Residential Slab Flatness
Residential Slab Flatness
(OP)
What is the U.S. code requirement for slab flatness in in home construction and the code reference?
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RE: Residential Slab Flatness
RE: Residential Slab Flatness
regards
sc
RE: Residential Slab Flatness
RE: Residential Slab Flatness
RE: Residential Slab Flatness
RE: Residential Slab Flatness
Floor flatness is generally specified now by Ff (flatness) and FL (levelness) profiling criteria. ACI accepts this protocol and there are accepted standards for the testing. As an example, a specifier might state a flatness requirement of Ff=25 and levelness of FL=15. Some would consider this to be close to the 1/4" in 10 feet requirement, but there is no true correlation.
Keep in mind (noting NickDemos's statement) that flatness and levelness are different. A sloped floor can have a flat profile. Flatness refers to the floor surface profile, not the state of the levelness of the floor.
RE: Residential Slab Flatness
"The F-Number System is the new American Concrete Institute (# 117) and Canadian Standards Association (# A23.1) standard for the specification and measurement of concrete floor flatness and levelness. F-Numbers replace the familiar "1/8th inch in ten feet" type specs that had proven unreliable, unmeasureable and unrealistic.
The new standards include two F-Numbers:
FF for flatness and FL for levelness
Flatness relates to the bumpiness of the floor, while levelness describes the tilt or pitch of the slab. The higher the F-Number, the better that characteristic of the floor. "
from: http://faceco.com/40q.html