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

  • Texas State University Completes Stadium Renovations

    Texas State University in San Marcos, Texas, recently announced that it has completed a series of additions and renovations to its football stadium, according to a news release. Formerly known as the Bobcat Stadium End Zone Complex, the Johnny and Nathali Weisman Football Performance Center is an 85,000-square-foot expansion featuring hospitality spaces, banquet spaces, exterior concourses, and upgrades to the field house.

  • Benson Polytechnic High School in Portland, OR

    Preserving Legacy, Designing for the Future

    As historic academic buildings age, institutions face a difficult decision: preserve and adapt or demolish and rebuild. How do we honor the legacy of these spaces while adapting them to meet the needs of modern learners?

  • Geometric abstract school illustration

    How Design Shapes Learning and Success

    Can the color of a wall, the curve of a chair, or the hum of fluorescent lights really affect how a student learns? More schools are beginning to think so.

  • Little Grand Market

    Designing for Belonging: Why Student Wellness Starts with Space

    From walkable site planning to flexible interiors, intentional design choices play a critical role in how students experience comfort, connection, and community.