NYCDOB: Best Practices -Concrete in Cold Weather, Structurally Compromised Building Report Filing Process
NYCDOB REMINDER: Concrete Safety Managers, Construction Managers, Superintendents, and Project Managers Should Maintain Best Practices to Prevent Structural Damage to Concrete During Cold Weather Placement
Cold weather concreting practices must be instituted when the average daily air temperature is less than 40° F for more than 3 consecutive days or when the air temperature is 50° F or less for more than 12 hours in any 24-hour period.
To prevent concrete damage due to freezing and ensure proper mixture, follow these safeguards:
Conduct pre-construction meetings with the concrete supplier
Maintain a cold weather concreting plan Inspection
Record surface and air temperatures and ensure no ice is present within forms prior to placement.
Inspect the surface (subgrade, form, rebar, etc.) that is in contact with fresh concrete to ensure temperature is within limitation.
Provide protection immediately after concrete placement. Provide extra protection to formwork corners and edges, which are vulnerable to freezing
Maintain curing conditions that resemble normal strength development
Remove insulation and protection slowly at the end of the required period so surface temperature decreases gradually during the subsequent 24-hour period
Limit rapid temperature change and monitor concrete temperature for a minimum of 24 hours after concrete is placed.
Cold weather mix designs may require prior approval by the EOR
Use of accelerators, hot water, and aggregates must be approved by the EOR
Field inspectors from the concrete testing lab must record temperatures during concrete placement. Special inspectors from the concrete testing lab must record the temperature of the concrete in place in time intervals
For additional information, refer to ACI 306R, ACI 318, NYC BC 2022.
Owners of buildings that are potentially structurally compromised are required by Article 217 of the New York City Administrative Code to hire a New York State licensed design professional to inspect the structure within 60 days of the building becoming structurally compromised and file a report with the Department of Buildings within 30 days after the inspection.
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Robert “Bobby” D’Alessio, is a former New York City Department of Buildings Senior Executive Director of Construction Safety. Mr. D’Alessio’s focus is predominately in the areas of construction code and safety analysis for our clients’ major new building and renovation projects in the New York City and surrounding regions.
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