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

  • sapling sprouting from a cracked stone

    Lessons in Resilience: Disaster Recovery in Our Schools

    Facility managers play a pivotal role in how well a school weathers and recovers from a crisis. Whether it's a hurricane, a flood, a tornado, or a man-made event, preparation determines resilience.

  • 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?

  • NWEA Report Recommends K–12 Natural Disaster Recovery Strategies

    The Northwest Evaluation Association (NWEA), a K–12 assessment and research organization, recently announced the release of a new playbook for schools and communities recovering from extreme weather events, according to a news release.

  • Niles West High School Natatorium Renovation

    Natatoriums are highly specialized spaces, and luminaires in this setting face several unique challenges. Perhaps the most significant is corrosion, which is exacerbated by high indoor humidity, condensation, and pool chemicals, often resulting in material degradation in luminaires not certified to perform in corrosive environments.

Digital Edition