Every January the same calls come in across Indianapolis: no water at the kitchen sink on a Monday morning, then a wet ceiling on Wednesday when the pipe thaws and the split opens up. Frozen pipes are the most expensive routine plumbing emergency in this city, and almost all of them are preventable with an hour of work before the first hard freeze. This guide covers where Indianapolis pipes actually freeze, what to do about each spot, how to handle a pipe that’s already frozen, and when it’s time to call.
Why Indianapolis pipes freeze
Water expands about 9 percent when it freezes. In a closed pipe that expansion has nowhere to go, so pressure builds between the ice plug and the nearest closed faucet until the pipe splits, usually at a joint or a weak spot, and often somewhere other than where the ice is. The split doesn’t leak while it’s frozen. It leaks when it thaws, which is why the damage shows up a day or two after the cold snap.
Indianapolis gets a dozen or more nights below 20°F in a typical winter and a few below zero, with the worst stretches in January and early February. A single night in the teens with wind is enough to freeze an exposed pipe. Pipes in heated interior walls almost never freeze; the problem is every pipe that isn’t in one.
Where pipes freeze in Indianapolis homes
Crawlspaces. Thousands of Indianapolis homes, especially on the south and east sides, sit over crawlspaces with open or broken vents and no insulation on the pipes. This is the number one freeze location we see.
Garages. A water heater, laundry hookup or utility sink in an unheated attached garage, or a supply line running through the garage ceiling to a bonus room above it. Bonus rooms over garages in Fishers, Carmel and Avon subdivisions are a specific repeat offender: the floor is cold, and so is the pipe in it.
Exterior walls. Kitchen sinks on an outside wall, especially in older homes in Irvington, Broad Ripple and Meridian-Kessler where the wall cavity has little or no insulation. The cabinet doors stay closed, the warm air never reaches the pipe.
Hose bibs. An outdoor faucet with a hose still attached, or a non-frost-free bib that wasn’t shut off and drained inside, freezes and splits the pipe just inside the wall. You won’t know until spring when you turn it on and water pours into the basement.
Unheated additions, porches and mudrooms. Rooms added later often have plumbing run through spaces that aren’t on the furnace.
Attics. Less common in Indianapolis than in the South, but some homes run supply lines through the attic to a second-floor bath.
Vacant homes and second homes. A furnace set to 50°F with a power outage, or a thermostat failure while nobody is home.
What to do before the first hard freeze
1. Disconnect hoses and shut off hose bibs
Unscrew every garden hose. If your outdoor faucets have an interior shutoff valve (look for a valve on the pipe leading to each bib, usually in the basement or crawlspace), close it, then open the outdoor faucet to drain the line and leave it open. If your bibs are frost-free (long stem, the valve seat is inside the warm wall), disconnecting the hose is enough. Cost: nothing. This single step prevents a large share of spring leak calls.
2. Insulate pipes in crawlspaces, garages and unheated spaces
Foam pipe sleeves from any hardware store, slit lengthwise, pushed onto the pipe and taped at the seams. Cover every inch of exposed supply line; a gap at a fitting is where it freezes. Cost: $1 to $3 per foot. For a typical crawlspace, an afternoon’s work.
3. Close crawlspace vents
If your crawlspace has operable vents, close them for winter and open them again in spring. Replace broken vent covers. Stuff foam blocks into vents that don’t close. Cold air moving through a crawlspace is what freezes pipes there.
4. Add heat cable where insulation isn’t enough
For a pipe that has frozen before, or one in a spot that stays well below freezing (a garage ceiling, an exterior wall you can access), self-regulating heat cable wrapped along the pipe and plugged in for the season keeps it above freezing. Cost: $30 to $100 per run. Follow the manufacturer’s instructions exactly; don’t overlap cable or cover it with insulation unless the product allows it.
5. Seal air leaks near pipes
Gaps where pipes enter the house, around the sill plate, around dryer and furnace vents. A can of spray foam or a tube of caulk. Cold air blowing directly on a pipe is worse than cold still air.
6. Know where your main shutoff is
Find it now, not during the emergency. In most Indianapolis basements it’s where the water line comes through the foundation wall near the meter. In slab and crawlspace homes, check near the water heater or a valve box in the front yard. Turn it once to make sure it moves. Our emergency page has more on this.
What to do during a cold snap
When the forecast shows nights in the teens or below:
- Open cabinet doors under kitchen and bathroom sinks on exterior walls so room air reaches the pipes.
- Let a faucet drip. A pencil-thin trickle of cold water from the faucet farthest from where the water enters the house keeps water moving and relieves pressure. It costs a few cents a night. Do this especially for any faucet fed by a pipe that has frozen before.
