Most roofs in Adelaide give plenty of warning before they fail outright. The trick is telling the difference between a fault a roofer can fix in an afternoon and a roof that has reached the end of its working life. This guide walks through what to look for from the street, from inside the ceiling space and inside the rooms, so you can go into a roofer's inspection with a clear picture of what is going on.
Start with the pattern, not the single fault
A broken tile after a storm, a lifted ridge cap or one corroded screw does not mean the roof is finished. Repairs exist for exactly those faults. The signs that matter for replacement are the ones that repeat across the roof, or that show the material itself has worn out.
Ask yourself three questions as you look:
- Is the same problem showing up in many places, not just one?
- Have repairs been done before, only for the problem to come back?
- Is water getting past the roof covering and reaching the timber, ceilings or insulation?
If the answer to two or more is yes, a replacement is worth discussing. If the answer is no to all three, a targeted repair is usually the better spend. Our roof repairs page covers what that kind of job looks like.
What to look for from the ground
You can learn a lot without climbing anything. Stand back across the street, or use binoculars from the yard.
On tiled roofs (concrete or terracotta, very common on the brick and brick veneer homes built across the Adelaide Plains from the fifties to the eighties):
- Tiles that look patchy, flaky or eroded on the surface, especially older concrete tiles that have lost their coating
- Many cracked, slipped or mismatched tiles, which suggests years of patching
- Ridge capping with gaps, cracked bedding or pointing falling out in chunks
- Moss and lichen thick enough to hold water against the tiles
On metal roofs (galvanised iron on older villas and bungalows, Zincalume or Colorbond on newer homes):
- Rust that has spread from the laps and fixings into the body of the sheet
- Brown streaks running down from screws and nails
- Sheets that lift, flap or rattle in wind
- Gutters and valleys rusted through, which often means the sheet ends above them are going the same way
On any roof, a wavy or dipping ridge line, or a roof plane that is no longer flat, needs a closer look. We cover that separately in our guide to what a sagging roof means.
What the ceiling space tells you
The underside of the roof often tells a clearer story than the top. On a dry day, with a good torch and sturdy footing on the ceiling joists (never on the plasterboard), look for:
- Water stains or dark tide marks on rafters, battens or the top of the ceiling sheets
- Daylight showing through gaps between tiles or through holes in sheeting
- Soft, crumbly or blackened timber, which points to long-term moisture
- Rust on the underside of metal sheets, which usually means corrosion is further along than it looks from outside
- Damp, flattened or stained insulation
If you find old stains but no current moisture, a past leak may already have been fixed. Fresh stains after rain, or several stained areas, are a stronger signal.
Signs inside the house
Inside the rooms, watch for brown rings or bubbling paint on ceilings, cracked or drooping plasterboard, musty smells in a particular room after wet weather, and mould spotting near the cornices. Cracked cornices on their own are often caused by the reactive clay soils under much of Adelaide moving the walls through the seasons rather than by the roof, so look for water marks before blaming the roof.
Signs grouped by what they usually mean
| What you see | What it often points to | Usual next step |
|---|---|---|
| One or two cracked tiles, one leak | Local damage | Repair |
| Pointing cracked along the ridges | Ageing bedding and pointing | Rebed and repoint |
| Tiles eroding and porous across the roof | Material near end of life | Discuss replacement |
| Rust through sheets in many places | Corrosion beyond patching | Discuss replacement |
| Leaks returning after several repairs | Underlying failure | Discuss replacement |
| Wet or rotten battens and rafters | Water reaching structure | Inspection, often replacement |
| Fibro or Super Six sheeting cracking | Ageing asbestos cement | Licensed advice before anything else |
A special case: older fibro roofs
Many post-war houses, sheds, garages and carports around Adelaide have corrugated asbestos cement roofs, often the wide Super Six profile. If yours is cracked, brittle or covered in lichen, do not walk on it, clean it or drill it. Read our guide on how to tell if your roof is asbestos first. SafeWork SA sets out when a licensed removalist is required, so check with them, and a roofer can plan the replacement around that work.
Why age alone is not the answer
People often ask for a number. The honest answer is that age is a prompt to inspect, not a verdict. A well-pointed concrete tile roof in a sheltered spot may have decades left, while galvanised iron within reach of salt air from the gulf can corrode much sooner. Strong summer UV breaks down sealants, flashings and coatings, and the big winter rains between roughly May and September are when weak spots show themselves.
Treat the age of the roof as a reason to book an inspection, then let the condition decide.
Problems that are easy to mistake for a failing roof
Some faults look like roof failure but are not:
- Overflowing gutters can push water back under the roof edge and into the eaves.
- Blocked downpipes cause the same symptoms.
- Condensation under metal roofs without sarking can drip and stain ceilings in cool weather.
- Penetrations for solar panels, aerials, flues or skylights can leak through a poor seal.
A good roofer will check these before recommending a new roof. If one of them is the cause, a repair is the answer.
When to get the roof inspected
Book an inspection if you notice any of the signs above, after a severe thunderstorm with hail or damaging winds, before you buy a house, or before you install or upgrade solar panels. That last one matters: if the roof is close to replacement, it is far simpler to re-roof first than to remove and reinstall a solar array a few years later.
Ask the roofer for photos and a written view on whether to repair or replace. If replacement is the answer, our guide on questions to ask a roof replacement contractor will help you compare quotes, and our roof replacement cost guide explains what drives the price. We ask the contractors we work with to hold the licences and insurance the job needs, and you are welcome to ask to see them before work starts. You can check a builder's licence on the Consumer and Business Services (CBS) public register.
Getting a second opinion
If one roofer says repair and another says replace, ask each to show you the evidence: photos of the battens, the rust, the tile surface or the leak path. Recommendations that are backed by what is actually on the roof are easier to trust. When you are ready, contact us and we will put you in touch with a local roofer for an inspection and quote on re-roofing.