IS 1200 measures structural steelwork and reinforcement by computed mass — from standard sectional weights (rolled sections) or the bar bending schedule (IS 2502) for reinforcement — not by length or lump sum. Authorised laps are measured; wastage/rolling margin and chairs/spacers are treated per the standard rule and contract, so the steel bill is computed, reproducible and auditable.
Key Requirements
•Structural steel measured by computed mass from standard sectional weights (rolled-section tables)
•Reinforcement measured by mass from the bar bending schedule (IS 2502) cutting lengths
•Authorised laps/splices measured; unauthorised wastage not paid
•Chairs/spacers and binding wire treated per the standard rule / contract preamble
•Mass computed (not weighed-as-delivered) — based on standard nominal weights
Practical Notes
✓Reinforcement is paid by BBS mass (IS 2502) — a wrong/unapproved BBS directly mis-bills the steel; the BBS is the measurement document.
✓Steel is measured by computed standard mass, not by weighbridge as-delivered (which includes wastage/over-delivery).
Common Mistakes
⚠Measuring reinforcement by length or weighbridge instead of computed BBS mass.
⚠Paying unauthorised wastage / over-delivery.
⚠No standard rule for chairs/spacers/binding wire in the preamble.