Key Takeaways
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The "Backflow" Danger: The #1 most common burst pipe in Charleston isn't in your wall—it's the irrigation backflow preventer in your front yard.
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Tankless Trouble: If you have an outdoor tankless water heater (common in the south), it needs specific attention today to survive the night.
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Crawl Space Science: Closing your foundation vents is critical to keeping the wind chill away from your sub-floor plumbing.
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The "Drip" Strategy: It’s not just an old wives' tale. A dripping faucet relieves pressure and can save you thousands in repairs.
If you walk into a hardware store in Ohio in January, you’ll see shelves lined with rock salt and heavy-duty snow shovels. If you walk into a hardware store in Charleston this week, you’ll likely see a different scene: panicked homeowners staring at the plumbing aisle, wondering what "heat tape" is.
We live in a subtropical paradise. Our homes are designed with high ceilings to let heat rise and large windows to capture the sea breeze. But when a rare Arctic blast targets the Lowcountry—like the one forecasted for this weekend—our "coastal construction" becomes our biggest vulnerability.
Forecasts are calling for sub-freezing temperatures and potential snow accumulation. While the kids are hoping for a school cancellation, savvy homeowners know that 20 degrees in Charleston feels very different than 20 degrees in the mountains. The humidity, the wind, and our exposed plumbing create a perfect storm for property damage.
As your local real estate resource, I want to make sure your home is still in perfect condition when the thaw comes on Monday. Here is your battle plan.
1. The #1 Casualty: Your Irrigation Backflow Preventer
If you drive around town after a hard freeze, you will see geysers of water shooting up in front yards - this is almost always the irrigation backflow preventer.
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What it is: That brass assembly sticking out of the ground near your water meter.
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Why it bursts: It is completely exposed to the elements.
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The Fix: If you don't have a dedicated insulated cover (which looks like a fake rock or a green pouch), wrap it in old towels or burlap now, and cover that with a heavy-duty trash bag taped securely at the bottom. The insulation keeps the heat in; the plastic keeps the wind and moisture out.
2. The "Tankless" Trap
In the last five years, thousands of homes have switched to Tankless Water Heaters (brands like Rinnai or Navien) for efficiency. To save garage space, builders often mount these on the exterior of the home.
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The Risk: While these units have built-in freeze protection, that protection only works if you have power and gas.
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The Strategy: If we lose power, your freeze protection fails. If the grid goes down, you must drain the unit immediately to prevent the heat exchanger from cracking. Check your manual today for the specific "drain down" procedure—it usually involves twisting two service valves at the bottom of the unit.
3. Crawl Space vs. Slab: Know Your Foundation
How you prep depends entirely on what your house is sitting on.
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Raised Slab (Common in newer Mount Pleasant/Daniel Island homes): Your pipes are likely in the attic or walls. The danger here is the attic getting too cold. Open your attic access slightly to let warm house air rise up, and leave cabinet doors under sinks open so your home's HVAC can warm the pipes.
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Crawl Space (Common in West Ashley/Downtown/Historic homes): Your pipes are running underneath your feet, exposed to the wind.
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Action Item: Go outside right now and check your foundation vents. They should be closed. If they are broken or stuck open, cut a piece of cardboard or foam board to fit over them. Stopping the wind is 90% of the battle.
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4. The "Drip" is Non-Negotiable
You have heard it a million times, but do you know why you need to let your faucets drip? It’s not just to keep the water moving. It’s to relieve pressure. When water freezes, it expands. If a pipe freezes, the pressure builds up between the ice blockage and the closed faucet until—pop—the pipe bursts. A dripping faucet gives that pressure an escape route. The Rule: Drip the faucet that is furthest from your main water shut-off valve. Both hot and cold handles should be slightly on.
5. Do Not Forget the "Living" Assets
Real estate isn't just bricks and mortar; it's your landscaping too.
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Palms: Sabal Palms are hardy, but smaller ornamental palms (like Robellinis) will die in a hard freeze. Wrap the "heart" (the top where the fronds come out) with frost cloth or burlap.
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Citrus: If you have a lemon or lime tree, it needs to be covered completely. Stringing non-LED Christmas lights (the old-school hot ones) under the cover can generate just enough heat to save the tree.
Stay Warm, Stay Safe This cold snap will be over in 48 hours. A little preparation today saves a massive headache (and insurance claim) on Monday. If you do run into issues, I have a list of trusted local plumbers who prioritize my clients. Just shoot me a text.
By Dustin Guthrie Realtor, Carolina One Real Estate
📞 Call/Text (843) 697-7757
📧 [email protected]
📸 Instagram @dustin_guthrie_realtor
