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ASCC Publishes Tolerances Book
February 11, 2009

The American Society of Concrete Contractors has published Tolerances for Cast-In-Place Concrete Buildings: A Guide for Specifiers, Contractors and Inspectors, written by Bruce Suprenant, PhD, P.E., and Ward Malisch, PhD, P.E. The authors suggest tolerances that are based on as-built measurements of buildings and other structures that have performed satisfactorily.

The book is divided into two sections. Section 1 includes the suggested tolerance language to be included in specifications. Section 2 gives extensive background information to support the tolerances in Section 1. The book will help owners, specifiers, and contractors to avoid the tolerance traps that cause schedule delays, construction claims, and their associated costs. Disputes involve cast-in-place concrete tolerances cost owners, specifiers, and contractors time and money. The problem stems from tolerances that are virtually unachievable. For the first time the ASCC compares concrete tolerance requirements with as-built measurements of concrete structures, which show that many accepted tolerances can result in schedule delays, construction claims, and avoidable costs for arbitration or litigation.

Dr. Suprenant is the founder and owner of Concrete Engineering Specialists, a concrete consulting firm based in Boulder, Colorado. Dr. Malisch is the technical director of the ASCC. He was senior managing director of the American Concrete Institute. Both men were editors of Concrete Construction magazine.

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