The placement of concrete pads under large fixed bleachers has become more common in an effort to reduce overall installation costs in an area of a gymnasium floor that gets little use. The transition between such concrete pads and the adjacent wood floor system often consists of a metal threshold transition plate.

The use of concrete pads to support bleachers in the closed position, and the installation of a transition plate to the wood floor system is, in many cases, an unworkable design for a motor-driven bleacher system — particularly a large bleacher system.

The best solution to minimize potential difficulties that often occur with the combination of a resilient floor system, concrete pads, and large bleachers is to fully extend the flooring system under the bleachers in a stack position and incorporate sufficient bleacher blocking under the location where the bleachers will rest in the closed position.  The installation of solid blocking under bleachers in the stacked position is necessary to eliminate deflection associated with heavy bleachers. If cost remains a concern, consider using a lower grade of flooring in areas under bleacher banks.

The Maple Flooring Manufacturers Association (MFMA) refers all inquiries concerning subfloor bleacher blocking requirements to the individual flooring system manufacturer and the specified bleacher manufacturer. Variances in bleacher system design, loading, total weight, and operation make uniform specifications for subfloor blocking impossible.

If you have any additional questions, please contact MFMA’s Technical Director at 888-480-9138.

Revised 11/15
Disclaimer: The MFMA provides general information to architects, specifiers and consumers. The MFMA, its members, officers and agents disclaim any responsibility whatsoever for the accuracy or applicability of these guidelines under all circumstances and conditions.
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