Burst pipes in Auckland have nothing to do with frost. Pipes here do not freeze. What bursts is a polybutylene fitting in a 1980s Glenfield home, a rusted galvanised line in a Grey Lynn villa, a split flexi hose in a Hobsonville Point townhouse, or a water service between the toby and the house that has been pulled apart by moving clay. Each has a different cause and a different fix, and the first step is always the same: stop the water.
First, turn the water off at the toby
The toby is the small box at the front boundary, in the berm or footpath, that holds the Watercare meter and the stop valve. Lift the lid, turn the valve clockwise until it stops, then open a low tap inside the house to drain the pressure from the pipes. If you live in an apartment or a newer townhouse, look for an isolating valve for your unit in a cupboard, behind the washing machine, under the kitchen sink or in a service riser in the corridor.
On older streets the toby is not always easy. It can be buried under turf in Mount Albert, seized after decades of never being touched in Onehunga, or shared between two or three properties on a subdivided state house section. If the valve will not turn, do not force it, because Watercare owns the meter. You will be talked through the alternatives on the phone. The full step-by-step guide is what to do when a pipe bursts.
Then turn off the hot water cylinder at the switchboard if the burst is anywhere near it, and move valuables and electrical items away from the water.
Why pipes burst in Auckland homes
Polybutylene grey pipe
Polybutylene was widely used in New Zealand homes from the 1980s into the early 2000s, so a large share of Auckland houses from that period still have it. It and its fittings are prone to sudden failure, and a failure usually shows up as water through a ceiling or a wet carpet rather than a slow drip. After a grey pipe fitting lets go, the plumber repairs the failure and shows you how much of the house is still on grey pipe. More on identifying it is in the polybutylene grey pipe guide.
Galvanised steel in villas and state houses
Villas and bungalows in Grey Lynn, Ponsonby, Mount Eden and Devonport, and state houses in Mount Albert, Te Atatū, Ōtāhuhu and Māngere, were originally plumbed in galvanised steel. After many decades the pipe rusts from the inside, narrows and finally splits at a thread or elbow. Renovations have often joined copper or plastic onto the old galvanised, and those joints are common failure points. A burst in galvanised is rarely a one-off, so replacing the whole affected run in PEX or copper while the wall or floor is open is usually the better value.
Flexi hoses in apartments and townhouses
Braided flexi hoses under sinks, vanities and toilets fail quietly and then all at once. In the apartments of the CBD, Newmarket and Onehunga, and the terraces of Albany, Takanini and Flat Bush, a split hose runs at mains pressure into the floor framing or the unit below. Replacement hoses should be good quality and paired with an isolating valve you can reach.
Moving ground under the section
The North Shore and West Auckland sit largely on Waitematā clay that swells and shrinks, and on sloping sections it can move after heavy rain. That movement cracks rigid pipe and pulls joints apart between the toby and the house. A soggy strip of lawn, water bubbling up through a path, or a meter that keeps turning when nothing is on are the clues. Leak detection finds these without digging up the whole section.
How a burst pipe is repaired
The plumber first confirms the water is isolated, then finds the actual failure, which is often some distance from where the water shows up. Moisture readings and a pressure test narrow it down before any lining or floor is cut. The repair is explained and quoted before work starts. The failed section is cut out and replaced, the water is turned back on, and the system is checked under pressure. If mains pressure is high enough to keep breaking fittings, a pressure-limiting valve is recommended.
The plumber is authorised by the Plumbers, Gasfitters and Drainlayers Board, carries the PGDB photo ID card, and can be checked on the public register. Photos and a written report of the failed section are provided, which help with an insurance or body corporate claim.
When it is not an emergency
A small weep at a tap connection that you can isolate with the valve under the basin, or a drip you can catch in a bucket, can usually wait for a daytime booking. Anything that is still running after you have closed the nearest valve, or anything coming through a ceiling, is worth a call to the 24 hour emergency plumber now.
