Why Pipes Freeze Where They Do in a Berrien County House

Every winter, Berrien County gets a run of nights when the cold off Lake Michigan sets in and stays for days at a time. Most houses handle it fine. The ones that call us usually aren't unlucky, they just have a pipe running somewhere the builder never expected anyone to think twice about.

The usual suspects

In the older housing stock around downtown St. Joseph, Benton Harbor and the smaller towns along the lake, three spots account for most of the freeze calls we get. The first is any pipe run through an unheated crawlspace, especially on the north or west side of the house where the wind comes straight off the water. The second is a kitchen or bathroom pipe tucked into an exterior wall with little or no insulation behind it, common in homes built well before central heating was designed around modern plumbing runs. The third is a line through an attached but unheated garage, especially a laundry hookup or an outside hose bib that was never properly shut off for winter.

Newer construction has its own version of the same problem. A pipe run inside a cabinet against an exterior wall, under a kitchen sink or a bathroom vanity, can freeze even in a well-insulated house if the cabinet doors stay shut and warm room air never reaches it.

If you've just moved into an older downtown property, it's worth spending twenty minutes with a flashlight before the first hard freeze rather than after. Open every cabinet on an exterior wall, look at what's actually running through the crawlspace access, and check whether the garage hose bib has ever been shut off for winter. A previous owner may have lived there for years without ever needing to know, that doesn't mean the pipe isn't there.

What actually freezes them

What freezes a pipe is less about how cold it gets outside than about how long the cold sits and how little warm air reaches the pipe. A single hard night rarely does it. What causes trouble is a stretch of days where a pipe that's already marginally insulated never gets a chance to warm back up between cold snaps. Wind matters more than people expect. A pipe in a crawlspace with a gap in the foundation vent cover, or a missing skirting panel, sits in moving air, and moving cold air pulls heat out of a pipe far faster than still air at the same temperature.

Lake-effect snow actually works in your favor more than people assume. A deep, undisturbed snow cover over a foundation or a crawlspace vent acts like a blanket, holding ground temperatures steadier than a bare, wind-scoured yard. The years that cause us the most trouble aren't necessarily the coldest, they're the ones with a hard freeze before any snow has built up, when the ground and anything running close to it has nothing between it and the wind.

Before we can get there

• Shut off the water at the main if you can see or hear that a pipe has already split. A frozen pipe that's still frozen isn't leaking yet, but one that's starting to thaw can go from fine to flooding in minutes.
• Open the faucet closest to the suspected freeze, even just a trickle. Moving water is harder to freeze solid, and it gives built-up pressure somewhere to go as the ice starts to melt.
• Open cabinet doors under sinks on exterior walls so room heat can reach the pipe.
• Warm the area gently if you can safely reach it. A hair dryer or a space heater kept well clear of anything flammable works. Never use a propane torch, a blowtorch or any open flame on a pipe, that's how older galvanized and copper lines actually burst.
• If you have no water pressure anywhere in the house on a genuinely cold morning, call before you assume the worst. Sometimes it's a frozen meter or a service line issue rather than something inside the house.

Worth doing before the next cold snap

A little prevention goes further here than most people expect. Pipe insulation sleeves on anything running through a crawlspace or garage cost very little and take an afternoon. Sealing gaps where cable, phone or gas lines enter the foundation keeps cold drafts off pipes that are otherwise fine. On the coldest nights, a slow drip from a faucet on an exposed line is still one of the most reliable tricks there is. It costs a little in water, but it's cheaper than a repair.

If a pipe has already frozen, or you're not sure whether it has, call the State Street office. We cover Berrien and Cass County, and we'd rather talk you through what to check over the phone than have you find out the hard way that a small drip was actually a cracked fitting waiting to let go.