The article statistically analyzes experimental tests on a light floor system (LFS) without screeds. The results of over two years
of experiments in which the strength of C2S1 and C2S2 cement deformable adhesive for tensile and shearing were tested allow
to determine the confidence interval for the expected value of these strengths along with determining the relative precision of
the estimation. In the article, only the C2S1 adhesive was analyzed because it meets two important criteria. It has relatively high
mechanical strength and is more economically advantageous (purchase price 2-3 times lower than C2S2). The obtained data also
allowed to verify the hypothesis regarding the minimum strength of the C2S1 adhesive during the pull-off test and shear strength.