Saving the Architectural Appearance of the Historical Buildings due to Heat Insulation of their External Walls

AbstractThe energy-efficient modernization of the historical buildings involves usually the warmth-insulation of their external walls. However the external mounting of the isolation materials leads to the loss of historical appearance of the buildings. The design of the construction of the inner warmth isolation for the external walls is of great importance to ensure keeping the optical appearance of the particular buildings and historical authenticity of the dwelling atmosphere in general.The paper contains the recommendations for the selection of construction of the inner isolation of the external walls in the historical buildings for Saint-Petersburg. The conditions of internal insulation assigned for exterior walls of historical buildings in Saint-Petersburg have been analyzed. The required thickness of an insulation material based on extrusion-type polystyrene foam panels has been determined, and humidity regime of insulated and non-insulated exterior walls has been considered