Ceiling water damage: stains, sagging and what is above it

A ceiling stain is the only water damage symptom that regularly appears weeks after the event that caused it, in a room that does not contain the problem. That makes it the one where diagnosis matters most, because the diagnosis decides which provision applies and therefore which claim you are making.

Before anything else

Working out which claim it is

There are only four things above a ceiling, and each one is a different claim.

If it is the roof

The test is weather. A stain that grows during rain and holds steady between falls is a roof. Which provision then applies turns on one further question, and insurers ask it every time: was the roof damaged by the storm, or was it already failing? Insurance Contracts Regulations 2017 (Cth) reg 19(1)(a)(xiv) names storm and tempest; Insurance Contracts Regulations 2017 (Cth) reg 19(2)(b) takes out wear and tear, rust and corrosion. A roof that has not been looked at in fifteen years invites the second answer.

If it is a bathroom above

The test is use. A stain that grows when the shower upstairs runs, regardless of weather, is plumbing rather than weather. That puts it at Insurance Contracts Regulations 2017 (Cth) reg 19(1)(a)(vi) — but shower membranes fail slowly by their nature, so duration becomes the whole argument. In an apartment this is also the point at which the claim may stop being yours at all: water crossing between a lot and common property routinely produces two claims on two policies.

If it is a pipe in the ceiling space

The test is independence. Constant, unrelated to weather and unrelated to anybody using a fixture, and usually the fastest-growing of the four. Straightforward Insurance Contracts Regulations 2017 (Cth) reg 19(1)(a)(vi) territory — and the one case where getting the water off at the meter immediately is worth more than any photograph.

If it is condensation

The test is season and shape. Diffuse rather than a point, worse in winter, often across a wide area and frequently in a home that has recently been sealed up or had insulation added. This is not an escape of water and never was, so no provision covers it. NSW Health’s list of things that reduce indoor dampness — running exhaust fans when bathing, showering, cooking and drying clothes, opening windows for cross ventilation, limiting unflued gas heating — is the remedy, and repainting is not.

The last row is the one people get wrong and it is worth taking seriously, because it is a building performance problem masquerading as a leak. NSW Health lists limiting unflued gas heating, running exhaust fans and improving cross ventilation among the things that reduce indoor dampness — and a ceiling that is wet from condensation will keep being wet no matter how many times it is repainted.

Why the stain is not above the leak

Water entering a roof space does not fall straight down. It runs along the top of the ceiling sheets, along battens and along the underside of sarking, and it comes through at the lowest point it can find or wherever the sheet has a joint, a cornice line or a light fitting. In a single-storey Australian house with a tiled roof it is entirely normal for the entry point to be five or more metres from the stain, on the other side of a wall.

The practical consequences:

• Do not let anyone tell you where the leak is from the stain alone. A proper diagnosis means getting into the roof space, or a hose test, or thermal imaging.
• Expect the wet area to be bigger than the stain. The visible mark is where it surfaced, not the extent of the saturation.
• Check the insulation. Wet bulk insulation sitting on a ceiling is heavy, it does not dry, and it keeps the plasterboard wet indefinitely. It is also the thing that turns a small leak into a collapsed ceiling.

What is in the cavity decides the bill

A ceiling is not a surface. It is the bottom of a void that contains several things you cannot see, and which of them got wet decides whether this is a repaint or a rebuild.

That last row is NSW Health’s own qualification, and it is the reason a ceiling is the one place where “it looks fine now” is least reliable.

Dried or replaced

Plasterboard can sometimes be dried in place and sometimes cannot. What decides it:

• Has it sagged? A sheet that has deflected has lost integrity. It gets replaced.
• Has the paper facing delaminated or bubbled? Same answer.
• How long has it been wet? A day is different from a fortnight.
• What is the water? Clean roof water and a sewage overflow from an upstairs bathroom are not the same problem and do not get the same answer.
• Is there insulation on top of it? Wet insulation has to come out regardless, which usually means the sheet comes out too.

A restorer who wants to dry it in place will set air movers into the ceiling cavity, often through the manhole or through a small deliberate penetration, and take daily readings. That is the same equipment as any other structural drying job — on the rate card this site reproduces, $69 per carpet dryer per day and $149 per dehumidifier per day, each with a 3-day minimum, excluding GST.

What drying and repairing a ceiling costs

A restorer who intends to dry the cavity rather than open it will set air movers into the void, usually through the manhole or a small deliberate penetration, and take daily readings. That is the same equipment as any other structural drying job, priced the same way — per unit, per day.

Two rooms affected below the cavity, dried over the published 3-day minimum, comes to $1,557 excluding GST on those rates; five days is $2,269. Neither figure includes replacing the sheet, the insulation, or anything above it — the cost page lists what sits outside a drying quote, and has the calculator.

Then the repair. If the sheet sagged, crumbled or stayed stained, it is cut out and replaced. Ceiling businesses and quote sites do publish prices for that — a water-damaged section at about $500 to $2,800 on two of them, a new ceiling at $70 to $130 per square metre on another. Ceiling repair cost puts those published prices side by side, with what each one includes. The general plastering lines are these:

Those are per square metre of board and do not include the electrician to drop and refit light fittings, new insulation, a stain-blocking primer and paint for the whole ceiling, or fixing whatever was leaking above it. A ceiling that only stained and dried firm may need nothing more than sealing and paint. Water damage repair cost sets out walls, floors, bathrooms and kitchens on the same basis, and if the water came through the roof, roof leak cover covers the storm versus wear and tear argument.

Whether your insurer or you carries that depends on which of the four sources it turned out to be, which is the whole of this page. The words your policy uses maps each one onto its provision, and the cover check does it in six questions.

What to have before you lodge

1. Dated photographs of the stain over time. If it grew during a particular storm, that is your storm claim in one image sequence.
2. The weather. Bureau of Meteorology observations for your area on the day. An insurer’s first move on a storm claim is to check whether there was a storm.
3. A tradesperson’s written diagnosis. Roofer or plumber, depending on which of the four it turned out to be. This is the document that puts your claim in the right provision.
4. Photographs of the roof space, if it can be done safely. Wet insulation, a stained batten run and daylight through a roof are all evidence.

Get the diagnosis before you lodge if you can. A ceiling claim lodged as “storm” that turns out to be an upstairs shower has to be recharacterised, and that takes longer than waiting a day.

Common questions