Will Shutting Off Water Keep Pipes from Freezing

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Posted Nov 7, 2024

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Shutting off the main water supply can provide some protection against frozen pipes, but it's not a foolproof solution. This approach can help prevent pipes from bursting and causing costly damage.

Leaving the faucet dripping can help prevent pipes from freezing, but it's not the most efficient solution. According to the article, a steady drip of water can help prevent pipes from freezing, but it's not a reliable method.

Shutting off the water supply is a more effective solution, but it's essential to know which pipes to shut off to be effective. The article notes that shutting off the water supply to the entire house can be counterproductive if it's not done correctly.

Proper insulation and sealing of pipes can also help prevent pipes from freezing, which is a crucial step in protecting your home.

Preventing Frozen Pipes

Shutting off your water supply might not be enough to prevent frozen pipes. Pipes can still burst even after you turn off your home's water, as the water inside them can still freeze and cause damage.

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To prevent frozen pipes, consider insulating water pipes that may be vulnerable to the cold. Pipes close to exterior walls or in unheated basements can be wrapped with pieces of insulation.

In areas with cold weather, weather scientists advise taking plumbing precautions at around 20° Fahrenheit. The greatest risk of damage is when temperatures hit single digits over several days.

Before cold weather hits, have your plumber's phone number handy and test the location of your water shut-off valve. Knowing where it is and how to use it can save you time and hassle in case of an emergency.

Here are some additional steps to take:

  • Keep your meter pit or curb stop valve accessible and the lid closed.
  • Turn off and drain automatic and manual sprinkler systems before the first freeze.
  • Disconnect hoses from outdoor faucets and drain the pipes.
  • Winterize unheated or vacant buildings, especially fire protection systems.
  • Block off crawl space vents with insulation to prevent cold wind from getting to pipes under the house.

By taking these precautions, you can reduce the risk of frozen pipes and the damage they can cause.

What to Expect

If you shut off the water supply to your home, you'll be able to prevent pipes from freezing in most cases.

This is because freezing water expands and can cause pipes to burst, but if the water is shut off, there's no water to freeze.

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Frozen pipes are more likely to happen in exposed pipes, which are typically located outside or in unheated areas like the garage or basement.

These pipes are more susceptible to freezing because they're not protected by the warmth of your home.

In areas where the temperature is consistently below freezing, shutting off the water supply may not be enough to prevent pipes from freezing.

In these cases, you may need to take additional steps, such as insulating exposed pipes or letting cold water drip from the faucet served by exposed pipes.

Frozen Pipe Consequences

Shutting off the water supply can indeed help prevent pipes from freezing, but what happens if your pipes do freeze? The consequences can be severe. Water expands by 9% as it freezes, which can cause pressure to increase in a closed plumbing system. This increased pressure can lead to a burst pipe. In fact, the pressure can go from 60 PSI to over 200 PSI, causing the plumbing to fail.

Shutting Off Water

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Shutting off water can provide a false sense of security against frozen pipes.

Pipes can still burst in freezing temperatures even after you turn off your home's water.

Shutting off the water supply may not prevent pipe bursting because the pipes will still have water inside them, which can freeze and potentially burst.

When a Concern

Your home's pipes are at a higher risk of freezing when the temperature outdoors drops to 32 degrees Fahrenheit or lower. This prolonged cold weather can cause the water inside your pipes to develop crystals, freeze, and spread.

Supply lines and pipes in certain areas of your home are more prone to freezing than others. Exterior lines or plumbing that runs within outdoor walls have the highest risk of freezing since they're subjected to cooler temperatures.

Water lines deep within your home, especially in rooms that are heated, are less likely to freeze. This is because they're not exposed to direct cold and air circulation helps to keep them warm.

Frozen pipes can cause significant leaks, burst pipes, and severe water damage.

If a Pipe Has Frozen

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Don't wait for nature to take its course. Safely thaw the pipe as soon as possible or call a plumber for help.

Shut off the water or test the shut-off valve to prevent water from gushing from the pipe when it thaws.

Slowly apply heat, starting close to the faucet end of the pipe, with the faucet open.

Drain Water

Draining water from your pipes can help prevent pipes from freezing, but it's not always the best solution. Shutting off your home's water supply and draining the piping system isn't ideal for most residents.

Draining the water from your pipes is a good idea, but it's not a guarantee against pipe bursting. Pipes can still burst in freezing temperatures even after you turn off your home's water.

You can prevent pipes from freezing by letting cold water drip from the faucet served by exposed pipes. This will help prevent pipes from freezing.

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Frozen pipes are a real concern when temperatures drop below 32 degrees Fahrenheit. In areas with milder temperatures like Hampton Roads, older homes may not have proper insulation to prevent pipes from freezing.

Pipes on exterior walls, attics, and basements are more prone to freezing due to inadequate insulation. Exterior lines and plumbing that runs within outdoor walls have the highest risk of freezing.

To minimize the risk of frozen pipes, make sure to insulate exposed pipes in unheated areas like the attic and basement. This can be as simple as wrapping pipes with foam pipe insulation or using heat tape.

If you suspect a pipe has already frozen, don't wait for nature to take its course. Shut off the water supply or test the shut-off valve before attempting to thaw the pipe.

Here are some areas to focus on when inspecting your home for potential frozen pipes:

  • Exterior walls
  • Attics
  • Basements

Remember, slower is better when thawing a frozen pipe. Apply heat slowly and carefully, starting close to the faucet end of the pipe, with the faucet open.

Frozen Pipe Misconceptions

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Frozen pipes are a common problem in cold weather, but there are several misconceptions surrounding them. One misconception is that freezing pipes only happen in extremely cold temperatures, but in reality, pipes can freeze even in temperatures as low as the mid-20s.

Another misconception is that frozen pipes are always a sign of poor insulation or a leaky pipe, but this is not always the case. In fact, well-insulated and leak-free pipes can still freeze if the water inside them is not properly drained.

Some people think that frozen pipes will always burst, but this is not true. While it's possible for frozen pipes to burst, it's not a guarantee, and in many cases, the pipe will simply remain frozen until the water inside it thaws.

Frozen pipes can happen in any type of pipe, including copper, PVC, and PEX.

Frequently Asked Questions

Should I leave faucets open after shutting off water?

Yes, leave faucets open after shutting off water to drain pipes, especially for extended periods

Will pipes burst if there is no water in them?

No, pipes can't burst without water, but freezing temperatures can still cause damage. Learn why pipes are vulnerable to freezing even when empty

Lou Tarchiani

Senior Writer

Lou Tarchiani is a passionate writer, avid traveler, and animal lover. She has a diverse background, having worked in fields ranging from marketing to education. Her travels have taken her to over 20 countries, where she has immersed herself in local cultures and gained unique perspectives on the world.

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