Assessment of the Technical Condition of Roofs of Large-Panel Residential Buildings Erected in Belarus before 1993

The paper provides an assessment of the technical condition of combined insulated rolled roofs with a sequential arrangement of layers and ventilated roofs of large-panel residential buildings of standard series built in Belarus before 1993. The results of field studies have shown that after more than 30 years of operation, the technical condition of the materials of the main structural layers (bearing structure of the coating, vapor barrier, materials of the thermal insulation layer) is operable. Defects that have a negative impact on the functional suitability of roofs as a whole are recorded only in the main  waterproofing carpet and cement-sand screed. It has been established that the causes of the appearance and development of operational defects (loss of coarse-grained sprinkling with roofing material, stagnation of water on the roof, cracks in the bitumen coating layer of the rolled roof, swelling between the layers of the rolled roofing carpet) are “harsh” operating conditions of roofs: constant, throughout the entire period of operation, influence on the materials of atmospheric influences, as well as violations of the technology of roofing work. To maintain the working condition of combined insulated rolled roofs of large-panel residential buildings operated for more than 30 years, the main material and financial costs fall on partial repair of the waterproofing carpet, including local repair of cement-sand screed. The reason for the local destruction of the roof screed of large-panel residential buildings built before 1993 is its insufficient frost resistance, due to the requirement laid down in the design of such buildings to ensure the strength of the screed material in terms of  frost resistance for the rated service life of large-panel residential buildings, i.e. for at least 30 years.  Considering that the standard service life of all large-panel residential buildings built before 1993 is more than 30 years, the problem of ensuring the operability of the screed will become increasingly relevant. It is proposed to extend the service life of the screed without repairs and reduce heat loss through the combined coating to install an inversion roof on the existing roof.

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