For the ground without structural floor slab, it shall be the top surface of concrete cushion; “Peripheral protective structure” refers to the outer wall, including glass curtain wall, metal curtain wall, stone curtain wall, artificial panel curtain wall, etc.
The national standard GB55031-2022, General Code for Civil Buildings, which is mandatory in the full text, will be implemented from March 1! In case of any inconsistency between the relevant provisions of the current engineering construction standards and this specification, the provisions of this specification shall prevail.
6 plinth, wall-attached column, pier, step, wall plastering, decorative surface, inlaid block material surface layer, decorative curtain wall, outdoor air conditioning unit shelf (box), components and accessories outside the main structure, columnless canopy with a width of less than 2.10m and columnless canopy with a height of two floors or more.
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3.0.27: The following items shall not be calculated for the building area:……
See Figure 10 for external insulation of building exterior wall.
as the outer protective structure; “External surface” refers to the finished design surface of the external enclosure structure, which is generally composed of walls, thermal insulation layer and decorative layer, and the finished design surface is the outer edge line of the decorative surface layer; When the curtain wall is used as the outer envelope, the “outer surface” is the outer edge line of the curtain wall panel (see Figure 1).
This specification has a great impact on the building area.
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According to the new regulations, the exterior wall and curtain wall surface will be included in the building area from March 1! 1.
3.1.1 Article description: when “each natural floor” is a non-story building, the building area shall be the sum of the areas of each natural floor of the building; “Floor (ground) surface” refers to the designed finished surface of the floor (ground).
Adjustment of the new specification: the finished design surface of the exterior wall of the building (the finished design surface is the outer edge line of the decorative surface) is the calculation line of the building area.
The building area of thermal insulation layer is calculated based on the thickness of thermal insulation material, excluding the thickness of plastering layer, moisture-proof layer and protective layer (wall).
The old code GB/T50353-2013 Code for Calculation of Building Area of Building Engineering: 3.0.24 The external thermal insulation layer of the external wall of the building shall be calculated according to the horizontal sectional area of its thermal insulation material and included in the building area of the natural floor.
The new code GB55031-2022 General Code for Civil Buildings: 3.1.1 The building area shall be calculated according to the horizontal projected area of the space enclosed by the outer surface of the outer enclosure at each natural floor (ground) of the building.
3.0.24 Article description:…
