Frozen Pipes in Limavady — How To Thaw Them Safely

Why does this catch so many houses out here?

Any pipe that never got lagged — in a loft, a garage, an outbuilding, or buried in an external wall — is suddenly a solid stick of ice after one cold night, and a tap that won't run, or barely dribbles, is the first sign. It happens to houses in town too, but it's felt hardest on farms and older properties out toward Feeny, Dungiven and Drumsurn, where supply runs are long and outbuildings are cold by design.

The good news is that catching it early, before anything splits, is the easy version of this problem. It's only once a frozen pipe has already cracked, quietly, under the pressure of expanding ice, that thawing turns into a flood — and that's the version worth avoiding altogether with a bit of autumn prevention.

How do we thaw a pipe without making things worse?

1. Stopcock off. You don't yet know whether the ice has already split the pipe — frozen water expands, and a hidden crack only floods once it melts. Turning the water off first is free insurance.
2. Open the affected tap. It gives the melting ice somewhere to go and lets you know the moment water starts moving again.
3. Warm gently from the tap end back. A hairdryer on low, kept moving, or towels wrung out in warm (not boiling) water laid along the pipe. Working from the tap backward means melted water has somewhere to drain rather than being trapped between two ice plugs.
4. Be patient. This can take twenty minutes or a couple of hours depending on how solid the ice is. Rushing it with too much heat is exactly how a stressed pipe splits.

What to never do: a blowtorch, a naked flame of any kind, or boiling water poured straight onto the pipe. Sudden heat on metal or plastic that's already under strain from the ice is a reliable way to turn a frozen pipe into a split one.

What if the pipe's already split?

A split usually shows itself as a thin crack or seam, sometimes with a bulge in the pipe either side of it, and it may not leak a drop until the ice inside finally melts. If you can see or suspect a split, the safest move is to leave the stopcock closed and stop applying any heat — you're better off with a frozen, dry pipe than a thawed, flooding one while you wait for a plumber.

Take a photo if you can, note roughly where along the run the damage sits, and mention it when you ring — it means the plumber arrives with the right fittings rather than guessing on the doorstep.

How do we stop this happening every winter?

Focus effort where cold air actually reaches the pipe: lofts, garages, outbuildings, and any run along an external wall. On farms and rural properties around Drumsurn, Feeny and the wider Roe Valley, long supply pipes crossing unheated outbuildings are the classic weak point — a length of foam lagging around each run, plus keeping outbuilding doors shut on the coldest nights, heads off most of the trouble before it starts.

A couple of extra habits help on genuinely hard nights: leaving a trickle running from the most exposed tap keeps water moving and harder to freeze solid, and leaving loft hatches or under-sink cupboard doors slightly open lets a little of the house's warmth reach otherwise isolated pipework. None of it is glamorous, and all of it is cheaper than the flood it prevents.