The article presents the results of “in situ” tests of two new cement mortar floors that were made defectively in an important public building with a large area. The performed results of organoleptic tests and extensive strength tests, which are helpful in determining the causes of numerous and various defects in floors, were presented. It was observed that the source of the aforementioned causes is not only the failure to comply with the technological and technical conditions and requirements for laying a cement mortar mix and the execution of floors but also the lack of appropriate supervision over the entire flooring process. The causes of defects were determined and should help to avoid similar situations in the future.
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