Solar on tile roofs in Perth: terracotta, concrete, and slate

Yes, solar goes on tile roofs routinely in Perth. Most homes built from the 1980s through the early 2000s have terracotta or concrete tiles, and installers here have fitted thousands of systems onto them. The panels don't sit any differently once they're up: the difference is entirely in how the racking gets attached underneath.

In short:

• Installers use a purpose-built tile mounting bracket that sits under the tiles and bolts to the rafter, not a clamp screwed straight into the roof.
• Cost is broadly similar to a metal roof. Where it shifts is labour time and the risk of a cracked tile, both of which come down to the installer's tile experience.
• Most Perth tile roofs already sit close to the ideal panel pitch, so extra tilt racking usually isn't needed.
• The biggest long-term risk isn't the tiles themselves. It's flashing quality around each mounting point.

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What types of tile roofs do Perth homes have?

Terracotta tiles. Fired clay, reddish-brown or natural terracotta colour. Common on older Perth homes from the 1970s to 1990s. Heavier than concrete, and generally more brittle, particularly on older roofs that have gone through decades of Perth summer heat cycling. A well-maintained terracotta roof holds up well: manufacturers back terracotta tiles with 50-year product warranties, and roofs that get regular upkeep often outlast that.

Concrete tiles. Grey and textured, often painted in slate grey or ochre. More common on 1990s and 2000s Perth tract housing, and lighter than terracotta. Some concrete tiles carry a surface coating that weathers over time, which can make colour-matching harder if a tile gets broken during the install.

Monier tiles. A widely used concrete tile brand in Perth, available in flat, S-curve, and low-pitch profiles. Mounting requirements are well documented, and most Perth solar installers have plenty of experience with Monier roofs specifically.

Slate. Genuine slate is rare in Perth. What you're more likely to see is imitation slate: concrete or fibre cement pressed to look like slate. If your roof is genuinely slate, talk to a specialist roofer before booking a solar install, not just the solar installer.

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How do installers mount solar on tile roofs?

The tile mounting bracket is the piece that makes this work. Installing it goes roughly like this:

1. Locate the roof rafters beneath the tiles.
2. Lift the specific tiles needed, without breaking them.
3. Drill a lag bolt through the sarking and battens into the rafter below.
4. Fit the tile mounting bracket: an aluminium bracket with a flashing flange that tucks under the adjacent tiles.
5. Replace the tiles around the bracket.
6. Attach the railing system to the brackets.
7. Slide the panels onto the railing.

Replacing tiles without cracking them is the skill that separates good tile-roof installers from the rest. Installers who do this often, week in and week out, rarely chip a tile. Less experienced crews sometimes do. It's worth asking a prospective installer directly about their tile-roof track record before you sign.

Flashing is what actually keeps water out. The flashing around each bracket point, not the tile itself, is what stops water getting in. Low-quality or badly fitted flashing is the most common cause of roof leak complaints after a tile solar install. Ask your installer how they waterproof each penetration, and whether they back it with a dedicated roof penetration warranty. What good flashing looks like on a Perth solar install covers this in more depth if you want the full picture before you sign anything.

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Does the age or condition of your tiles matter?

It does, mostly around handling risk rather than whether the install is possible at all.

Older tiles crack more easily. Terracotta tiles past about 30 years old tend to become more brittle from thermal cycling and Perth's UV exposure. Walking on them, and lifting them to fit brackets, carries more risk of a crack. Experienced installers manage this with tile hooks and crawl boards that spread their weight instead of standing directly on individual tiles.

Matching a broken tile isn't always simple. If a tile does break during the install, sourcing a replacement can be difficult for discontinued profiles or colours. Before work starts, it's worth confirming your tile type and checking that replacements are actually available. Installers working on older, hard-to-match roofs will often keep a small stash of lifted tiles spare, just in case.

A weathered surface is cosmetic, not structural. Concrete tiles that have lost their coating tend to look chalky or bleached, and repair paint doesn't always take well on that surface. It won't affect the install or the roof's integrity, but it's worth knowing if you care about how the roof looks afterwards.

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Does a tile roof take longer to install than Colorbond?

Generally, yes. Lifting and replacing tiles around every mounting point takes more care and more time than clamping straight onto Colorbond ribs, where there's nothing to lift at all. SAA-accredited Perth installers who work regularly on tile roofs allow extra time in their quote for exactly this reason, and older terracotta in particular can add to the job. Ask your installer how they've scoped the day for your specific roof: a realistic quote should reflect the tile work, not just the panel count.

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Is your tile roof already at a good pitch for solar?

Probably, and that's one advantage tile roofs have. Perth tile roofs typically sit at a 22.5-30 degree pitch, close to the ideal tilt for this latitude: around 30 degrees is considered optimal for a fixed array at Perth's latitude of approximately 32 degrees south. That means most tile roofs need no extra tilt racking to get near-optimal output.

Orientation still matters more than pitch. North-facing is best, east or west-facing is fine, and south-facing performs poorly here, the same as on any other roof type. If you want the full breakdown of how orientation affects output in Perth, solar panel orientation in Perth walks through it.

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How do you look after a tile roof once solar is installed?

• Stay off the tiles near the racking. The racking changes how weight distributes around the mounting points, so walking on nearby tiles carries a higher crack risk than it would elsewhere on the roof.
• Do an annual visual check. Look at the flashings around each mounting bracket from the ground, binoculars help, and watch for anything lifted or degraded. A lifted flashing edge is a leak waiting to happen.
• Keep the gutters clear. Perth's autumn leaf drop and spring pollen clog gutters fast. A blocked gutter near the racking can back water up under the tiles instead of letting it run off.

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What if you need to re-roof after installing solar?

If your tile roof is likely to need replacing within the next 5 to 10 years, it's worth planning the timing before you install solar, not after.

Removing a solar system to re-roof, then reinstalling it, typically costs $1,500 to $3,000 in Perth. If your roof is already past 25 years old and getting close to the end of its life, replacing the tiles first, before solar goes on, avoids that cost altogether. Roof age and solar panels in Perth covers how to weigh that decision if your roof is getting on in years.

Either way, ask your installer for a tile roof condition assessment as part of the site inspection. It's a quick check that saves a much more expensive surprise later.

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Tile is one of the most common roof types in Perth, and solar goes on it every day without drama. The real differences from a metal roof come down to the tile mounting bracket process and the extra care an installer takes with older or brittle tiles, not whether the job can be done. Ask any installer you're quoting specifically about their tile-roof experience and their waterproofing process; the answer tells you more than the quote does. For the fundamentals that apply across every roof type, the complete Perth solar guide is a good place to start.