Frozen & Burst Pipe Cleanup: water extraction and deep structural drying of flooded basements, crawlspaces and drywall caused by ruptured plumbing lines.
A frozen pipe is a plumbing problem. A burst pipe is a water damage problem, and it usually shows up at the worst moment: when the house warms up, the ice melts and a split in the copper lets go. This page covers how that happens in Cumberland County winters, what to do in the first minutes and what we do after you call.
What a burst-pipe cleanup includes, from the first pump to the paperwork
How fast pipes freeze when a cold snap sits on Cumberland County
The commonly quoted rule, from American Red Cross guidance, is that pipes can freeze and burst once outdoor temperatures reach 20 degrees or lower. Estimates for how long that takes vary. Some sources say as little as three hours for an unprotected pipe, others say about six hours for an insulated one. The honest answer is that it depends on wind, insulation and whether any warm air reaches the pipe. A pipe inside a heated wall can stay above freezing when it is 25 outside. A pipe against bare sheathing on a windy night may not.
Here is what the local record looks like. We pulled daily low temperatures for the Middletown-Harrisburg weather station from 1991 through 2020, the most recent 30-year period NOAA uses for its climate normals.
| Measure (1991-2020, Middletown-Harrisburg) | Value |
|---|---|
| Average January overnight low | 23.0°F |
| Nights per January with a low at or below 32°F | 25.6 of 31 |
| Nights per year at or below 20°F | 28.2 |
| Nights per year at or below 10°F | 5.3 |
| Median last spring freeze | April 9 |
| Median first fall freeze | November 4 |
| Coldest reading in the period | -22°F on January 21, 1994 |
That is about 28 nights a year at the 20-degree line, spread across roughly November to March. It is not one bad week. It is a long season, and the freeze that matters is the one that catches a pipe nobody thought about. Averages and freeze dates here are our own calculation from NOAA daily records, so treat the dates as typical, not guaranteed.
Which pipes fail first: exterior walls, crawlspaces, garages and hose bibs
Pipes do not freeze at random. They freeze where the heat does not reach.
Four places in a house where pipes freeze first
House cutaway showing four freeze-prone locations: pipes in exterior walls, pipes in an unheated crawlspace or basement, supply lines in an unheated garage, and the hose bib on the outside wall.
Illustration of common freeze points. A pipe in a heated interior wall is much less likely to freeze.
- Exterior walls. A supply line to a kitchen sink or bathroom on an outside wall sits against cold sheathing with little or no insulation behind it.
- Crawlspaces and unfinished basements. Pipes near foundation vents and the rim joist take the worst of it.
- Unheated garages. Laundry hookups and utility sink lines run through spaces nobody heats.
- Hose bibs. A hose left attached, or a faucet with no shut-off inside, traps water right at the cold wall.
In Mechanicsburg, about a third of the borough's homes were built before 1940 and about 63 percent before 1970, based on Census survey estimates. Older houses often have plumbing added or rerouted over the years, sometimes along an outside wall that was never meant to carry a water line. That is where we find a lot of the splits.
What happens when the pipe thaws and splits
The usual explanation is pressure. Ice blocks the pipe, and water trapped between the ice and a closed faucet has nowhere to go, so the pipe wall gives way. The split often opens in a place that looks fine until the ice melts. Then the line is open to full house pressure.
A figure often quoted from the Institute for Business and Home Safety is that a crack only one-eighth of an inch wide can release more than 250 gallons a day. Higher estimates exist for high-pressure lines, so treat 250 as a floor for planning, not a ceiling. Either way, that is why a burst pipe in an empty house, or one that lets go while you are at work, can flood a basement.
What to do right now: valve, power and photos
- Shut off the water. Close the main shut-off valve, usually where the line enters the house near the meter or the water heater. Then open a low faucet to drain the lines.
- Think about electricity first. If water is near outlets, appliances or the panel, do not wade in. Shut off power at the breaker only if you can reach it dry. Otherwise call us and an electrician.
