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

  • Nashville Elementary School Receives LEED Gold Certification

    Goodlettsville Elementary School, part of Metro Nashville Public Schools in Nashville, Tenn., recently achieved LEED Gold Certification from the U.S. Green Building Council (USGBC), according to a news release. The 81,750-square-foot school opened in 2023 and was designed by Goodwyn Mills Cawood (GMC).

  • Building Beyond Simulation: Creating Immersive Ecosystems for Healthcare Education

    Health sciences education is one of the fastest-growing facility types in colleges and universities. The demand for medical, nursing, and allied health professionals is driving the creation and renovation of medical simulation training facilities that provide students with real-world experience through advanced simulation-based learning.

  • 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.

  • University of Pennsylvania Releases Design of Future Physical Sciences Building

    The University of Pennsylvania (Penn) in Philadelphia, Penn., recently released renderings of an upcoming 350,000-square-foot Physical Sciences Building, according to news release. The facility was designed by CO Architects and will unite the university’s departments of Physics and Astronomy, Mathematics, and Earth and Environmental Science.