Results of laboratory researches of the wall not reinforced products from cellular concrete of autoclave curing (gas-concrete blocks) are presented. The actual thermal insulation properties of the cellular concrete cut from product samples of three producers in most cases don't coincide with the values declared producers and presented in the standards prepared with their direct participation. The discrepancy of calculated and actual values of thermal conductivity of the materials and products used at the device of the external protecting designs leads to increase in heat losses through walls and to an over expenditure of specific heat consumption of heating system. In this regard cardinal revision of the values declared producers and also standards on the basis of which