Solar on different roof types in Perth: tile, metal, flat, and heritage roofs

Solar can go on almost every roof type in Perth: clay and concrete tiles, Colorbond steel, flat concrete or membrane decks, even older fibro cement. The panels themselves don't change. What changes is how they're fixed down, how much it costs, and how much extra care the job needs.

Tile and Colorbond roofs are the easiest path: both use standard mounting hardware and most installers quote them without a second thought. Flat roofs need tilt frames or ballasted racking to work properly. Fibro and asbestos cement roofs need a licensed asbestos assessor involved before anyone touches a drill. Heritage-listed homes in Fremantle and inner Perth may face council rules on where panels can go. The sections below cover each roof type in turn, with a link to the full guide if you want the deeper detail.

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How is solar mounted on clay and concrete tile roofs?

Most Perth homes built from the 2000s onward have concrete Monier-style tiles, and older homes carry clay terracotta tiles. Both are the standard roof for Perth solar and installers work with them constantly.

Mounting method. Installers use a hook-and-clamp system: each tile is lifted individually, a bracket is screwed to the rafter underneath, the tile goes back down over it, and the bracket pokes up through the tile line. Rails clip onto the brackets, and panels clamp to the rails.

What can go wrong:

• Cracked tiles. A normal risk on clay tiles especially, which get brittle after 20-plus years. Most installers include tile replacement in their quote if breakage happens during the job, but confirm that before you sign.
• Mortar-bedded hip and ridge tiles. Harder to work around. Installers route the array to avoid these where they can.
• Concrete versus clay. Concrete tiles hold up better during installation. Old terracotta needs a more careful hand.

Weight. Panels add a modest extra load to a tile roof. Tile roofs already carry significant weight on their own, so most residential roof structures handle solar without issue. If your roof is older or was built to an unusual design, ask your installer for a structural check before you commit.

For the full breakdown of tile types, cost, and installer selection, see our guide to solar on tile roofs in Perth.

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How is solar mounted on Colorbond and Zincalume steel roofs?

Corrugated and standing-seam Colorbond went up across Perth through the 1970s to 1990s and is still the default on new builds. Metal roofing is fast and clean to install on.

Mounting method:

• Corrugated iron and Colorbond: brackets clip to the ridges of the corrugation without penetrating the sheet, or use self-tapping screws with sealed washers.
• Standing-seam (klip-lok): specialised clamps grip the seam itself. No holes, no sealant, no penetration at all. This is the cleanest mounting method of any roof type.

What can go wrong:

• Roof age. A Colorbond roof from the 1970s or 1980s reaching the end of its service life is worth re-roofing before solar goes on, not after. Taking panels off to re-roof later costs more than doing both together.
• Roof pitch. Very low-pitch Colorbond, 5 degrees or less, may need tilt frames to drain properly.

Weight. Metal roofing is lighter than tile, so the panel load matters proportionally more, but most residential structures still carry it without concern.

For a full walkthrough of mounting types and what to ask your installer, see our guide to solar on Colorbond roofs in Perth. Older homes with plain corrugated iron rather than painted Colorbond face a few extra questions of their own, covered in our guide to solar on corrugated iron roofs in Perth.

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How does solar work on a flat roof?

Flat concrete decks and low-pitch bitumen or membrane roofs turn up on older Perth commercial buildings and inner-city renovations around Fremantle and the Perth CBD fringe.

Flat-roof systems use one of two mounting approaches:

1. Ballasted mounting. Aluminium or steel frames weighted down with concrete blocks, with no roof penetration. The blocks anchor the frame against wind lift. This is the go-to where the roof's waterproofing can't be touched.
2. Penetrating mounting with flashing. Structural fixings through the membrane, sealed with flashings. Sits lower on the roof but needs careful waterproofing to avoid leaks.

Tilt frames. Flat-roof systems almost always sit on tilt frames, typically 10 to 15 degrees, so rain can rinse dust and pollen off the panels during Perth's dry stretches. A north-facing array tilted at 10 degrees generates about 4.4% less than the same array at Perth's 30-degree optimum; at 15 degrees the gap narrows to about 2.5%. Either beats a flat, horizontal panel by a wide margin, which loses far more to soiling and a poor sun angle. Orientation matters just as much as tilt angle: our guide to solar panel orientation in Perth covers which direction to face an array and why north wins in this hemisphere.

Access. Cleaning and maintenance is usually easier on a flat roof: safer access from within the roof space or off a parapet, rather than up a ladder onto a pitch.

Weight. Ballasted systems add real weight to the roof structure. A structural engineer's assessment is typically required for commercial flat roofs and some residential ones too.

For cost ranges and racking options in more depth, see our guide to solar on flat roofs in Perth.

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Can I install solar on an asbestos or fibro roof in Perth?

Fibro, or asbestos cement sheeting, was widely used on Perth homes built between the 1940s and 1980s. It contains chrysotile asbestos and is a regulated hazard, not just an old-fashioned material.

The rule that matters: solar on an asbestos cement roof needs a licensed asbestos assessor or removal professional involved from the start. Any work that disturbs the sheet, including drilling for panel fixings or even lifting a sheet to inspect it, can release asbestos fibres. That's a genuine health risk, for the installer and for your household.

Your two options:

1. Remove and replace, then install solar. Licensed asbestos removal, a re-roof in Colorbond or tiles, then solar. This is usually the path installers recommend.
2. Zero-penetration mounting on the existing roof. Some installers offer ballasted systems that avoid drilling into the asbestos sheet. It's complex on a pitched fibro roof and rarely the first option offered.

Don't move ahead with solar on a fibro roof until you've talked through the asbestos management plan with your installer. A reputable installer asks for an asbestos assessment before they'll quote.

For the full picture on cost, timing, and finding a qualified assessor, see our guide to solar on asbestos and fibro roofs in Perth.

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Does a heritage listing affect where solar panels can go?

In Fremantle and inner Perth, heritage-listed and character-zone properties can carry planning restrictions on how visible panels are from the street. Fremantle City Council, City of Perth, and the Town of Victoria Park each run their own guidelines, and some zones restrict panels to rear-facing roof slopes only.

Check with your local council's planning department before you install if your property sits in a heritage or character zone. It's a conversation worth having before your installer books the job, not after.

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Should I re-roof before or after installing solar?

If your roof is nearing the end of its working life, deal with that before solar goes on, whatever the roof type. Taking panels off and putting them back on to re-roof later adds cost and delay you'd otherwise avoid.

Concrete and clay tile roofs tend to be long-lived. Colorbond's lifespan varies more, since gauge and coastal exposure both affect how fast it corrodes. Rather than work off a rule of thumb, ask a roofer to assess how much life is left in your specific roof, then bring that into the solar conversation. If a re-roof looks likely within the next decade, ask your solar installer and your roofer for a combined quote so you're comparing one true cost, not two separate ones that don't account for each other.

Our guide to roof age and solar timing in Perth walks through how to weigh that decision, including when it makes sense to re-roof first.

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Asbestos management requirements are regulated under WA's Occupational Safety and Health Act and the Asbestos Regulations. Only licensed contractors should carry out work on asbestos materials. Heritage planning requirements vary by local council.