- Keep the thermostat steady. Don’t set it back more than a few degrees overnight during the coldest stretches. The cost of running the furnace is nothing next to a burst pipe.
- Keep the garage door closed if there’s plumbing in the garage or above it.
- If you’re leaving town, set the heat no lower than 55°F, shut off the main and open the faucets to drain the lines, or have someone check the house daily.
If a pipe is already frozen
You turn on a faucet and nothing comes out, or just a trickle, while other fixtures work. That’s a frozen section between the main and that faucet.
- Open the affected faucet and leave it open. As the ice melts, water needs somewhere to go, and flow helps melt the rest.
- Find the frozen section. Follow the pipe from the faucet back toward the main. It’s usually in one of the locations above. Frost on the pipe or a section that’s noticeably colder is the spot.
- Warm it gently, from the faucet end backward. A hair dryer, a heating pad, towels soaked in hot water, or a space heater pointed at the area. Start near the faucet so melting water can escape, and work toward the ice.
- Never use an open flame. No torches, no heat guns on high. Besides the fire risk, the steam pressure in a sealed pipe can rupture it.
- Check for leaks as it thaws. If water starts appearing from the pipe, a joint or a wall, shut off the main immediately and call us. The pipe split while frozen; the thaw just revealed it.
- Call if you can’t find or reach the frozen section, if it’s inside a wall, or if more than one fixture is affected. A frozen pipe that hasn’t burst yet is time-sensitive, because the ice is still expanding.
What a frozen or burst pipe costs in Indianapolis
Repairing a split section in an accessible spot typically runs $250 to $500. Inside a wall or crawlspace, $250 to $900, depending on how much pipe has to be replaced and what has to be opened to reach it. The water damage from a burst pipe that ran for hours routinely costs several thousand dollars more than the plumbing repair. We handle frozen and burst pipes 24/7 with no overtime fee, and we’ll insulate or reroute the line so it doesn’t happen next year. See leak detection and pipe repair and the Indianapolis plumbing cost guide.
Homes that need extra attention
Pre-1950 homes in Irvington, Fountain Square, Garfield Park, the Old Northside and similar neighborhoods often have galvanized steel supply lines, which are already weakened by decades of internal corrosion and split more easily when frozen. If your home has galvanized pipe and a freeze history, repiping that run in PEX (which tolerates freezing far better than steel or copper) is worth discussing. See repiping.
Slab homes in Perry Township, Fishers and Avon have supply lines under the concrete, which rarely freeze, but the lines where they come up through the slab into exterior walls do.
Rentals and vacant properties are the ones we find in February with every pipe in the house burst because the heat was off. If you own one, set the thermostat and check it, or winterize it properly.
Frequently asked questions
At what temperature do pipes freeze in Indianapolis?
Exposed pipes can freeze when the air around them drops below about 20°F for several hours, and faster with wind. Pipes inside insulated, heated walls are safe at almost any outdoor temperature. Indianapolis sees enough nights in the teens every winter that any exposed pipe should be treated as at risk.
Should I let my faucets drip all winter?
No, only during cold snaps when nights drop into the teens or below, and only the faucets fed by pipes in vulnerable spots. A steady drip all winter wastes water for no benefit on the mild nights.
How long does it take for pipes to freeze?
An exposed, uninsulated pipe can freeze in six to eight hours at 20°F, and faster in single digits or wind. A pipe with foam insulation might take a day or more at the same temperature, which usually gets you through the cold snap.
Does homeowners insurance cover frozen pipes?
Usually yes for the sudden water damage from a burst pipe, as long as you maintained heat in the home. Policies commonly exclude damage in a house left unheated or vacant. The pipe repair itself is often not covered. We document the cause for your claim.
Can PEX pipe freeze?
PEX can freeze, but it expands with the ice and usually returns to shape without splitting, which is why we use it when replacing frozen copper or galvanized lines. Fittings can still fail, so PEX in unheated spaces should be insulated too.
My pipes froze last year. Will it happen again?
If nothing changed, yes. The fix is one of: insulate the run, add heat cable, reroute the pipe into heated space, or close off the cold air that reaches it. We’ll tell you which makes sense for your spot when we repair it, or on a scheduled visit before winter.
An hour with foam sleeves and a trip to the crawlspace in November is the cheapest plumbing work you’ll ever do. If a pipe freezes anyway, or you’d rather have us winterize the house, call (317) 676-7903. We handle frozen and burst pipes across Indianapolis 24 hours a day, at the same price day or night.