Ff Floor Flatness

Both numbers are dimensionless and the higher the number the more accurate the floor construction.

Ff floor flatness. Although there are no direct equivalents between f numbers and straightedge tolerances aci 302 construction of concrete floors and slabs gives the following table of approximate values. Improved flatness tolerances are not possible in elevated slabs without the use of double pan float machines which may pose a safety concern. They are calculated using the standards set forth in astm e1155 which is the standard test method for determining f f floor flatness and f l floor levelness numbers. Including floor flatness levelness faqs aci 117 sample specifications and other useful documents on astm f numbers ff fl fmin and the dipstick floor profiler and its software.

F l levelness is most affected by forming and strike off. Since it was introduced in the 1970s f numbers have proven to be useful in measuring and improving concrete floor flatness and levelness. Requirements for a class 300 floor very narrow aisle facilities with trucks for class 300 very narrow aisle must meet very strict leveling requirements. Floor flatness issues in high speed vna warehouses any very narrow aisle warehouse floor needs to be three to four times flatter than conventional concrete floors.

Csa a23 1 includes reference tables for specifying ff fl tolerances. What does a specification for a floor flatness of 1 8 inch in 10 feet equal in f numbers. With modern finishing equipment achieving overall floor. A single f number f min is therefore used to define the worst acceptable flatness and levelness conditions in a vna aisle and this f min value is assigned based on the expected lift truck and rack height as.

The following is a list of areas we recommend for consideration when designing a new floor. Therefore upon floor installation the flatness and levelness in the future lift truck wheel tracks need to be corrected in order to improve truck rideability. The ff fl and f min systems are completely different measuring systems and there is no corresponding index for comparison purposes. Ff and fl numbers floor flatness and levelness f numbers provide architects and contractors a method of determining the flatness and levelness of a concrete floor slab.

Ff flatness is most affected by the finishing operation. Since the 1970s the face companies have played a leading role in the development of the modern concrete floor.