The following chart shows the maximum gap between the floor surface and the bottom of the 10’ (3m) straightedge. It is important to note that 90% of the samples must not exceed Column 2 …

This system identifies two numbers: FF (floor flatness) controls local surface bumpiness (or waviness) by limiting the magnitude of successive 300 mm (1-foot) slope changes. The other, …

“Flatness” relates to the bumpiness of the floor, while “levelness” describes the local tilt or pitch of the slab. The higher the F-Number, the better that characteristic of the floor. F-Numbers are …

To specify F-Numbers and ASTM E1155M were adopted by correctly, two values are required for the American Concrete Institute as flatness and levelness: the standard for specifying floor …

Appropriate floor flatness requirements for the slab, based on conditions, intended usage, and service requirements, can be found in ACI 302 section - Guide for Concrete Floor and Slab …

Fl, or "levelness F-Number," defines the relative conformity of the floor surface to a horizontal plane as measured over a 10' (3.03m) distance. The higher the F-Numbers, the more level or …

Jun 24, 2015 · Concrete Floor Slab Flatness and Levelness Traditionally allowable tolerances of concrete floor slabs were determined by checking the slab surface with a 10 foot straightedge. …

Dec 15, 2023 · For floors intended to receive thin-set flooring, such as vinyl or rubber sheet and tile floors, the Floor Flatness (Ff) should be 35 and the Floor Levelness (Fl) should be 20 for …

Floor Flatness, abbreviated FF, is a measure of how bumpy the floor’s finished surface may be, and thus the magnitude of slope changes. The Floor Levelness (FL) number is a measure of …

Levelness (FL Number): The FL Number measures the floor’s deviation from a true horizontal plane over longer distances, usually around 3m (10 feet). Higher FL numbers indicate a more …

evaluate the floor flatness and levelness, F F and FL; respectively. FF (flatness) is most affected by the finishing operation. F L (levelness) is most affected by forming and strike-off. Both …

Fl, or "levelness F-Number," defines the relative conformity of the floor surface to a horizontal plane as measured over a 10' (3.03 m) distance. The higher the F-numbers, the more level or …

Ff, or "flatness F-Number," defines the maximum floor curvature allowed over 24" (600 mm) computed on the basis of successive 12" (300 mm) elevation differentials. Fl, or "levelness F- …

Nov 14, 2017 · Braun Intertec has performed floor flatness/levelness tests on a variety of industrial and commercial buildings throughout Iowa, Kansas, Louisiana, Minnesota, North Dakota, …

The F-number system is the standard specification and measurement for concrete floors; for flatness and floor levelness. This system replaces the 1/8” per 10’ specification. Floor Flatness (F

Jul 1, 2010 · Under the revised standard, 1/8 inch in 10 feet is not a standard option. Learn what each term means and how to specify floor slab tolerances in accordance with industry …