The F F value of a driveway, for example, might be 10 while the F F of a superflat floor could be as high as 125. The F F value is primarily a result of how good the finisher was at working the surface to achieve a flat floor. Take a grid of 2-foot intervals over the entire floor and put the values through an equation and you get the F F value as an indication of the waviness of the floor. F F is measured as the curvature of the floor over a 2-foot interval. F F-This number is used to indicate the flatness of a random-traffic floor.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.į-min is measured using a traveling profileograph, which simulates the wheel pattern of a high-mast lift truck.
The higher the F-number, the flatter or more level the floor. F-numbers were developed in the 1980s to provide a systematic, quantitative way to indicate the flatness and levelness of a concrete floor. One of the things that distinguishes a high tolerance floor is its F-number requirement.
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Can't you just see a poorly trained testing technician with an old warped 10-foot long 2x4 bending down with a ruler to measure the gap between the straightedge and the floor? Then saying, this floor is no good!īut, today we have F-numbers for flatness and levelness and ACI 302.1R, Guide for Concrete Floor and Slab Construction, that tells us when and how to apply the F number specifications. Anyone could measure almost any floor and pass it or fail it depending on how the measurement was applied and what they wanted to happen. The old flatness requirements of ¼ inch in 10 feet, for example, left so much up to interpretation that it was basically useless. In the bad old days, concrete floors were specified without knowing how to actually measure what was being specified. Many: The entity is found on a myriad of levels.Floor Flatness and Joints Understanding F-number requirements and jointing for commercial and industrial floors Updated February 12, 2021.Majority: The entity is found on over 50% of levels.Common: The entity is found on more than 20 levels.Uncommon: The entity is found on at least a dozen levels.Rare: The entity is found on less than 5 levels.Nearly Extinct: Very few of the entity remain and are mostly found on hidden levels.Extinct: The entity has been wiped out.Majority but mainly on level (#): The entity is found on a majority of levels but mainly its main habitat / level.Level (#): The entity is found only in its main habitat, a particular level.
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