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typical values for floor flatness/levelness

typical values for floor flatness/levelness

typical values for floor flatness/levelness

(OP)
What values are reasonable for an office type floor, not a warehouse?  According to ACI Concrete Knowledge Center, Ff = 20 and Fl = 15 are "conventional numbers."  This would be equal to a 5/16" gap under a 10' straightedge, which seems excessive, but maybe that is typical.  I would like to hear what numbers you normally specify, and if they have been verified by a lab as actually achieved.  Thanks for your feedback.

RE: typical values for floor flatness/levelness

Ff=25 to 30, Fl=18 to 20 will get in a reasonable range, somewhat near or slightly better than 1/4 under 10-ft. straightedge.

When you exceed these numbers, it requires more control in the placement and finishing process, that might not be worth the extra effort/cost, particularly for general office use.

RE: typical values for floor flatness/levelness

The floor must be finished to some reasonable standard.  A deviation of 1/4" in ten feet has long been a specified standard, but in the last fifty years, I cannot recall anyone ever checking to see if the floor complies.  It is a good idea to have something in your spec just in case you get a really wild floor finish and the contractor wants to argue that it really is okay.

Best regards,

BA

RE: typical values for floor flatness/levelness

Depends what type of flooring you are putting down. If its carpetting- I would think the lower values would be just fine.

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