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

  • Fellowes Expands Finish and Wall-Covering Options for Architectural Wall Systems

    Fellowes Architectural Solutions has expanded the materials library for its architectural wall systems with a series of new finishes and wall-covering options intended to provide architects and designers with additional choices for commercial interiors, according to a company news release.

  • Planning with Clarity: Using AI to Make Better Campus Decisions, Not Just Better Designs

    Higher education leaders are being asked to make increasingly high-stakes decisions about campus facilities amid greater uncertainty than ever before. Social and economic pressures, shifting enrollment, and evolving learning models compete with growing deferred maintenance needs to strain even the most robust infrastructure budgets.

  • UCF Modernizes College of Hospitality Management

    The University of Central Florida in Orlando, Fla., recently completed a major renovation effort for the Rosen College of Hospitality Management, according to a news release. The project modernized 77,600 square feet worth of academic classrooms, teaching labs, and collaborative spaces to support both students and faculty.

  • URI Cuts Underwater Ribbon on New Ocean Robotics Laboratory

    The University of Rhode Island recently held a ribbon-cutting ceremony for a new Ocean Robotics Laboratory at its Narragansett Bay Campus, according to a news release. Two students used a remotely operated vehicle to cut an underwater ribbon in a 30-by-20-foot test tank.