Burst and frozen pipe repair in Knoxville, TN starts with closing the main shutoff, because a frozen line often splits and only leaks once it thaws. We thaw frozen sections with controlled heat, cut out the split pipe, replace it with new copper or PEX, and insulate or reroute the exposed run before leaving.
Updated October 2026
Why Pipes Split When They Freeze
Water expands as it freezes, and a plug of ice in a pipe traps the water between it and a closed faucet. Pressure builds in that trapped section until the pipe splits, often somewhere other than where the ice is. That's why a line can look fine while frozen and start spraying the moment it thaws.
The risky spots are predictable: exterior walls, crawlspaces open to the wind, garages and attics. After the repair, what matters is keeping that run warm next time. Winterizing the plumbing before the cold is the cheaper version of this page.
Signs a Pipe Has Frozen or Split
From Frozen Line to Protected Pipe
- 1
Shut off
Main closed and water stopped.
- 2
Find the damage
Frozen sections located, splits found as lines thaw.
- 3
Thaw safely
Controlled heat, faucet open, no flame.
- 4
Repair
Split section cut out, new pipe or fittings in.
- 5
Test and protect
Pressure checked, run insulated or rerouted.
Frozen Pipe Thawing
A faucet that gives a trickle or nothing on a cold morning usually has ice somewhere upstream. We find the frozen section by following the line from the last faucet that works, then thaw it with controlled heat: heat tape, a heat gun or warm air, never an open flame near framing. The faucet stays open so meltwater and pressure have somewhere to go. Once water flows, we check the thawed run under pressure, because a pipe that froze solid has often already split and hasn't leaked yet.
Split Copper Line
Copper splits along its length when it freezes, a thin crack that sprays once pressure returns. The damaged section is cut out back to round, undamaged pipe, and new copper is sweated or pressed in, or a PEX section with proper transition fittings where that suits the run better. A slip coupling alone on a long split moves the problem. Before restoring water, we check both sides of the repair for bulging, since a pipe that froze once has often swelled in more than one place.
Cracked PEX or CPVC Joint
PEX tubing tolerates freezing better than rigid pipe, but its fittings and the CPVC and brass around them do not. A freeze often cracks a CPVC fitting, pops a crimp ring or splits a plastic tee rather than the tubing itself. CPVC also turns brittle with age, and a cold snap finds that brittleness. We replace the failed fitting and a short section on each side, check the neighboring joints, and pressure-test the run. Old CPVC that keeps cracking is a sign the whole section is due for replacement.
Pipe Insulation After the Repair
Repairing a burst pipe without dealing with why it froze invites the same call next winter. After the repair, we insulate the exposed run with foam sleeves sized to the pipe, seal the draft that let cold air reach it, and for lines that can't be kept warm, add heat tape on a proper outlet or reroute the pipe into conditioned space. Garage and crawlspace lines get the most attention. That is the difference between a repair and a fix.
Knoxville Cold Snaps and the Pipes They Find
Frozen Pipes: What You Can Do Safely
Some thawing is safe to try yourself. The one rule is no open flame.
| Job | Reasonable DIY? | Why |
|---|---|---|
| Opening cabinets and raising the heat | Yes | Lets warm air reach pipes on exterior walls |
| Thawing with a hair dryer | Yes, carefully | Work from the open faucet back toward the ice |
| Using a torch or open flame | No | Fire risk in framing, and it can split the pipe |
| Repairing a split pipe | No | The damaged section has to be cut out and tested |
Pipe spraying after a thaw? Shut off the main and call now.
(865) 344-9122What a Burst Pipe Repair Costs Depends On
Most of the cost is reaching the pipe and how many places it split.
A crawlspace or basement line is quicker than one inside a finished wall.
A pipe that froze solid can split in more than one place.
Copper, PEX and CPVC use different fittings.
Insulation, heat tape or a reroute adds a little and saves the next call.
Nights and weekends cost more than scheduled work.
Burst & Frozen Pipe Repair Questions From Knoxville Homeowners
Should I turn off the water if a pipe is frozen?
If you suspect a split, yes; close the main so a thaw does not flood the house. Leave the faucet on the frozen line open.
Will a frozen pipe thaw on its own?
It can as temperatures rise, and that is when a hidden split starts leaking.
Does dripping faucets prevent freezing?
A slow drip on exterior-wall faucets helps by keeping water moving and relieving pressure.
Does insurance cover a burst pipe?
Sudden bursts are often covered for water damage; neglect may not be, and the pipe itself is sometimes excluded.
Why did it burst away from the ice?
Pressure builds between the ice and a closed faucet, and the pipe splits at the weakest point in that trapped section.
How do I stop it happening again?
Insulate exposed runs, seal crawlspace drafts and disconnect hoses; see outdoor faucet repair for hose bibs.
Other Emergency Jobs We Handle
Gas Leak Detection & Repair
Rotten egg smell and pressure test after repair.
Gas Leak Detection & Repair detailsWater Leak Detection
Hidden wall leak and meter running with fixtures off.
Water Leak Detection in KnoxvilleSump Pump Repair & Installation
Float switch failure and check valve replacement.
Sump Pump Repair & Installation in KnoxvilleNo water after a freeze?
Call any hour. We thaw it safely, fix the split and protect the run.