The F-Number system was created in the 1970's to quantify the quality of concrete floor surfaces in terms of flatness (bumpiness) and levelness (tilt). F-Number tolerances are specified separately for each type of slab construction (eg: slab on grade, formed suspended slab, slab on metal deck).

The Canadian concrete standard CSA A23.1 includes a floor tolerance Table 22 which stipulates F-Number tolerances for a variety of concrete floor surfaces. In order to gain information on the application of the tolerance classifications listed in Table 22, the CSA A23.1 Technical Subcommittee 7 (placing, finishing & curing) welcomes the submission of anonymous F-Number data as well as any contractor or client comments for consideration.

Please complete the following information:

Project Type (eg: warehouse/school/retail/ice rink): Project City Location: Type of Slab (eg: slab on grade/formed suspended slab/slab on deck): Screeding Method (eg: wet screed, manual vibrating screed, copperhead, laser screed, pipe screed, truss screed): Finishing Method (eg: single trowel, pan float, highway straightedge, double trowel - input all that apply): "Specified" Overall FF Value: "Specified" Overall FL Value: "Actual" Overall FF Value (to nearest whole number): "Actual" Overall FL Value (to nearest whole number): Your name, phone or e-Mail address (optional): Additional comments relating to success, problems or client concerns:

        

Concrete Floor Contractors Association of Canada RPO DUNDAS NEYAGAWA, PO Box 30021, Oakville, ON, L6H 7L8 Tel: (905) 582-9825 Fax: (416) 981-3913