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Thermal insulation of attic slabs is a conventional measure during the energy-efficiency improvement of residential buildings. A specific problem is warmth-insulation of attic slabs in historical buildings, which are the objects of cultural heritage, and for them the main modernization rule is the preservation of historical interiors (ceiling is a protection subject). The article exposes design of reconstruction of attic slabs while preserving the existing historical ceiling and warmth-insulation design is proposed

Energy-Efficient Features to Upgrade Attic Slabs of Historical Buildings (Case Study of Saint-Petersburg)