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Cool_Car_Guys/Open/Models/Bonsai/references/Structural/FLOOR FLATNESS AND LEVELNESS.md
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2025-10-27 13:55:01 -05:00

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Floor Flatness and Levelness Specifications

Overall Flatness and Levelness (SOFF / SOFL)

  • The specified overall flatness (SOFF) and overall levelness (SOFL) values shall conform to the table below, based on the floor surface classification and slab category:
Classification SOFF SOFL Typical Applicability
A. Conventional 20 15 Nonpublic areas, mechanical rooms, slabs with thick-set tile or topping, parking structures
B. Moderately Flat 25 20 Carpeted areas
C. Flat 35 25 Industrial slabs, exposed slabs in public spaces, slabs to receive thin-set flooring
D. Very Flat 45 35 Ice or roller rinks, gymnasium floors scheduled to receive wood playing floors
E. Super Flat 60 40 Movie or television studios

Minimum Local Flatness and Levelness (MLFF / MLFL)

  • Minimum local flatness (MLFF) and levelness (MLFL) shall be 3/5 of the SOFF and SOFL values, unless noted otherwise.
    • For industrial slabs, MLFF = 23 and MLFL = 17.
  • The MLFF and MLFL values apply to the smallest areas defined by:
    1. Column lines and half-column lines, or
    2. Construction and contraction joints, whichever results in smaller areas.

Applicability of Tolerances

  • SOFL and MLFL tolerances apply only to:
    • Level slabs-on-ground, or
    • Level, uncambered suspended slabs that are shored to prevent deflection from placement until measurement.

Sloped Slabs

  • Slabs specified to slope shall have a tolerance of ±3/8" in 10 feet at any point from the specified slope.