CSLB Concrete C-8 License 1 Practice Exam

Which is the most common method for measuring slab flatness and levelness on a project?

Use F-number ratings (FF/FL) and straightedges or profilometers as specified by project documents Visual inspection only Measure with a laser level alone Count the number of cracks

Correct Answer:

Use F-number ratings (FF/FL) and straightedges or profilometers as specified by project documents

Explanation:

Slab flatness and levelness are quantified using FF and FL ratings, which are measured with a profiling device or a long straightedge as defined by project documents. This method provides objective, repeatable numbers that reflect the actual surface geometry across the slab, and the project specs specify the target FF/FL values and how to measure them. Visual inspection alone can’t quantify how far a surface deviates from perfect flatness or levelness, and a laser level by itself typically doesn’t capture the full, continuous surface profile needed for FF/FL assessment. Counting cracks addresses cracking damage, not the surface geometry being measured.

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