Restoration and replacement are different jobs
A restoration keeps the existing roof covering and fixes everything around it that has worn out. A replacement removes the covering, and often the battens, and starts again. Both have their place, and choosing the wrong one wastes money in one direction or the other.
Restoration makes sense when the tiles or sheets themselves are basically sound. Concrete tiles that have lost their surface and grown lichen, ridge capping with cracked mortar, a few broken tiles from a hailstorm, and rusty valley irons are all classic restoration problems. The roof looks tired, it may have the occasional drip, but the structure is fine.
Replacement makes more sense when the problem is the covering or the frame. Our article on roof replacement versus repair goes into that decision in more depth.
What a tile roof restoration involves
On a typical 1960s to 1980s concrete tile roof in the eastern or south-eastern suburbs, a restoration usually follows this order:
- Inspection. The roof is checked tile by tile where practical, along with valleys, flashings, gutters and the roof space.
- Repairs. Cracked and broken tiles are replaced with matching ones, slipped tiles are refixed, and rusted valley irons are replaced.
- Ridge and hip work. Old mortar is removed and caps are re-bedded and re-pointed with a flexible pointing compound. This compound tolerates the slight movement that houses on reactive clay experience as soils swell and shrink.
- Cleaning. The roof is cleaned to remove lichen, moss and dirt, with care taken not to drive water under the tiles.
- Coating, if chosen. Concrete tiles may receive a primer or sealer and topcoats. The coating protects the porous surface and refreshes the colour.
- Gutters and clean-up. Gutters and downpipes are cleared, and debris is removed from the site.
Each stage needs dry weather, and coatings need time to cure, so restorations are best planned for settled stretches rather than mid-winter.
Terracotta and glazed tiles
Terracotta on Californian bungalows and older homes is restored in much the same way, but coating is often unnecessary. Glazed tiles keep their finish, and coating them can trap moisture or create a maintenance burden. Repairs and re-pointing are where the value lies. Unglazed terracotta may sometimes be sealed; ask the contractor why.
What a metal roof restoration involves
Steel roofs can also be restored if the sheets are not rusted through:
- Loose, rusted or missing screws are replaced with suitable fasteners.
- Surface rust is treated and primed.
- Laps, flashings and penetrations are resealed.
- Ridge capping is refixed where it has lifted.
- A coating system suited to the steel is applied, if the paint finish has failed.
Near the bay, salt exposure makes metal restoration trickier, because corrosion often starts under laps and at sheet ends where it cannot be seen. A thorough inspection matters more than ever.
When coating is not worth it
Coatings are the most visible part of a restoration, and sometimes the most oversold. A coating is unlikely to be good value when:
- The tiles are crumbling or highly porous. Paint does not bind failing concrete together.
- Many tiles are cracked. Replacing large numbers of tiles plus coating can approach the cost of a new roof.
- The steel is rusted through. A coating over perforated steel is cosmetic at best.
- Battens or rafters are rotten. No surface treatment fixes a failing frame underneath.
- The tiles are glazed terracotta. They usually do not need it.
- Asbestos cement sheeting is involved. Disturbing it by cleaning or coating raises safety issues; specialist advice is needed.
On that last point, older homes may have asbestos cement roofing, eaves or flues. WorkSafe Victoria regulates its removal; under its rules, removing more than 10 square metres of non-friable asbestos requires a licensed removalist, and EPA Victoria governs disposal. Pressure cleaning an asbestos roof is not something to attempt. See asbestos roof removal and replacement.
Restoration versus replacement at a glance
| Condition | Restoration | Replacement |
|---|---|---|
| Faded, mossy but solid concrete tiles | Good fit | Usually unnecessary |
| Cracked ridge pointing, few broken tiles | Good fit | Unnecessary |
| Many cracked or crumbling tiles | Poor value | Better option |
| Steel with surface rust only | Possible | Optional |
| Steel rusted through or failing laps | Poor value | Better option |
| Rotten battens or sagging frame | Does not address | Needed |
| Wanting a different material | Not possible | Needed |
Melbourne conditions that wear roofs
Several local factors explain why restoration is so common here:
- Shaded southern faces under eucalypts hold moisture, so lichen and moss thrive.
- Leaf litter blocks valleys and gutters, pushing water back under tiles.
- Hot northerly days followed by sudden cool changes stress ridge mortar as it expands and contracts.
- Hail from summer storms cracks tiles and dents flashings.
- Frost in the outer east works water into porous tiles.
Who does what on a restoration
A restoration often involves more than one trade, and it helps to know which parts are regulated. Replacing valley irons, refitting flashings, resealing sheet laps and fixing gutters and downpipes count as roof plumbing in Victoria. Whoever does that work should hold registration or a licence in the roofing (stormwater) class. The Victorian Building Authority used to administer that register; its functions moved to the Building and Plumbing Commission in 2025, so search the current register by name or number. For qualifying plumbing work, the plumber provides a compliance certificate when the job is done.
Cleaning, tile replacement, re-pointing and coating are commonly handled by roof tilers or restoration crews. Ask each contractor which parts of the job they will do themselves and which they will subcontract, and make sure the plumbing component is clearly covered.
If your roof only needs one or two fixes rather than a full restoration, a targeted roof repair may be all that is needed for now.
Getting a fair restoration quote
Ask contractors to separate repairs, re-pointing, cleaning and coating in the quote, so you can see where the money goes and choose whether to coat. Ask how many tiles they expect to replace, what pointing compound they use, and what coating system and how many coats. For relative pricing between restoration and replacement, see our roof replacement price guide.
Roof Repair Melbourne VIC arranges free on-site quotes from independent local contractors, and you can ask for both a restoration and a replacement option on the same visit. We ask contractors to carry the registrations and insurance their work requires; please check them yourself before work begins. If your roof is tiled and you suspect it has reached the end, our tiled roof replacement page explains the alternative.