After the erection of single layer scaffold, steel trusses can be installed on the scaffold. Each steel truss is 6m long. Two steel trusses will be connected together with M12 nuts and bolts to make the total length of 12m. This progress should be done on the ground. The 12m long truss will then be lifted up by using the mobile crane provided by the main contractor to the top of the single layer scaffolds. Both ends of the truss will then be fixed to the single layer scaffolds by using couplers. This progress should be done once at a time. The distance between two trusses should be around 750mm. Bracing will then be installed at the bottom of the truss.