Floor Flatness 30

The more bumps there are the lower the ff number will be and the more difficult it will be for a polished concrete floor to have a uniform appearance.

Floor flatness 30.

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. The ff floor flatness measurement reads the bumps highs and lows in the slab and higher numbers are better. However it is commonly known that concrete will continue to undergo change e g. The working range of the laser is up to 65 feet when being operated with the remote control.

When bidding a new construction project reading the 03 30 00 cast in. What does a specification for a floor flatness of 1 8 inch in 10 feet equal in f numbers. They describe a concrete slab s flatness ff and. The tool provides an accuracy of 1 8 inch at 30 feet and laser line visibility of 30 feet.

Concrete slab flatness slab flatness the degree of a slab s flatness is expressed by two numbers the ff and the fl together these are the f numbers they are the face floor profile numbers developed by allen face from 1978 to 1987. The scale is linear so that relative flatness levelness of two different floors will be in proportion to the ratio of their f numbers. The higher the f number the flatter or more level the floor. F numbers provide architects and contractors a method of determining the flatness and levelness of a concrete floor slab.

Concrete contractor pours the concrete and finishes it to the specified floor flatness requirement as stated in aci 117 specification for tolerances for concrete construction and materials the f f must be measured within 72 hours of the concrete pour. Floor flatness levelnessone of the things that distinguishes a high tolerance floor is its f number requirement. Since it was introduced in the 1970s f numbers have proven to be useful in measuring and improving concrete floor flatness and levelness. F numbers were developed in the 1980s to provide a systematic quantitative way to indicate the flatness and levelness of a concrete floor.

The gsl 2 provides high accuracy for detecting uneven spots by checking the floor surface in a radius of up to 65 feet in a matter of minutes. Concrete strengths rebar average rebar weights welded wire mesh pan slabs slab flatness and f numbers.