Yes, pipes can still burst if the water is turned off. Shutting the main valve stops new water from entering the plumbing, but the water already sitting in the pipes can still freeze, expand, and split them. Only draining the system completely removes that risk, which is why a shutoff alone is not reliable freeze protection.
Protecting your home’s piping from freezing temperatures is crucial to prevent burst pipes and the water damage that follows. Many Greenwood residents aren’t sure which measures actually work and wonder whether turning off the water supply is enough. Complete Comfort Heating, A/C & Plumbing Repair is a trusted choice for homeowners who need experienced plumbing experts in Greenwood, IN, and our team explains how your pipes freeze and what keeps them intact.
Key Takeaways
- Turning off the main water valve does not empty the pipes, so the water left inside can still freeze and burst them.
- Draining the plumbing system after shutting off the water is the only way to remove the water that causes freeze damage.
- The American Red Cross recommends keeping the heat at 55 degrees Fahrenheit or higher when you leave home during cold weather.
- Letting cold water drip from faucets served by exposed pipes helps keep those pipes from freezing.
- Many burst pipes are discovered during the thaw, when water starts flowing through a split that formed while the pipe was frozen.
Will Turning Off Your Water Prevent Pipes From Freezing and Bursting?
No, turning off your water does not prevent your pipes from freezing. Frozen pipes are extremely damaging to a home’s plumbing system and can cause everything from small leaks to burst pipes that leave your home with serious water damage.
Many homeowners believe turning off the main water supply will keep pipes from bursting, but that isn’t the case. The shutoff valve only stops fresh water from flowing in. The supply lines, the water heater, and every pipe between the valve and your fixtures still hold water, and that water can freeze in an unheated crawl space, garage, or exterior wall just as easily as before. Recognizing the warning signs of frozen pipes is crucial to preventing that kind of damage.
How to Prevent Your Pipes From Bursting After Shutting Off Your Water
The best way to prevent pipes from bursting after you shut off the water is to drain the entire system. Draining removes the leftover water inside the pipes, so there’s nothing left to freeze.
Draining a home’s plumbing correctly takes more than opening a faucet. Water collects in low spots, in the water heater, and in fixtures and appliance lines, and some homes need compressed air to clear lines completely. It’s best to have a professional plumber drain and winterize your system if you plan to leave the water off during freezing weather, especially for a vacant home or a long winter trip.
If you shut off your water supply for a short time, you won’t have running water for fixtures like toilets. You can get around this by filling your bathtub with water before shutting the main and using a bucket to refill the toilet tank after flushing. Use the bathtub water as your main supply until the water is back on.
When a pipe does freeze, how you thaw it matters. The American Red Cross advises keeping the faucet open while you thaw a pipe so water can flow as the ice melts, and never using a blowtorch, kerosene or propane heater, or any other open flame. Safe heat sources include an electric heating pad or a hair dryer. If you can’t find the frozen section or can’t reach it, call a plumber.
How to Prevent Your Pipes From Freezing
Keeping pipes warm and water moving is the most practical way to prevent freezing for most Greenwood homeowners, since shutting off and draining the system isn’t realistic when you live in the home. These preventive measures help keep your plumbing in good shape through a central Indiana winter. It’s also essential to know what to do if your pipes freeze, because quick action limits damage.
Use Pipe Insulation
Pipe insulation slows heat loss from your pipes and helps them stay above freezing when temperatures drop. Foam pipe sleeves are the most common type, and they work best on pipes in unheated areas like crawl spaces, garages, attics, and basements with exterior walls. Insulation slows freezing rather than preventing it entirely, so it works best alongside other measures during a long cold snap.
Allow Your Faucets to Drip
Letting a faucet drip keeps water moving through the pipes, which makes it harder for that water to freeze. The Red Cross recommends letting cold water drip from faucets served by exposed pipes during very cold weather. A slow, steady drip is enough.
Many plumbers recommend dripping the faucet farthest from where water enters the house, since that keeps water moving through the longest run of pipe. Focus on fixtures along exterior walls or above unheated spaces, which are the most likely to freeze.
Open Cabinet Doors
Opening kitchen and bathroom cabinet doors lets warm room air reach pipes under sinks, especially sinks on exterior walls. Move cleaning products and chemicals out of reach of children and pets while the doors are open.
