Spooky Household Noises That You Should Investigate

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man startled awake by intruder
ShutterstockThose creepy noises that you hear in the night might be the sound of your house telling you that repairs are needed.
By Christopher Solomon for BobVila.com

Homes make strange noises. They're built of many different materials -- glass, concrete, wood -- that expand and contract at different rates.

"[But] the most noise your house should make is a popping sound, like your knuckles cracking, and only once in a while," said Bill Richardson, former president of the American Society of Home Inspectors and owner of Responsive Inspections in Bosque Farms, New Mexico.

If your home is making noises that rival the best of Metallica, then it may be sending you signals that there's a problem. We asked the experts to catalogue some of the more worrisome pops, hisses, groans, creaks and knocks, and tell us what they mean and how they can be remedied.

Here are the top seven problem noises and how they can be solved.

1. What is that clanking sound when I turn on the heat?
The problem:
When most homeowners first turn on their heating system in the fall, they hear a little moaning and groaning as the heating system expands and rubs against the frame of the house, says Mike Kuhn, the New Jersey owner of HouseMaster inspection service and coauthor of "The Pocket Idiot's Guide to Home Inspections." With a baseboard hot-water system, you can also expect "normal clinking and knocking," says Kuhn. The circulator pump or pumps to the system, however, "should be silent when they run," says Kuhn. If you hear knocking or clanking, typically located at the boiler itself, it might be a sign of impending failure of the circulator pump, he says.

The solution: Get a repairman out to check on it, pronto.

2. There's a strange scratching sound coming from behind the walls.
The problem: If you hear strange noises like scratching and possibly chittering coming from places where no one lives in the house, you could have mice, squirrels, raccoons or even bats sharing your quarters, says Richardson. "Any kind of wild critter could be up in the attic," he says. And these freeloaders aren't just a nuisance; bats can carry deadly rabies. In the Southwest, the droppings of mice can spread hantavirus. Some animals will tear up insulation to nest or chew through siding and even electrical wires, causing fires.

The solution: As soon as you suspect an intruder, get on it: Set traps. (Call in a pro if the animal is stubborn or large.) Finally, prevent the problem from reoccurring by sealing up the entrances to your house with steel wool, metal sheeting, caulk and/or hardware cloth.

To keep raccoons away, put garbage in sealed, secure metal cans that can't be tipped. Bring pet food inside. After pests have been removed, make sure vents and chimneys are securely covered with mesh or a grille, so those spaces can still breathe.

3. There's no one in the house and I can still hear running water. How can that be?
The problem: "You definitely don't want to hear water running if nobody's using anything," says Richardson. The sound could indicate many things -- a busted pipe in a wall, under the floor or even in the irrigation system.

The solution: If you hear running water when you shouldn't, shut the main off and see if the noise goes away, says Richardson. If it does, you've got a leak somewhere - and a problem in need of fixing. Unless you're really handy and ready to do surgery on your home, call in a plumber.

4. I hear a bubbling (or cracking) sound coming from the water heater. Is that normal?
The problem:
A gas-fired hot-water heater works pretty much like boiling a pot of water: A fire is lit and the water inside is heated until it's ready for use. "A lot of sediment builds up at the bottom of a hot water tank, and that sediment works like an insulator," forcing the burner to work harder, Kuhn says. The strange noise you hear is the bubbling sediment - and a sign that the tank is probably experiencing fatigue and may be facing premature failure, he says.

The solution: Ideally, you should flush out your hot water tank every few months, using the drain valve near the bottom of the floor. "However, nobody does it," says Kuhn, because it can be a pain to do. If your water heater is already making these noises, draining it might help. "It could (work) a little bit longer, [and] it could go a lot longer," but the damage is probably done, says Kuhn.

5. My furnace is making a whistling (sucking) sound that it's never made before. Is it going to need to be replaced?
The problem: "What that can connote is that your filter hasn't been changed," says Richardson. "And your furnace is trying to pull in air from around it." That's not good, he explains, because it means the furnace is working too hard. "What it will do is start sucking exhaust gasses from the furnace into the house."

The solution: Install clean filters regularly -- "anywhere from three months to monthly, depending on atmospheric conditions," says Richardson.

6. I hear a switch turning on and off regularly but can't seem to isolate where it's coming from.
The problem: If you have a well for your water, you've got a well pump -- either in the house or above the well in your yard. "If you are sitting in your house and hearing the pump-switch click on and off, you may have a problem," says Kuhn. The pump pulls water from the well and into a holding tank, where it's stored for your use. If you're hearing it when you, say, turn on the faucet, something may be wrong. The pump "should not operate every time there is a call for water. The wear and tear would cause the pump to fail prematurely," he says. It's likely that you have a leak in the system. "The leak is either going to be in the well equipment itself, or in a fixture," says Kuhn." For example, a leaky toilet fixture could be causing the holding tank to drain.

The solution: First, check your fixtures for leaks. Then, if needed, call a plumber familiar with well systems.

7. What's that hissing sound?
The problem: If your home has gas, a strange noise that sounds like hissing could indicate a gas leak, says Richardson. Sometimes you can hear a hissing outside at the gas meter, or at a home's outdoor gas light post - places where the line could have corroded, he says. "You should be able to smell it, but you never know."

The solution: If you you smell gas around the gas main, don't mess with the gas shutoff unless you absolutely know what you're doing because any mishandling or spark could make things much worse, Richardson explains. If you hear the noise and smell the gas, immediately evacuate the house and call the gas company.

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