Re-work confirmation requirements and claim procedure deadlines for material scrap from changes/employer-risk events: notice of intent within 28 days, claim report, employer reply in 14/28 days, and deemed waiver/acceptance on default (GB/T 50500-2024, 7.6.1/8.11.3/8.11.5)

Topic Positioning

Procedure nodes, deadlines, and default consequences for contractor claims when changes or employer-risk events (e.g., suspension) cause re-work, material scrap, and idle costs — the "how to run the procedure" question: re-work confirmation (7.6.1, the material-scrap-specific precondition), the claim document chain (8.11.3), and the employer's handling and reply duties (8.11.5). Claimable cost scope is in the companion cost card.

Core Conclusions

1. Re-work confirmation precondition for material scrap (7.6.1, verbatim) "Where a change or employer-risk event causes re-work of part or all of the completed works, or damage or scrapping of purchased or processed materials, the contractor shall demand re-work confirmation in writing within the contractual time and provide supporting documents. Failing which, the change or event shall be deemed not to have caused re-work or material damage/scrapping; the re-work shall not be measured and the costs shall not be compensated." "Re-work caused by change or employer risk shall be measured, and the employer shall compensate the contractor's losses and/or direct costs of performing the re-work." This is the material-scrap-specific precondition: omission = deemed no scrap, no compensation.

2. Claim procedure and deadlines (8.11.3)

1. The contractor shall submit a written claim notice of intent within the contractual period (28 days if silent) after the event, stating cause and intent; late notice is handled per contract.
2. Within the contractual period (28 days if silent) after the notice, submit a written claim report detailing cause, contractual basis, claimed cost and/or extension days, with necessary records, evidence, and cost computation sheets.
3. Claims involving both cost and time shall be raised together.
4. For continuing effects, submit continuation notices at contractual intervals (<= 28 days if silent) or reasonable intervals, describing ongoing effects with records and cumulative costs/days.
5. Within the contractual period (28 days if silent) after the continuing event ends, submit the final claim report covering the whole event with cumulative costs/days, records, evidence, and computation sheets. Default clause (end of 8.11.3): "Where the aggrieved party fails to claim within the agreed time, unless otherwise agreed by contract or provided by law, the claim may be deemed waived. Where the party receiving a claim report per contract fails to reply within the agreed time or at all, the claim may be deemed accepted."

3. Employer handling (8.11.5)

1. After receiving the notice of intent, review records/evidence within the prescribed time; where supplementation is needed, request further evidence in writing within the contractual period (14 days if silent).
2. Within the contractual period (28 days if silent) after receiving the report or supplements, reply in writing with the handling opinion; late or no reply may, absent contract terms, be deemed acceptance of the claim.
3. For claims involving both cost and time, approve together.
4. Once costs are agreed, pay them at the contractual ratio in current progress/process payments and the balance at completion settlement.

Applicable Boundaries

• The 28/14-day values are fallbacks "where the contract is silent"; contracts govern; "may be handled per contract" / "may be deemed" are not absolute forfeiture — loss of rights applies only absent other contract terms or legal provisions.
• Re-work confirmation and the claim notice are two independent acts, not interchangeable: confirmation targets change/employer-risk re-work and material scrap, within the contractual time — no fallback day count is set for it.
• The "continuation + final report" loop for continuing events cannot be skipped: without the final report, cumulative costs and days may not be assertable at once.
• Reports must attach cost computation sheets and evidence; all documents in writing with proof of service (deemed acceptance presumes valid delivery).

Further Reading

• GB/T 50500-2024: 7.6.1 (re-work confirmation), 8.11.3 (claim procedure), 8.11.5 (employer handling).
• See the comparison card for the evolution of default rules vs the 2013 edition's hard forfeiture; evidence-chain checking per the evidence card.
• Claimable costs, suspension losses, and appraisal calibers per the companion cost card (8.11.9/8.11.10; GB/T 51262-2017, 5.8.3).