The latest provisions of GB55,031-2022 General Code for Civil Buildings: 3.1.5 The building area of the balcony shall be calculated as 1/2 of the horizontal projected area of the space surrounding the exterior surface of the enclosure; When the balcony is closed, it shall be calculated according to the horizontal projected area of the space enclosed by the surface of its outer enclosure structure.
If the balcony is not closed, it is half.
3.1.6 Building area shall not be calculated for the following spaces and parts: 1.
Balcony area The balcony in the main structure in 3.0.21 of the current GBT50353-2013 Code for Calculation of Building Area of Building Engineering shall be calculated as the full area according to the horizontal area of the periphery of the structure; For the balcony outside the main structure, 1/2 area shall be calculated according to the horizontal projection area of the structural floor.
In case of any discrepancy between the relevant provisions of the current engineering construction standards and this specification, the provisions of this specification shall prevail.
Although this Code is short, each of them is a strong one and is a basic code that all civil buildings must comply with.
3.1.8 The usable area of the functional unit shall be calculated as the sum of the usable areas of each functional space in the functional unit.
▲ For more interpretation, pay attention to the “drawing specification”.
Interpretation of drawing specifications: ①.
3.1.7 The usable area of the functional space shall be calculated according to the horizontal projected area of the space enclosed by the interior surface of the functional space wall.
Building space with structural floor height or inclined structural slab top height less than 2.20m; 2.
What are the key changes compared with the current situation? The drawing specification carefully read through the new specification, and the focus is as follows: • Balcony area calculation: closed balcony is calculated as a whole, and open balcony is calculated as half; • The building area is not calculated when the height of the structural floor or the top height of the inclined structural slab is less than 2.2m; • The building area calculation of special-shaped buildings has a basis; • The cornice height can be calculated according to the height of the lowest point of the pitched roof; • The uncontrollable factors of the height of construction equipment such as microwave communication have been removed; • The clear distance from the edge of handrails set against the wall of stairs to the finished surface of the wall shall not be less than 40mm; • The railing height shall not be less than 1.10m; • The arcade cannot protrude the red line of the land 1.
The building area of buildings in 3.0.1 of the current Code for the Calculation of Building Area of Building Engineering shall be calculated as the sum of the peripheral horizontal areas of the natural floor exterior wall structure.
After the new regulation, the balcony area does not need to be determined by the structure.
The building area of the current balcony is determined and calculated according to the structure: for example, the concave balcony is the full area, and the convex balcony is the half area.
The latest provisions of GB55,031-2022 General Code for Civil Buildings: 3.1.1 The building area shall be calculated according to the horizontal projection area of the space enclosed by the outer surface of the outer enclosure at each natural floor (ground) of the building.
3.1.5 The building area of the balcony shall be calculated as 1/2 of the horizontal projection area of the space enclosed by the outer surface of the enclosure; When the balcony is closed, it shall be calculated according to the horizontal projected area of the space enclosed by the outer surface of its outer enclosure.
Building space without roof; 3 Components (fittings) attached to the building envelope; 4 The lower space of the overhanging part of the building; 5 The public transport space in the building used for urban street passage; 6 Various structures independent of buildings.
The current Unified Standard for Civil Buildings has no provisions on building area, and the main provisions are in accordance with the Code for Calculation of Building Area of Building Engineering GB/T50353-2013.
3.1.4 For the building space with permanent structure, if there is a permanent top cover, the height of the structure floor or the top height of the inclined structural plate is 2.20m or more, the building area shall be calculated according to the following provisions: 1 For the building space with enclosure structure and enclosed enclosure, the horizontal projected area of the space enclosed by the outer surface of its outer enclosure structure shall be calculated; 2 For the building space without enclosure structure, enclosed by columns, or partially enclosed by enclosure structure and columns, the horizontal projection area of the space enclosed by the outer surface of the column or outer enclosure structure shall be calculated; 3 The building space without enclosure structure, single row of columns or independent columns, and open space shall be calculated as 1/2 of the horizontal projected area of its top cover; 4 For the building space without enclosure, with enclosure facilities, without columns, attached to the outer enclosure structure of the building, and not enclosed, it shall be calculated as 1/2 of the horizontal projection area of the space enclosed by the outer surface of the enclosure facilities.
If the balcony is closed, it is full area.
According to “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”, the Code for Calculation of Building Area of Building Engineering GB/T50353-2013 is also within the scope of this specification.
Illustration specification interpretation: the calculation rules of the building area of the balcony have changed dramatically.
If the structural storey height is 2.20m or above, the total area shall be calculated; 1/2 area shall be calculated if the structural floor height is less than 2.20m.
This specification is a mandatory engineering construction specification, and all provisions must be strictly implemented.
3.1.3 The building area of the building space above the outdoor design floor shall be included in the above ground building area; The building area of the building space below the outdoor design floor shall be included in the underground building area.
It needs to be determined by the state of “balcony closed”.
Article 3.0.21 The building area of the balcony of a building, regardless of its form, shall be calculated respectively with the main structure of the building as the boundary.
It has nothing to do with the layout of the shear wall, and it is a strong specification, which must be implemented..
3.1.2 The total building area shall be calculated as the sum of the above ground and underground building areas, and the above ground and underground building areas shall be calculated separately.
3.1.9 The building area of the functional unit shall be calculated by the sum of the area used by the functional unit, the horizontal projected area of the functional unit wall, and the area of the balcony in the functional unit.
On August 25, 2022, the Ministry of Housing and Urban Rural Development approved the General Code for Civil Buildings as a national standard, numbered GB55031-2022, which will be implemented from March 1, 2023.
