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1 lis 1992 · FF is an indicator of floor flatness or smoothness. FL indicates floor levelness. The higher these numbers, the flatter or more level the floor. An FF 20 isn't a particularly flat floor, but the floor probably won't be flat enough if you use bull floats for finishing.
There are actually three F-numbers that are used for concrete floors, depending on whether the floor will have a random traffic pattern or defined traffic aisles. Flatness is determined by finishing while levelness is determined by strike-off.
The higher the F-Numbers, the more level or flat the slab. For reference, the Maple Flooring Manufacturers Association (MFMA) requires that the general contractor provide a concrete slab, troweled smooth and flat to a tolerance of 1/8" in a 10' radius for all gymnasium floors.
28 lis 2016 · Floor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. Bumps and grooves cause your Floor Flatness numbers to drop. Higher F-numbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab.
The F-Number System from the American Concrete Institute (ACI) is now the standard for measuring floor flatness and levelness of concrete slabs. Floor Flatness, abbreviated FF, is a measure of how bumpy the floor’s finished surface may be, and thus the magnitude of slope changes.
A comprehensive comparison table of Free Movement Specifications TR34 (4th edition), ASTM E 1155 – F Numbers, and DIN 18202.
6 sie 2015 · Flatter and more level concrete floors are made possible with the F-number system. F-numbers were first used in 1983 on a commercial project, and we continue to use them today in order to achieve floor flatness and levelness. The degree of flatness and levelness is expressed using two numbers: FF (flatness) and FL (levelness).
