First, Scaffolding Calculation Rules
(1) When calculating the area occupied by internal and external wall scaffolding, doors and windows, and open spaces, no deductions may be made.
(2) If the height of a building varies, the different heights should be calculated accordingly.
(3) If the scope of work contracted by the general contractor does not include exterior wall decoration or if exterior wall decoration cannot be constructed using the main scaffolding, the cost of the main scaffolding or decorative scaffolding may be applied separately.
Second, Details Regarding External Scaffolding
(1) The height of the building’s exterior wall scaffolding is calculated from the designed outdoor ground to the eaves (or parapet top); the length of the exterior wall edge (for buttresses protruding from the wall with a width greater than 240mm, etc., is calculated according to the dimensions shown in the diagram and included in the exterior wall length) is multiplied by the height per square meter. (2) Buildings under 15m in height are calculated as single-row scaffolding. Buildings above 15m or below 15m, but with exterior doors, windows, and decorative areas exceeding 60% of the exterior wall surface area (or with cast-in-place concrete or lightweight block walls), are calculated as double-row scaffolding. Buildings exceeding 30m in height may be calculated as double-row scaffolding on a steel cantilever platform, depending on the project’s specific circumstances.
(3) Independent columns (cast-in-place concrete frame columns) are calculated as the outer perimeter of the column structure plus 3.6m, multiplied by the designed column height, per square meter, using a single dedicated scaffolding project. Cast-in-place concrete beams and walls are calculated as the height between the designed exterior floor slab or the upper surface of the floor slab and the bottom of the floor slab, multiplied by the net length of the beam or wall per square meter, using a double-row exterior scaffolding project.
(4) Steel pipe racks outside steel platforms are calculated as the outer edge length of the exterior wall multiplied by the designed height, per square meter. The platform’s leg width quota has been comprehensively determined and will be separately applied based on the height of the quota item.
Third, Details of Practical Scaffolding Operations
(1) Scaffolding for interior walls, from the designed interior floor to the lower surface of the roof (or half the gable height) is calculated as a single row of scaffolding if the height is less than 3.6m (non-lightweight blockwork walls); it is calculated as a double row of scaffolding if the height is greater than 3.6m but less than 6m.
(2) Calculation of interior scaffolding is based on the vertical projection area of the wall surface and is applicable to interior scaffolding projects. Lightweight blockwork walls that do not allow for scaffolding holes can be used in double row scaffolding projects.
Fourth, Details of Interior Scaffolding
(1) When the existing masonry scaffolding cannot be used for interior wall decoration exceeding 3.6m in height, decorative scaffolding may be calculated according to scaffolding calculation rules. The decorative scaffolding is calculated as a double row of scaffolding multiplied by a factor of 0.3.
(2) When the decorative surface of an interior ceiling is greater than 3.6m from the designed interior floor, it may be calculated as a full-floor scaffolding. Full-floor scaffolding is calculated based on the net interior area. When its height is between 3.61 and 5.2 meters, it is calculated as the foundation layer. When the height exceeds 5.2 meters, each additional 1.2 meters is counted as one layer, and any additional 0.6 meters is ignored. Additional layers are calculated using the following formula: Full-floor scaffolding layers = [Indoor net height - 5.2 meters] / 1.2 meters.
(3) When exterior wall decoration cannot be constructed using the main scaffolding, exterior wall decoration scaffolding may be calculated. Exterior wall decoration scaffolding is calculated based on the designed exterior wall decoration area, and the corresponding quota items are applied. Exterior wall painting and painting work are not included in the calculation of exterior wall decoration scaffolding.
(4) After the full-floor scaffolding is calculated according to regulations, scaffolding for interior wall decoration projects is no longer calculated.
Fifth. Other Scaffolding
(1) Fence scaffolding is calculated in square meters by multiplying the masonry height from the outdoor natural ground to the top of the fence by the length. Fence walls use single-row scaffolding for the corresponding project.
(2) For masonry walls, when the masonry height is greater than 1.0 mm, the design masonry height multiplied by the length is used to calculate the area in square meters, and double-row scaffolding should be used.
(3) For horizontal protective scaffolding, the actual horizontal projection area of the slab is calculated in square meters.
(4) For vertical protective scaffolding, the actual height between the natural floor and the top railing is multiplied by the actual length of the scaffolding.
(5) For cantilever scaffolding, the length is calculated based on the length and number of floors.
(6) For suspended scaffolding, the horizontal projection area of the scaffolding is calculated in square meters.
(7) For chimney scaffolding, the difference in height is calculated based on the number of seats. Concrete chimneys and silos constructed with sliding formwork are not scaffolding.
(8) For elevator shaft scaffolding, the calculation is based on a single span.
(9) Ramps vary in height for easier location calculation. (10) For masonry warehouse scaffolding, whether single-tube or grouped, the perimeter of the single-tube outer edge is used as the basis, multiplied by the height between the designed outdoor ground and the warehouse roof, and the calculation is in square meters. Double-row external scaffolding is applicable.
(11) For water (oil) tank scaffolding, the perimeter of the outer wall is multiplied by the height between the outdoor floor and the tank wall top, and the calculation is in square meters. When the height of the water (oil) tank exceeds 1.2m from the ground, double-row external scaffolding should be used.
(12) For equipment foundation scaffolding, the perimeter of the outer wall is multiplied by the height between the floor and the outer top edge, and the calculation is in square meters. Double-row scaffolding is applicable.
(13) The vertical closure of a building is calculated based on the vertical projection area of the closure surface.
(14) The vertically suspended safety net is calculated based on the actual length of the net portion multiplied by the actual height, and the calculation is in square meters.
(15) The cantilever safety net is calculated based on the selected horizontal projection area.
Post time: Jul-31-2025