Document ground conditions, rebar upgrades, and additional cubic yardage before the concrete truck arrives.
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Poor soil bearing capacity requiring extra gravel base; Thickness increase from 4-inch to 6-inch slab with #4 rebar.
| Description of Extra Work | Labor | Materials | Total |
|---|---|---|---|
| Excavate 8 inches of unsuitable clay soil and backfill | Labor: $550 | Mat: $480 | Total: $1030 |
| Add 4 yards of 4000 PSI concrete mix with fiber mesh | Labor: $300 | Mat: $680 | Total: $980 |
Original Contract: $16000
This Change Order: +$2010
New Contract Total: $18010
Schedule Impact: +2 Working Days
Concrete cures fast. You cannot undo a pour. If extra yardage isn't signed off before the truck leaves, you are eating the cost.
Use a standby change order detailing the hourly rate for the crew and equipment sitting idle.
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