How to Prevent Frozen and Burst Pipes This Winter

Why Irish Homes Are Particularly Vulnerable to Freezing

Many Irish houses—especially period properties and homes built before modern building standards—feature cold water storage tanks and copper pipework routed through unheated attic voids and external cavity walls.

When arctic weather systems cause temperatures to plunge below -3°C for consecutive nights, stagnant water inside uninsulated pipes quickly freezes. Because water expands by 9% as it solidifies into ice, the trapped pressure has nowhere to go and splits the pipe along its weakest seam.

1. Insulate All Exposed Pipework (Lagging)

Inspect your attic, basement, utility room, and garage for bare copper or plastic pipework. Fit high-density polyethylene or closed-cell foam lagging around all pipes, ensuring seams and 90-degree elbows are securely taped with waterproof duct tape.

Pay special attention to the cold water feed pipe leading to your attic expansion tank and the overflow pipes that exit through the eaves.

2. Isolate and Drain Outside Garden Taps

Outside garden bib taps are exposed directly to ambient freezing air. Locate the dedicated internal isolating valve for the outside tap (usually under the kitchen sink or utility cabinet), turn it off, and open the outside tap to drain any residual water from the line.

If you do not have an internal isolation valve, install an insulated thermal tap jacket over the outdoor fixture.

3. Keep Your Heating on a Low Background Frost Setting

If you are leaving your home unoccupied for work or holidays during winter, never turn your central heating completely off. Set your room thermostat or programmable timer to a constant background temperature of 13°C to 15°C.

Most modern boilers also incorporate built-in frost protection that automatically fires the burner if internal system temperatures drop below 5°C, provided the electrical supply remains on.

4. What to Do If You Suspect a Pipe Has Already Frozen

If you turn on a tap on a freezing morning and only a trickle or no water emerges, one of your supply lines is likely frozen.

Immediately shut off your main internal stopcock to prevent flooding once the ice thaws. Inspect visible pipe runs for bulging, cracking, or frost coating. Gently warm the frozen section using a hairdryer or towels soaked in hot water—starting from the tap end and working backward toward the frozen blockage.

NEVER use a naked flame, blowtorch, or heat gun on plumbing pipes, as rapid boiling water can cause violent steam explosions or ignite nearby timber rafters.