the owner always wants to know what kind of a floor he got for his money. are the f-numbers that represent the flatness and levelness of the entire job. this is exactly what astm e-1155 calls for in paragraph 9.15 of the test method.
they are the face floor profile numbers developed by allen face from 1978 to 1987. they describe a concrete slab's flatness (ff) and levelness (fl). flatness this is kind of like figuring out a man's iq from his wonderlic test score. iq = (2 x