(20 15) According to Code for Calculation of Engineering Quantity of Building Construction and Decoration Engineering (GB50854-20 13), the height of block wall is correctly calculated as ().

Determination of wall height. 1) External wall: sloping (sloping) roof without cornice ceiling, counted as the bottom of roof panel; If there is a roof truss with suspended ceiling inside and outside, add 200mm to the bottom of the lower chord of the roof truss; if there is no suspended ceiling, add 300 mm to the bottom of the lower chord of the roof truss; when the cornice width exceeds 600mm, the actual build by laying bricks or stones height shall be calculated. If there is a reinforced concrete floor interlayer, it is counted as the top of the slab. Flat roof is calculated to the bottom of reinforced concrete slab. 2) Interior wall: if it is located in the lower chord of the roof truss, it is counted as the lower chord of the roof truss; If there is no roof truss, increase100 mm; To the bottom of the ceiling; There is a reinforced concrete floor interlayer, which is counted as the top surface of the floor; When there is a frame beam, it is counted as the bottom of the beam. 3) Parapet: calculated from the upper surface of roof panel to the top surface of parapet (if there is concrete coping, it is calculated to the lower surface of coping) 4) Internal and external gables: calculated according to their average height.