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Metal Roofs — The Most Common Australian Solar Substrate
Corrugated iron, Colorbond, and Zincalume are the dominant roof types in regional and rural Australia. They present specific considerations for solar installation: the thin-gauge sheet metal cannot support point loads, roof profile clamps avoid penetrations, and corrosion between dissimilar metals is a long-term risk.
Clamp-on Fixing Systems for Metal Roofs
The preferred fixing method for Colorbond and Zincalume is a rib-mount clamp that grips the raised rib of the corrugated profile without penetrating the sheet. This preserves the roof's weatherproofing and corrosion protection.
Rib clamps must be rated for the calculated uplift force at each fixing point
Clamp material: anodised aluminium on Colorbond is compatible. Stainless steel on Colorbond is acceptable. Bare aluminium on Zincalume can cause galvanic corrosion at the contact point — use a bimetallic washer or rubber pad to isolate
On corrugated iron (bare steel), any aluminium component must be isolated from the steel to prevent galvanic corrosion — use rubber washers or stainless steel only
Galvanic Compatibility Chart for Solar Fixings
Fixing Material | Colorbond/Zincalume | Bare Steel (corrugated iron) | Terracotta Tile |
|---|---|---|---|
Stainless steel (304/316) | ✓ Compatible | ✓ Compatible (slight galvanic risk — isolate in coastal) | ✓ Compatible |
Anodised aluminium | ✓ Compatible | ✗ Isolate required | ✓ Compatible |
Bare aluminium | ✗ Isolate required | ✗ Isolate required | ✓ Compatible |
Hot-dip galvanised steel | ✓ Compatible | ✓ Compatible | ✓ Compatible |
Roof Warranty Implications
Colorbond and Zincalume roofs carry manufacturer warranties (typically 25–36 years for BlueScope products) that are voided by installations that damage the coating or introduce incompatible metals. Always verify fixing methods and materials against the roof manufacturer's technical guidelines — BlueScope publishes specific guidelines for solar installations on their products.
Engr. Jason Morales — Founder, SolarEnergyPH