Direct answer
On most Australian corrugated or trapezoidal metal roofs, modules sit on rails or rail-less clamps that fix through the cladding into purlins. Standing-seam roofs may use non-penetrating seam clamps where the product and warranty allow. The fastener pattern, isolation from dissimilar metals, and sealing method are site-specific.
We will not invent a span table, a pull-out value, or a “this clamp is rated to X kPa.” Those numbers belong to the hardware manufacturer and the designer of record for your wind region.
Why metal roofs dominate some streets
New estates from the Sunshine Coast to the Perth fringe often ship with metal cladding. Sheds, granny flats, and rural sheds almost always do. Queensland’s residential stock is heavy on metal; inner Melbourne and older Adelaide streets still lean tile. The cladding you have is the cladding the crew must design for — not the cladding on a stock photo.
Corrugated profiles, trapezoidal “trimdek-style” sheets, and standing seam are different fixing problems. A clamp that sits correctly on one rib can miss structure on another. Name the profile on the quote.
What a quote should name
- Cladding profile (corrugated, trapezoidal, standing seam, and the colour/finish if the roof warrantor cares).
- Fixing into structure — not only into thin sheet.
- Rail brand/model or a documented rail-less system compatible with the module frame.
- Isolation (to reduce corrosion between aluminium, steel, and fasteners), especially within a few kilometres of the coast — Newcastle, the Gold Coast, Geelong, Fremantle.
- Who warrants the roof weatherproofing after penetration.
- Whether an engineer is in the scope for height, terrain, or a non-standard pitch.
If the line says “tin roof kit,” ask for names. See clamps and rails.
Penetrations and water
A screw through a metal roof is a hole. The hole is manageable when the fastener hits structure, the seal matches the product, and the installer follows the roof manufacturer’s notes. It is not manageable when someone stitches a rail to the crest of a thin sheet and hopes.
After a summer storm in Brisbane or a winter southerly in Adelaide, the first leak conversation is usually “who holds the workmanship warranty?” Put that name on the paperwork before the deposit. The installer checklist is the place.
Standing seam
Some standing-seam products allow non-penetrating clamps that bite the seam. That is only a solution when the clamp is approved for that seam geometry and the roof warrantor agrees. Do not assume a clamp from a 2013 catalogue page still matches a 2026 cladding.
Heritage note
Historic catalogue pages for “Tin Roof Solar Mounting System” are redirected here as education, not as a SKU. We do not stock L-feet. Classic /product/ paths 301 to the mounting hub or to this child guide.
Siblings: tile, flat, packages.
Coastal air, inland heat, and isolation
A metal roof a kilometre from the beach in Newcastle or on the Gold Coast is a corrosion conversation. Aluminium rails, steel cladding, and the wrong fastener coating will show it. Isolation pads and specified coatings belong on the quote. A dark roof in inland New South Wales is a heat conversation for the modules — see panels — and still a penetration conversation for the roof.
Do not let a “standard tin kit” hide those differences. Name the profile. Name the fixing into purlins. Name the weatherproofing warrantor.
After the install
Photograph the array and the penetrations you can see from a safe place. Keep the workmanship warranty with the electrical certificate. If a screw line rusts or a sheet lifts after a summer storm, that is a mounting call, not a module-brand call. See warranties and maintenance.
Siblings: tile, flat, clamps and rails. Parent: hub. Diligence: installers.
Australian site notes
A new-estate metal roof on the Sunshine Coast and a coastal shed in Fremantle share a cladding family and not a fastener schedule. Name the profile. Fix into purlins. Isolate dissimilar metals. Photograph what you can from the ground after commissioning.
Put the method in words on the quote. Then use the installer checklist and the mounting hub. We will not invent a load rating, a hook spacing, or a ballast density for your street. Last reviewed 25 September 2026, general information only.
Quote language you can copy
Name the cladding profile and the purlin fixing. Coastal isolation is not optional near salt air. Photograph penetrations from a safe place after commissioning.
Then return to the hub and put the method in the installer table. General information only — not a span table.
Waterproofing and fastener pattern are the installer’s responsibility. Last reviewed 25 September 2026.