Knoxville does not freeze often, which is part of the problem. Many houses here were built with water lines running through crawl spaces, garages and outside walls, and those lines are fine for most of the winter. Then a hard freeze arrives and stays for a night or two. Water freezes inside an exposed pipe, pressure builds behind the ice, and the pipe splits. Often nobody knows until the thaw, when water starts moving through the crack at full line pressure.
Supply water is clean, which gives drying a head start. Subfloor, joists and drywall that got wet from a clean line can often be dried in place if drying starts within a day or two. The same water left for several days is treated as dirtier water, and more material usually has to come out.
Water category: Category 1 (clean water) when it is found and dried quickly
1Close the main shutoff. In a crawl-space house it is often near where the line comes through the foundation wall, or at the meter box near the street.
2Open a faucet on the bottom floor to let the pressure out of the lines.
3If water is reaching outlets or a ceiling is sagging, stay out of that room and turn its breaker off only from a dry spot.
4Take photos of the split pipe and every wet area for your records before anything is moved.
5Call for drying the same day the leak is found. The plumber fixes the pipe; drying is the part that can't wait.
What a burst & frozen pipes job should include
Use this as a checklist against the written scope the company gives you. If a step is missing, ask why.
Step 1
Find where the water went
Moisture meters and a thermal camera show how far water traveled under the floor and inside walls, which is usually farther than the stain.
Step 2
Remove standing water
Water is pulled out of carpet, pad, subfloor and the crawl space so drying equipment can work.
Step 3
Take out what can't be dried
Soaked insulation, swollen baseboard and wet crawl-space insulation usually come out. Drywall is often cut in a straight line above the wet area.
Step 4
Dry and measure daily
Dehumidifiers and air movers run with readings taken every day until each material is back to its normal dry level.
Step 5
Hand over the records
You get photos, daily moisture readings and a written list of what was done and why.
Knoxville facts for this problem
Knoxville's worst pipe nights come in short, sharp freezes. McGhee Tyson Airport recorded 4°F on December 23 and 24, 2022, and 0°F in January 2024. First Utility District reminds customers that turning water off at the meter does not by itself keep pipes from freezing; the lines still need to be drained.
Unprotected pipes start to freeze when the outdoor temperature drops to about 20°F, according to the Insurance Institute for Business & Home Safety as cited by the International Code Council.
In January 2024 Knoxville reached 0°F and kept 4 inches or more of snow on the ground for 7 straight days, the longest such stretch since depth records began in 1910.
Water that escapes suddenly from a plumbing line is the kind of loss a standard homeowners policy is written for. The pipe itself usually isn't covered, and freeze damage can be treated differently if a house was left unheated without the water shut off. Your policy wording decides it, so read the water and freezing sections before you make any decisions.
General information, not advice about your policy. Only your insurer decides coverage.
How cold does it have to get in Knoxville for pipes to freeze?
Pipes in an unheated space are at risk once the outdoor temperature drops to about 20°F, a figure the International Code Council attributes to the Insurance Institute for Business and Home Safety. Wind blowing into a crawl space can freeze a pipe at warmer temperatures. Our weather page flags any night in the forecast at or below 20°F at McGhee Tyson Airport.
Should I call a plumber or a drying company first?
Close the shutoff first, then call the two of them. The plumber repairs the pipe; the drying company removes the water and dries the structure. Don't wait for the repair before drying starts.
How do I keep pipes from freezing next time?
Close the crawl-space vents and fix torn vapor barrier before a cold snap, insulate pipes in the crawl space and garage, open sink cabinets on outside walls, let those faucets drip on nights at or below 20°F, and disconnect garden hoses. If you will be away in winter, shut off the main and drain the lines.
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