WSFI requires the general contractor to provide a concrete slab troweled smooth and flat to a tolerance of 1/8" in a 10' radius, subject to the approval of the WSFI Sport Floor Contractor.
 
Labor and materials necessary to put the concrete slab in acceptable condition, (high areas ground down and low areas filled with appropriate manufacturer approved leveling compounds) are the responsibility of the general contractor or concrete subcontractor.
 
WSFI recommends the following procedures to be used by the general contractor or concrete subcontractor to provide the appropriate slab flatness requirement:
  1. Plot a 5' grid on the slab surface.
  1. Using a 10' straight edge, move it perpendicular to the plotted grid in both directions to identify all areas requiring correction. (Note: The use of a transit or laser alone does not include measurements between the grid points.)
  1. All high spots should be ground level. Fill low areas with appropriate manufacturer approved leveling compound. The fill must not become brittle, crack or lose bonding to the concrete slab. This is the responsibility of the general contractor or concrete subcontractor.
 
Note: Please request additional WSFI guidelines if Ff/Fl numbers have been specified.
 
For more information, please contact WSFI’s Technical Director at 888-480-9138 or email wsfi@maplefloor.org.
Disclaimer: The MFMA provides general information to architects, specifiers and consumers. The MFMA, its members, officers and agents disclaim any responsibility whatsoever for the accuracy or applicability of these guidelines under all circumstances and conditions.
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