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

  • Harvard Announces Replacement Facility for Native American Program

    Harvard University in Cambridge, Mass., recently announced that construction will begin this spring on a new home for its Native American Program, according to university news. The 6,500-square-foot, all-electric building will stand three stories and serve as the central hub for the Harvard University Native American Program (HUNAP).

  • University of Oklahoma Announces New Campus Master Plan

    The University of Oklahoma in Norman, Okla., recently announced that it will soon launch a new, comprehensive Campus Master Plan to guide the campus’ physical development during the next decade, according to a news release.

  • Universities Continue to Launch Multimillion-Dollar Campus Transformations

    What makes the current wave of campus development especially noteworthy is its emphasis on multi-use functionality and community integration. Institutions are no longer investing solely in academic or athletic facilities in isolation. Instead, they are creating destinations that blend recreation, health, housing, and event-driven economic activity.

  • Fargo, N.D., Starts Construction on Consolidated Elementary School

    Fargo Public Schools in Fargo, N.D., recently announced the beginning of construction on a new elementary school, according to a news release. The district partnered with ICON Architectural Group and Kraus-Anderson Construction on the new Horace Mann Elementary School.