Estimating Cold-Weather Concrete: Allowances for Temporary Heat, Blankets & Accelerators
Pouring concrete below 40°F demands significant winterization allowances that casual bids often overlook. Calculate fuel consumption for indirect-fired heaters, curing blanket rental durations, hot-water batch plant surcharges, and non-chloride accelerator additives accurately.
Sarah Jenkins, PE
Director of Preconstruction Engineering
Executive Estimator Takeaways
- Account for batch plant cold-weather surcharges ($8 to $15 per cubic yard) during winter months.
- Calculate propane or natural gas BTUs required to maintain 50°F ambient curing temperature for 72 hours.
- Include labor hours for deploying, weighing down, and rolling up thermal insulated blankets.
1. ACI 306R-16 Cold Weather Guidelines and Cost Implications
The American Concrete Institute (ACI) specifies strict temperature thresholds. If the ambient temperature falls below 40°F (4°C) for more than three consecutive days, winter protection procedures become legally mandatory under standard project specifications.
2. Estimating Temporary Enclosure and Heating Systems
Hoarding tariffs, fire-retardant poly sheeting, reinforced lumber framing for temporary enclosures, and certified fuel tenders can easily total $30,000+ on a mid-sized commercial building foundation.
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