Keep the Heat Steady
Keeping your thermostat at the same temperature day and night helps prevent pipes in walls and floors from cooling off overnight. If you’ll be away during cold weather, leave the heat on and set no lower than 55 degrees Fahrenheit, as the Red Cross recommends.
Disconnect Garden Hoses
Disconnecting and draining garden hoses before the first freeze keeps water from backing up into outdoor spigots and the pipes behind them. Close any interior shutoff valve that feeds an outdoor spigot, then open the spigot outside to let it drain.
What to Do If a Pipe Bursts
If a pipe bursts, shut off the main water valve right away to stop the flow, then call a plumber. Knowing where your main shutoff valve is before winter can save precious minutes. In many central Indiana homes, it’s in the basement, crawl space, or utility room near where the water line enters the house.
Once the water is off, these steps help limit damage:
- Turn off electricity to any area where water is near outlets, appliances, or the electrical panel, but only if you can reach the breaker without standing in water.
- Open faucets to drain remaining water from the lines and relieve pressure.
- Move furniture, rugs, and stored items away from the leak.
- Take photos of the damage for your records.
- Call a plumber to repair or replace the damaged section.
A split section of pipe needs proper repair, and in older homes with aging supply lines, pipe replacement may be the better long-term fix than patching one spot after another.
Misconceptions About Frozen Pipes
Several common beliefs about frozen pipes lead homeowners to take the wrong steps. These are some of the most common ones.
Pipes Only Burst While They’re Freezing
Pipes often split while they’re frozen, but the damage usually isn’t discovered until the thaw. While the pipe is full of ice, the split stays plugged. Once the ice melts and water pressure returns, water pours out through the crack, which is why many homeowners first notice a burst pipe when temperatures start to rise.
Ice Splits the Pipe Right Where It Freezes
Ice doesn’t always split the pipe at the exact spot where it forms. Water expands as it freezes, and that expansion creates pressure that can split pipes of any material. When an ice blockage forms, the pressure often builds in the section of water trapped between the ice and a closed faucet, so the break can happen several feet away from the frozen spot.
That’s one reason a dripping faucet helps. An open faucet gives that pressure somewhere to go.
Homes in Colder Climates Are Always More Prone to Burst Pipes
Homes in colder climates face freezing temperatures more often, but that doesn’t always make them more likely to have burst pipes. Homes built for cold weather usually keep pipes inside heated spaces and insulated walls. Homes in milder climates often have pipes in exterior walls, attics, or crawl spaces with little protection, so a rare hard freeze can do more damage there.
Central Indiana falls in between. Our winters bring regular hard freezes, but many older homes still have pipes in crawl spaces, garages, and exterior walls that were never insulated. In our service calls throughout Greenwood, those unprotected runs are the first places we check after a freeze.
Frequently Asked Questions About Frozen and Burst Pipes
Should I Shut Off My Water When I Leave for Vacation in Winter?
Yes, shutting off the main water valve before a winter trip is a smart move, as long as you also leave the heat on. Shutting off the water limits how much can leak if a pipe does burst, and draining the lines adds another layer of protection for longer trips.
Which Pipes Are Most Likely to Freeze?
The pipes most likely to freeze run through unheated or exposed areas, including crawl spaces, garages, attics, exterior walls, and outdoor spigots. Pipes under sinks on exterior walls are also at risk, especially during windy cold snaps.
Can PEX Pipes Burst When They Freeze?
PEX pipes are more flexible than copper and handle freezing better, but they can still split during a hard freeze. The fittings and connections are often the weak points, so PEX lines in cold areas still need insulation and protection.
How Do I Know If My Pipes Are Frozen?
A faucet that produces only a trickle or no water at all during freezing weather is the most common sign of a frozen pipe. You may also see frost on exposed pipes or notice unusual odors from a drain. Pipes along exterior walls and in crawl spaces are usually the first to freeze, so start there when you look for the problem.
Protecting Greenwood Pipes Before the First Hard Freeze
Pipes can burst even when the water is turned off, because water left in the lines can still freeze and split them, so draining, insulating, and keeping your home heated are the real protection. Complete Comfort Heating, A/C & Plumbing Repair has helped Greenwood residents protect their plumbing since 2003, and our plumbers can drain and winterize your system, insulate vulnerable pipes, and repair freeze damage. To get your home ready for winter, schedule a plumbing inspection today.