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The article presents the results of determining the sorption humidity of non-autoclaved foam concretes made on the basis of microsilica and autoclaved aerated concretes made with the use of fly ash. It was experimentally established that with an increase in the relative humidity of the air from 57 % to 77 %, the sorption humidity of non- autoclaved foam concretes with an average density of 400 kg/m3, 600 kg/m3 and 800 kg/m3 increases by 17.7 %, 17.1 % and 62.5 %, respectively. For autoclaved aerated concretes, the increase was: at an average density of 500 kg/m3 – 67.6 %, at an average density of 600 kg/m3 - 68.1 %. With a further increase in the relative humidity of the air to 97 %, the sorption humidity of non-autoclaved foam concretes with an average density of 400 kg/m3, 600 kg/m3 and 800 kg/m3 increases by 2.7, 3.3 and 3.5 times, respectively. In autoclaved aerated concretes, the sorption humidity increased significantly: at an average density of 500 kg/m3 – by 6 times, at an average density of 600 kg/m3 – by 5.5 times. After three months of testing, the sorption humidity of non-autoclaved foam concrete with an average density 600 kg/m3 exceeded the sorption humidity of autoclaved aerated concrete of the same density by 2.6 times at a relative humidity of the air 57 %, by 1.8 times at a relative humidity of the air 77 % and by 1.6 times at a relative humidity of the air 97 %. [ABSTRACT FROM AUTHOR]