Depreciation of main materials for each installment and dismantling is 5%. Total depreciation of main materials to the works does not exceed 70%.

Ms. Do Thi Mo (Hai Phong) uses the code AI.11912 for the processing of the working floor as a construction method.

During the construction period of 3 months, dismantling and erecting 8 times, she calculated the depreciation of main materials as follows: 3 x 1.5% + 8 x 5% = 44.5%.

However, the investor side calculates as: 3 x 1.5% + 7 x 5% = 39.5%.

Mrs. Mo asked, do you have to calculate dismantling and installment 7 times or 8 times?

The Ministry of Construction responded to this issue as follows:

Norms for processing the platform system, working platform are specified in code AI.11912 Circular No. 12/2021/TT-BXD dated August 31, 2021 of the Ministry of Construction on promulgating construction norms.

Accordingly, it is clearly defined for the case of using truss frame, scaffolding platform, working platform as construction methods, specifically the depreciation of main materials (section steel, steel plate, round steel) is allocated to the construction work. the corresponding period of use in a month is equal to 1.5%; depreciation of main materials for each erection and dismantling by 5%; the total depreciation of main materials to the works does not exceed 70%.