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Rotten OSB/plywood sheathing discovered after tear-off; Additional layers of old shingles requiring extra disposal.
| Description of Extra Work | Labor | Materials | Total |
|---|---|---|---|
| Replace 6 sheets of water-damaged 1/2-inch CDX plywood | Labor: $300 | Mat: $360 | Total: $660 |
| Install custom lead step flashing around brick chimney | Labor: $250 | Mat: $140 | Total: $390 |
Original Contract: $12500
This Change Order: +$1050
New Contract Total: $13550
Schedule Impact: +1 Working Days
Within minutes. When a roof is stripped down and exposed to weather, waiting hours for an email signature risks rain damage.
Include a unit price per sheet in your master contract, but still generate a formal Change Order specifying the exact number of sheets replaced.
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