Flatness requirements affect finishing methods and cost.
In this article
F-numbers
FF and FL.
Specification
Read before pricing.
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Testing
Soon after placement.
Finishing
Methods matter.
Flooring needs
Thin flooring shows defects.
A closer look
Warehouses with high racking and buildings with thin flooring need flatter slabs. If the specification is missed in pricing, finishing crews and equipment may not match the requirement, leading to costly grinding or leveling.
Where to start
Highlight flatness requirements in your concrete scope and discuss methods with the finisher.
An example
A contractor tested slab flatness right after placement and corrected finishing methods for the next pour.
Common mistakes
Ignoring the spec, testing late and wrong finishing methods.
What to track
Track test results, corrective work and cost.
Questions to ask
What F-numbers does the specification require? Does the finisher have experience at that level? When will testing happen? What flooring or racking will sit on the slab?
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Frequently asked questions
What are F-numbers?
FF and FL are measures of floor flatness and levelness used in specifications. Higher numbers mean flatter and more level floors.