This is because so many other components rely on it. On the other hand, flatness is critical on elevated slabs. Elevated slabs can take a little bit longer to measure because of deflection. This is because deflection that occurs cannot be completely controlled by a contractor. While both FF and FL numbers work on standard concrete floors, elevated slabs typically only specify the FF number. In order to serve its purpose, the concrete floor should be both flat and level. A common analogy is to describe F-numbers like a wave that has both amplitude and frequency. Because people often assume something flat must be level, it’s easy to see how they can become confused. These two numbers work together to control levelness and flatness. The more level your slab, the higher your number. Higher F-numbers equal flatter floors.įloor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab. Bumps and grooves cause your Floor Flatness numbers to drop. Because it is a complicated and tedious procedure, devices like the Dipstick Floor Profiler have been approved by the ASTM for F-number measurement.įloor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. F-numbers are created from several measurements and then run through a formula that calculates the number. Understanding F-numbers can be difficult because they aren’t a simple measurement, like the dimensions of a wooden structure. This is why the American Concrete Institute requires F-number measurements to be taken within 72 hours of slab installation. To pour concrete properly, you have to have a good understanding of what these numbers mean because they can improve the quality of your jobs. They consist of the concrete floor flatness (FF) and floor levelness (FL). When it comes to concrete slab construction, F-Numbers are the metric for quality. Understanding F-Numbers for Super Flat Floors
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