Plumbers in Saint Paul, MN

When the pipe that freezes is not in your house

Most freeze advice is about pipework inside a building. There is a version of the problem here that is different in kind.

In a severe winter, frost penetrates further into the ground than usual, and it can reach the buried service line that brings water from the main into your property.

The symptom is distinctive: no water at all, rather than reduced flow, and typically with neighbours unaffected.

What makes it different is that you cannot do anything about it. The pipe is buried, often under a driveway or a road, and there is no access. A hairdryer and a bit of patience, which is the right answer for a pipe under a sink, is not applicable.

So the first call is to your water provider rather than to a plumber. They will know whether other properties in the area are affected, whether it is a known issue on your street, and how they are handling it. Thawing a buried service line takes specific equipment and is usually their work rather than yours to arrange.

Why you might be told to run a tap

In cold winters, providers in this region sometimes advise specific customers to run a continuous small stream of water.

It is not folklore. Moving water is considerably harder to freeze than still water, and a service line with a constant trickle through it will keep flowing in conditions that would freeze a static one.

Three things are worth knowing about it.

It is targeted advice for particular properties, usually ones with a known history or with lines in a vulnerable position, rather than a general instruction to everyone.

It should come from your provider rather than from a neighbour, because they know which properties are at risk.

And there are normally arrangements about the water used, so it is worth asking rather than assuming you will be billed for months of running water.

Snow is insulation, and clearing it has a cost

Here is a non-obvious factor that genuinely affects whether a service line freezes.

Undisturbed snow is a good insulator. Ground under a deep, unbroken layer of it stays substantially warmer than ground that is bare.

Which means the places frost drives deepest are the places we clear: driveways, paths, parking areas, and anywhere snow is compacted by traffic.

If your water service line runs beneath a driveway or a regularly cleared path, it is more exposed than one running under an untouched lawn. That is worth knowing, and it is worth mentioning to your provider if the line has frozen before, because it may explain why yours froze when your neighbour’s did not.

Inside the house, and under the garden

For indoor pipework in century-old construction, the failures are consistent enough to plan for: runs in an unheated basement, pipe against an exterior wall, and anything above an unheated porch or overhang.

The useful distinction is between insulation and air movement. Insulation slows heat loss but adds no heat, so a pipe with cold air being delivered straight onto it through a gap around a joist will freeze regardless of lagging. Sealing that gap frequently does more.

And during a severe stretch, opening cabinet doors on outside walls is genuinely effective, because it lets heated room air reach pipework the heating system otherwise never touches.

Outside, the annual freeze-thaw cycle works on buried drainage. Century-old clay and cast iron under mature street trees, in ground that moves every year, is the reason a camera survey before buying an older house here is worth considerably more than it costs.