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ASCC Position on Responsibility for Slab Curling
February 23, 2010

The American Society of Concrete Contractors (ASCC) has published a new position statement, the latest in a series of papers on key issues of interest to cast-in-place concrete contractors, architects and engineers.

Position Statement #30: Responsibility for Slab Curling explains that while concrete contractors are responsible for initial floor flatness and levelness measured within 72 hours of placement, flatness can change over time, due to curling, which results in raised edges and corners of concrete floor panels.

The paper cites the American Concrete Institute (ACI) and the Canadian Standards Association (CSA) that hold the designer accountable for the control of curling. It explains that mix design, curing and reinforcement should be considered when attempting to minimize curling.

Copies of all of the ASCC Position Statements may be ordered online at

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