Freezing, and why the damage shows up late
Freeze splits are the seasonal staple in Spartanburg, and crawlspace runs are where they happen. A pipe in a vented crawlspace sits in outside air on a cold night with nothing above it but floorboards.
The part that catches people out is the timing. While the pipe is frozen, the ice plug seals the split it caused, so nothing leaks. The water arrives when it thaws, usually the following afternoon or when the heating goes up. The mess appears after the cold has passed, and people reasonably assume the risk passed with it.
Spartanburg Water advises letting faucets drip ahead of winter weather, because moving water is much harder to freeze than still water, and the utility has said publicly that it does expect some pipes to burst and some water lines to break during freeze events. The National Weather Service office in Greenville-Spartanburg issues the freeze warnings that cover upstate South Carolina, and those are the nights this work comes from. See frozen burst pipe repair.
