Washington · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on Washington DOT projects?
Concrete must be maintained at ≥40°F for the first 7 days and ≥35°F thereafter during the Cold Weather Protection Period (7 days or cure duration, whichever is longer). Submit a Type 2 Working Drawing with a cold weather concreting procedure before placement. Install temperature sensors (1 per 100 yd³) 1.5" from concrete face and on surfaces; record temps hourly. If temps fall below 40°F in the first 7 days, no curing time is awarded and the period extends 1 day. If temps fall below 35°F, concrete may be rejected. Extra protection is required for exposed surfaces, corners, edges, thin sections, and steel forms. Review 7-day temperature predictions from NOAA before placement.
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