01.09.2022
As of September 1, 2022, 25 state building codes came into effect, of which 11 are amendments to existing building codes and 14 are new DBN standards.
Among them is DBN V.2.6-31:2021 “Thermal Insulation and Energy Efficiency of Buildings”, the provisions of which raise the minimum permissible value of the reduced thermal resistance for external wall enclosure structures to Rq min=4.00 m2·K/W for Temperature Zone I and Rq min=3.50 for Temperature Zone II.
In practice, this means that single-layer external walls made of autoclaved aerated concrete must be 375 mm wide for D300 density blocks, 500 mm for D400 density blocks, and 550 mm for D500 blocks, in order to meet the standard reduced thermal resistance for Temperature Zone I.
At the same time, according to clause 5.6 of DBN V.2.6-31:2021, for new construction it is permitted to reduce the reduced thermal resistance to 80% of Rq min, provided that other energy efficiency indicators of the building are met (primarily the building’s specific energy consumption for heating and cooling). As calculations and practical experience with aerated concrete blocks in energy-efficient construction show, achieving a reduced thermal resistance of external walls at 80% of the new standard value (i.e., 80%×4.00=3.2 m2·K/W) is quite realistic. This level of thermal resistance (3.2 m2·K/W) is provided by external walls made of autoclaved aerated concrete blocks with a density of D300 at a width of 300 mm, D400 at 400 mm, and D500 at 500 mm.
Also effective from September 1, 2022 are the provisions of Amendment No. 1 to DBN V.2.6-162:2010 “Structures of Buildings and Structures. Masonry and Reinforced Masonry Structures. General Provisions” (Order of the Ministry of Regional Development No. 367 dated December 30, 2021), which stipulate, among other things, a minimum frost resistance grade of F50 for autoclaved aerated concrete blocks in accordance with the DSTU EN 15304 test methodology.
