Technical Questions - ACI Concrete Knowledge Center
What are “superflat” floors?
Q. What are “superflat” floors?
A. ACI 302.1R-04, “Guide for Concrete Floor and Slab Construction,” defines several classes of floors based on their intended use and the suggested method used for final finishing. Class 9 floor are superflat and require critical surface tolerance.
Defined-traffic superflat floors must support vehicular traffic along paths that are defined before construction and don’t change during the life of the floor. Distribution centers with very narrow aisles and high racking systems fall into this category.
Random-traffic superflat floors should support traffic in all directions. These floors are typically required for gymnasiums, ice rinks, warehouses in which air-pallets are used, and television or movie studios on which camera dollies must operate.
Superflat floors generally exhibit FF and FL numbers above 50 in the direction of travel. They require specialized construction methods, and the labor cost for building such floors is higher than the cost for building floors in standard warehouses, lightly trafficked industrial buildings, or commercial office buildings.
Disclaimer: Questions in this column were asked by users of ACI documents and have been answered by ACI staff or by a member or members of ACI technical committees. The answers do not represent the official position of an ACI committee. Only a published committee document represents the formal consensus of the committee and the Institute.