Aluminium
Well suited to architectural pergolas, screens and outdoor systems where low weight, clean extrusion profiles and corrosion resistance are useful. Alloy, temper, coating and fixings still need exact-system confirmation.
Decision Centre / Global
Aluminium or steel for an outdoor structure?
Material choice affects far more than appearance. Weight, corrosion strategy, section design, finish, maintenance, freight and exposure should be considered together.
Global / overseas search owner Manual project review Exact-system evidence only
Direct answer
The short version.
Choose aluminium where lower weight, corrosion resistance and architectural finish are priorities. Choose steel where the structural system benefits from steel section behaviour, accepting that corrosion protection and maintenance become more important, especially in coastal or constantly damp environments.
Project decision
What matters before product selection.
Use these points to structure the first project conversation. Final suitability stays tied to the actual site, selected system and local project team.
Steel
Useful where the structure, geometry or fabrication method suits steel. Galvanising, coating, cut-edge protection, drainage and environmental exposure materially affect long-term appearance and maintenance.
Coastal projects
Neither material should be specified by material name alone. Alloy/grade, coating system, stainless fixings, drainage, salt exposure, cleaning and maintenance should be reviewed for the exact site.
Comparison matrix
Material comparison
Early-stage selection only.
| Factor | Aluminium | Steel |
|---|---|---|
| Weight | Lower | Higher |
| Corrosion strategy | Alloy + finish + fixings | Galvanising/coating + detailing |
| Architectural extrusion | Strong fit | Fabricated section dependent |
| Maintenance | Generally lower | Environment/coating dependent |
| Coastal review | Required | Critical |
| Typical Apollo pathway | CADARN / ARKEN / selected roofs | ORZENZA / steel structures |
Project brief
Information worth collecting before quotation.
01Site exposure
02Required span / geometry
03Finish
04Drainage
05Fixings
06Maintenance expectation
07Structural design
08Destination requirements
Frequently asked
Answers without oversimplifying the project.
Is aluminium always better near the coast?
No. It often offers advantages, but alloy, coating, stainless fixings, dissimilar-metal interfaces, cleaning and actual salt exposure still matter.
Can coated steel be used outdoors?
Yes, when the exact corrosion-protection system and maintenance regime suit the exposure. Constant dampness and severe marine conditions need particular care.
Who confirms structural suitability?
Final structural design and local compliance remain project-specific and must be confirmed for the actual system and site.
Next step
Turn the research into a real project brief.
Send the site, dimensions, intended use, quantities and known local requirements. Apollo will review the relevant product pathway and keep local engineering, approvals and site-work responsibilities explicit.