A floor with Ff = 48 and Fl = 16 is?

A floor with Ff = 48 and Fl = 16 is?

• A. Flat and Level
• B. Flat but Not Level
• C. Neither Flat nor Level
• D. Level but Not Flat

Answer: (B)

Floor Flatness (FF) and Floor Levelness (FL) are reported separately. FF tells you how close the surface is to a perfectly flat plane; higher values mean fewer deviations along the surface. FL tells you how close the surface is to true horizontal; higher values mean a flatter, more level floor. In this case, FF is 48, which places the surface in the flat range—good enough to be considered flat. FL is 16, which is well below the threshold for being level, so the floor is not level. Since the surface is flat but not level, the correct interpretation is that the floor is flat but not level.

Floor Flatness (FF) and Floor Levelness (FL) are reported separately. FF tells you how close the surface is to a perfectly flat plane; higher values mean fewer deviations along the surface. FL tells you how close the surface is to true horizontal; higher values mean a flatter, more level floor.

In this case, FF is 48, which places the surface in the flat range—good enough to be considered flat. FL is 16, which is well below the threshold for being level, so the floor is not level. Since the surface is flat but not level, the correct interpretation is that the floor is flat but not level.