- Take photos and video before anything moves. Wide shots, then close-ups of the split pipe, the wet walls, the floor and damaged belongings.
- Move what you can lift. Furniture legs off wet carpet, boxes off the floor, rugs outside to dry.
- Do not use a torch or open flame. If a pipe is only frozen, a hair dryer on low is safer. If it has already split, leave it for the plumber.
- Call us, then your insurer. The sooner drying starts, the less comes out of the house.
Water still spreading? Do not wait for it to stop on its own.
Call (223) 245-0005Hidden moisture in drywall and subfloor after the water stops
Once the pipe is off, the visible puddle is the easy part. Water that ran down inside a wall soaks the bottom of the drywall, wicks upward, wets insulation and settles on the bottom plate. Water that hit a finished floor can slide under the boards and soak the subfloor. None of that shows on the surface for days.
We map it with a moisture meter and a thermal camera, then mark the wet boundary on the wall. Standing water comes out with extractors. Soaked carpet pad and drywall that has wicked up past a few inches usually come out too. Framing and subfloor stay and get dried with air movers and dehumidifiers, set up following the IICRC S500 water damage standard.
The clock matters. CDC, EPA and FEMA guidance for flooded homes is to dry everything within 24 to 48 hours if you can, and to assume mold growth if you cannot. That is the reason for the fast response. Our structural drying page explains the equipment, and mold removal covers what happens if drying started too late.
Insurance documentation for a burst pipe claim
In Pennsylvania, standard homeowners policies generally cover damage from a sudden and accidental discharge of water, such as a burst pipe, and generally do not cover flood or sewer backup unless you have added coverage. Many policies also expect you to take reasonable steps to prevent further damage, like shutting the water off. Your policy wording decides, and your insurer decides coverage. What we can do is give them a clean record.
- Photos and video from before cleanup began, with the date
- The failed section of pipe, kept if the plumber can save it
- Daily moisture readings and a map of the wet areas
- A written scope of work and a list of what was removed
- Receipts for plumbing, drying and any temporary housing
For more on how coverage usually works, see the blog post on whether homeowners insurance covers water damage in Pennsylvania.
Preventing the next one before next winter
- Disconnect hoses and shut off outdoor faucets from the inside before the first freeze, usually by early November in this area.
- Insulate pipes in crawlspaces, garages and along exterior walls, and seal gaps where cold air enters.
- Open the cabinet doors under sinks on exterior walls on the coldest nights.
- Let a faucet drip when the forecast is near or below 20 degrees, and keep the heat on if you leave town.
- Know where your main shut-off is, and make sure everyone in the house does too.
Use our frozen pipe risk checker for a quick read on your own house, and the winter pipe checklist for the full list. Related service pages: basement flooding cleanup, crawlspace water damage and water damage restoration. We work in Shiremanstown, Camp Hill and Carlisle too.
Frozen pipe questions we get every January
At what temperature do pipes in Mechanicsburg start to freeze?
Guidance based on American Red Cross material puts the risk at 20 degrees or lower outside. Wind, insulation and pipe location matter more than the number. In the Middletown-Harrisburg record, the low reached 20 or below on about 28 nights a year between 1991 and 2020.
Should I turn the heat up or just call you?
Do both, but shut off the water first. If the pipe has already split, heat does not stop the flooding. If it is only frozen, keep the house warm and open the cabinet doors, and call a plumber.
Does homeowners insurance cover a burst pipe?
Standard Pennsylvania policies generally cover sudden and accidental water discharge, but coverage depends on the exact policy and on steps you took to prevent damage. Call your insurer and ask. We will provide photos, readings and a written scope.
How long does drying take after a burst pipe?
Most structural drying runs three to five days. Hardwood, plaster and thick framing can take longer. We take readings each visit and stop when the materials reach dry standard.
Can I wait until morning if the leak is small?
Shut the water off now and call. A small split still wets drywall and insulation, and the 24 to 48 hour drying window does not pause overnight.
