Answer Posted / senthil

Rolling Margin is the deviation of actual unit weight to
that of Standard unit weight as per IS Standards.

Rolling Margin is calculated as :

Sectional weight = Weight of Steel Bars dia wise / length
of the bars.

As per IS Standards unit weight of the Bars is calculated
as dia x dia / 162

Rolling Margin is deviation of actual sectional weight to
that of IS Standard unit weight.

Standard Rolling Margin for different dia reinforcement
bars used for construction purposes:

8mm to 10mm +- 7%

12mm to 16mm +- 5%

20mm & Above +- 3%

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