window
- —
Too hot — high of 104°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 4.8°F
- Overnight dew
- Watch
- Rain
- 42%
- Window
- —
Too hot — high of 105°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 3.1°F
- Overnight dew
- Watch
- Rain
- 43%
- Window
- —
Too hot — high of 101°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 2.3°F of the 61°F dew point (low 62°F, 5% cloud, 4 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Humidity peaks at 96% — well above the 85% ceiling; cure stalls and moisture gets trapped.
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.