Skip to main content
Add as a preferred source on Google

Concrete Slab Configuration Raises Concerns Among Sports Flooring Installers

  • 01/23/18

OAKBROOK TERRACE, IL – Concrete slab configuration is very important in the success of a new maple floor installation.  Placing a below-slab vapor barrier directly beneath the concrete slab is proper and typical.  Placing any type of fill material between the below-slab vapor barrier and the concrete slab frequently causes moisture-related problems with the finished maple surface.

The Maple Flooring Manufacturers Association (MFMA) requires the general contractor to provide a concrete slab troweled smooth and flat to a tolerance of 1/8 of an inch in a 10-foot radius, subject to the approval of the MFMA wood flooring contractor. By placing sand between the vapor barrier and the slab, a flatter concrete slab with less initial curling can be produced.  However, this configuration allows the sand to act like a sponge—trapping moisture within the sand layer during the concrete pour. Over time, trapped moisture can migrate up through the concrete slab and cause moisture-related difficulties with subfloor components and the finished wood flooring surface.

The only MFMA-recognized method for reading concrete moisture levels within a slab is by testing its relative humidity. Please refer to the instructions of the manufacturer’s relative humidity test kit for complete details on how to administer the test correctly. MFMA recommends the relative humidity level for a concrete slab for a non-glue-down maple floor system be 85 percent or lower and for glue down systems the concrete slab relative humidity level should be 75 percent or lower before installation.For concrete relative humidity conditions above MFMA’s recommendation consult your MFMA Sport Floor Contractor or your MFMA Manufacturer.

For more information regarding variations to MFMA’s recommended concrete slab configuration, please contact MFMA’s technical director at 888/480-9138 or email [email protected].

Featured

  • Tennessee Middle School Completes Health, Life Safety Renovations

    The Giles County Board of Education in Pulaski, Tenn., recently announced that a series of renovation projects has been completed at Bridgeforth Middle School, according to a news release. The district partnered with Wold Architects & Engineers and Brindley Construction to modernize building systems at one of the district’s oldest schools.

  • DFW-Area District Opens New Replacement Middle School

    The Eagle Mountain-Saginaw Independent School District near Fort Worth, Texas, recently held a ribbon-cutting ceremony for a new replacement middle school campus, according to a news release. The new facility for Wayside Middle School, originally established in 1964, was built on the site of the former district administration building and funded through Bond Proposition A in 2023.

  • University of Kansas Breaks Ground on Entrepreneurship Hub

    The University of Kansas in Lawrence, Kan., recently held a groundbreaking ceremony for the new KU Entrepreneurship Hub, according to university news. The Hub is part of the university’s School of Business and will include spaces for experiential learning and programming.

  • Ohio State University Opens 26-Story Hospital

    The Ohio State University Wexner Medical Center recently opened in Columbus, Ohio, standing 26 stories and covering 1.9 million square feet, according to a university news release. The project marks ten years of effort and is the university’s largest single-facility construction project ever.