What should I do when a pipe freezes in a Michigan cold snap?
Open the faucet, keep the heat on, and warm the pipe gently with a hair dryer or warm towels, starting nearest the tap. If you find a split or any water, shut off the main and call a plumber. Do not use an open flame, torch or heater that can start a fire.
Thawing a pipe that has frozen and not yet split is the one job a homeowner can often manage. Leave the faucet open so the water can run once the ice clears, and work from the faucet back toward the frozen spot. Open the cabinet doors under sinks on exterior walls so the room's warmth reaches the pipe. If the pipe is in a wall you cannot reach, or no water returns, stop and call a plumber.
Never use a propane torch, a space heater left unattended or any flame to thaw a pipe. Old houses have wood framing and dry insulation, and a pipe that is hot to the touch can ignite them. A split that you can see, a stain that is spreading or a sound of running water means shut the main valve first, and then call.
- Find the main shut-off valve now, before you need it, and check it turns
- Leave faucets dripping on exterior walls in a hard freeze
- Keep the thermostat set steadily, including when you are away
- Open cabinet doors on exterior walls so heat reaches the pipes
- Disconnect garden hoses in October and close the outdoor spigot's inside valve
How deep does the ground freeze in Dearborn, and why does it matter?
Michigan building code requires footings 42 inches below grade because the ground can freeze that deep. That is a code depth, not a measured frost depth, and the building official can adjust it. It still shows how far cold can travel to buried water lines and unheated parts of a house.
The 42 inches comes from the Michigan Residential Code (Michigan Administrative Code R 408.30522). It is the depth footings must reach to sit below the zone that can freeze and heave. It is not a promise that the frost reaches that deep every winter, and no one should read it as an average. What it tells a homeowner is that a Michigan winter is expected to test everything above that line.
Water service lines are buried too, and an exposed or shallow section is vulnerable in a long cold stretch. Inside the house, the risks are the places where heated air does not reach: garages, rim joists, a pipe run in an exterior wall behind a kitchen or bathroom, and the corner of a basement beside a poorly sealed window. With about 130 nights a year at or below freezing, those places are tested every year.
Why does the leak start when it warms up?
Ice expands as it freezes and can split the pipe wall, but the ice itself plugs the break. When the pipe thaws, pressure from the supply pushes water out through the split. That is why damage appears after the temperature rises, often in a wall or ceiling where it cannot be seen for hours.
This is the cruel part of a Michigan freeze: the pipe looks fine during the cold. February's freeze-thaw swings and a warmer day after a hard spell are the moments a house wakes up wet. In some cases the water comes from an upstairs bathroom through a ceiling into the room below and then through the floor to the basement, soaking three levels from a single split.
A technician looks for the water path and does not stop at the visible stain. Wet insulation in an exterior wall can hold water against the framing, so it is removed rather than left to dry in place. A clean supply-line leak is Category 1, but the category rises the longer materials stay wet, and a basement drain that backs up during a thaw changes everything.
Does homeowners insurance cover frozen pipe damage in Michigan?
A standard homeowners policy often covers sudden and accidental water damage, such as a pipe that bursts, and usually not slow leaks or neglect. Policies can have conditions about keeping the heat on. Your insurer decides under your own policy, so read it and ask your agent early.
Frozen-pipe claims are among the more common ones in a cold climate, and they are often treated differently depending on whether the house was heated, occupied or vacant. A holiday trip in a December cold snap is one of the most common ways a house ends up unheated. Read the policy for any condition about maintaining heat, and ask the agent if you are unsure.
The state regulator's general advice is to describe the cause plainly, since a pipe that split, a sewer backup and a roof leak are separate causes that can be treated differently. Photos before anything is moved, the plumber's invoice and the crew's moisture readings give your insurer a clear record. Nothing here promises a result.
