Last reviewed: 12 November 2026
Prepare exposed pipes and tanks before cold weather
Ask a qualified plumber which exposed pipes, valves and fittings need insulation for your building and local conditions. Use suitable insulation that stays secure and dry, and keep shut-off valves and inspection points accessible.
Protect rooftop tanks and connected pipes using a method appropriate to the tank material and installation. Do not block a tank’s designed vents or overflow, and do not use an improvised heat source near plastic, wiring or flammable material.
If a pipe may be frozen
If water flow stops during freezing weather, check for a visible issue only if it is safe to do so. Know where the household shut-off valve is. Do not use a blowtorch, open flame or other direct high heat to thaw a pipe.
If the pipe is accessible and not damaged, follow local plumbing advice for gradual warming. If you cannot identify the pipe, suspect a leak, or are unsure, contact a qualified plumber rather than forcing a fitting or applying heat.
If a pipe bursts or water enters the building
If safe, turn off the water at the main shut-off and keep clear of wet electrical equipment. Arrange a qualified plumbing repair and follow building or utility instructions before restoring the supply.
If a tank or supply may have been contaminated during damage or repair, ask the water authority what to do before using the water for drinking or cooking. A repair does not by itself confirm water quality.
Frequently asked questions
Which pipes should I insulate?
A qualified plumber can identify exposed pipes, fittings and valves that need protection for your building and local conditions. Keep access points usable and follow the insulation maker’s instructions.
Can I thaw a frozen pipe with a flame?
No. Do not use a blowtorch or open flame. Follow local plumbing advice for safe gradual warming, or contact a qualified plumber.
What should I do if a pipe bursts?
If safe, shut off the main water supply, stay clear of wet electrical equipment and call a qualified plumber. Check with the water authority if contamination may have affected the supply.
Should I cover every rooftop tank completely?
Use protection appropriate to the tank and installation, but do not block designed vents or overflows. Ask a qualified plumber about a safe cold-weather solution.
Sources and further guidance
Related water guides
- How should I clean a rooftop water tank?
Inspect the tank and its cover, keep out debris and pests, and use trained help for work that is unsafe to do yourself.
- What should I do about water after a flood or pipe break?
Treat floodwater, damaged tanks and disrupted pipes as reasons to check local advisories before using household water for drinking or food.
- How can I store household water safely in summer?
Start with water from a source or treatment you trust, then protect it with a clean, closed container and careful handling.