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3-4%, if more then you need to say what happens on site........
5% should be the max wastage ratio, it mainly depends on the spans and heights of your reinforced construction elements.
Usually5% of the total weight, But you should consider the dimension and total quantity which relates the wastage. then to put the persentage accordingly.
It varies from2%-4%
5% should be the max wastage ratio
Up to5%
not more than5%
In actual site work based on my experience, the wastage is around7%, itemized as follows:2% recyclable and could be sold,3% cut pieces are used as dowels or shimmings, and2% could be recorded as bad debt for they are lost in the construction process. These data were taken from5 projects costing more than3 million U.S. dollars each approximately.
Mr Francis is right....
Commonly accepted as 5%, many factors affecting this ratio. A detail analysis for one example of a 3-storey high office building producing a wastage ratio as high as 17%+. You won't believe until you face one, just a matter of chance by luck (if you lucky enough to get 5% wastage across all your building projects). Hopefully you won't be liked me fighting for reimbursement, went through several weeks of detail analysis figuring out where went wrong. You finally found high residue rebar, and cannot be re-used elsewhere, even those can be re-used, still resulting in wastage. Timing of bar bending also play a huge part, for example, large quantity of short rebar in the beginning, and those short residue rebars in the end have no place for. Adding in another dimensions of complication, needing to consider cash flow of the project. Good luck to all us engineers.
