Superflat Floor Classification / Measurement
It is recommended that both flatness and levelness requirements be described by FACE Floor Profile Number. Two separate F-numbers are required to define the required flatness and levelness of the constructed floor surface.

The Flatness F-number (FF) controls local surface bumpiness by limiting the magnitude of successive 1-ft (300mm) slope changes when measured along sample measurement lines.

The Levelness F-number (FL) controls local conformance to design grade by limiting differences in departures from design grade over distances of 10 ft (3m) when measured along sample measurement lines.

Flat Floor Classification
Floor Profile Quality
MHE Lift Height
Specified F-Numbers
FF Value FL Value
(Flatness) (Levelness)
Approx.Tolerance in
3 meter(*)
≥150 ≥100
Superflat Over 13 M
≥100 ≥60
Very Flat (Category 1) 8 - 13 M
≥50 ≥35
Flat (Category 2) 6 - 8 M
≥35 ≥25
Conventional (Category 3) Below 6 M
≥25 ≥18
(*) Note: Figure for cross reference only
Flat Floor Measurement
Measurement of flat floors shall be done using a purpose built floor flatness / levelness measuring instrument, the “DIPSTICK Floor Profiler”.

The finished floor surface profile is to be measured in accordance with ASTM E1155 “Standard Test Method for Determining Floor Flatness and Floor Levelness” using Face Floor Profile Numbers (F-number System).

The Dipstick Floor Profiler measures the floor profile and outputs the flatness F-number (FF) and the levelness F-number (FL) automatically in a computer generated report.

Click Here to View the Dipstick Floor Profiler
Click Here to View the Dipstick Report
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