F numbers provide architects and contractors a method of determining the flatness and levelness of a concrete floor slab.
Dipstick floor flatness.
Some of the industry misconceptions for floor flatness and levelness are the following.
The astm that directs how the ff and fl values are to be collected and calculated is astm e1155 standard test method for determining ff floor flatness and fl floor levelness numbers ref.
The instrument is used in 66 countries on six continents to measure the flatness and levelness of concrete floor slabs and pavements.
Dipstick readings are guaranteed to be accurate to 0 0125 mm less than 0 0005 that s 5 10.
Testing labs building owners developers contractors universities research institutions and government agencies on six continents choose the dipstick because it produces the most accurate and repeatable flatness levelness data period.
It s been 45 years since the face companies started developing what became modern concrete floor flatness levelness technology.