Can I see the mill certificate for the steel on my build?

Yes. We provide the mill certificate along with the engineering certificate at handover. The mill certificate identifies the production batch, the date, the coating spec and the source mill. It's part of your build documentation.

Why don't you offer imported steel as a cheaper option?

Because we'd be the ones called back to fix it in year 12 when the coating fails, and that's not a job we want to be doing. We'd rather not build at the cheap end than build something we don't believe in.

What colour Colorbond should I choose?

Match the existing home roof colour if you want the carport to read as integrated. Choose a complementary tone if you want the carport to read as a distinct addition. All 22 standard colours carry the same warranty, the choice is purely visual. We can show you samples at site visit.

How long does Colorbond actually last?

BlueScope offers manufacturer paint and corrosion warranties on Colorbond, with terms that vary by product (Standard, Matt, Ultra) and environment. We confirm the warranted term for the product going on your build, in writing, before we order. In our experience well-maintained Colorbond installed correctly comfortably outlasts the warranty period.

Perth Carport Co

Materials and engineering

Every carport we build runs on the same materials spec sheet, regardless of size, suburb or design. Australian BlueScope structural steel for posts and beams, Colorbond cladding for the roof, Galintel connection brackets, AS-compliant fasteners. No imported steel, no cheap substitutes, no exceptions.

Materials spec

The same spec sheet on every build

Australian BlueScope structural steel for posts and beams. Colorbond cladding for the roof. Galintel connection brackets. AS-compliant fasteners. No imported steel, no cheap substitutes, no exceptions.

The consistency is about predictable performance over 25+ years in the WA environment, traceable mill certification on every batch, and a warranty chain we can stand behind.

Structural steel

What we build with, every time

Every post, beam, purlin and connection on our carports uses BlueScope steel from the Port Kembla mill. Z275 galvanising spec across the board - heavier than the AS/NZS 1397 minimum and substantially heavier than typical imported coil.

Component	Spec	Standard
Posts (single)	100x100x4mm SHS, hot-dip galvanised Z275	AS/NZS 4600
Posts (tall RV)	150x150x6mm SHS, hot-dip galvanised Z275	AS/NZS 4600
Beams (standard)	200x100x4mm RHS engineered per span	AS/NZS 1163
Beams (long span)	250x150x5mm RHS or C-purlin truss	AS/NZS 1163
Purlins	C150-15 or C200-19 Z200 coated	AS/NZS 1397
Connection brackets	Galintel Z350 or equivalent	AS/NZS 1252
Fasteners	Class 4 stainless or galvanised M16/M20	AS/NZS 1252

Posts (single)

Spec

100x100x4mm SHS, hot-dip galvanised Z275

Standard

AS/NZS 4600

Posts (tall RV)

Spec

150x150x6mm SHS, hot-dip galvanised Z275

Standard

AS/NZS 4600

Beams (standard)

Spec

200x100x4mm RHS engineered per span

Standard

AS/NZS 1163

Beams (long span)

Spec

250x150x5mm RHS or C-purlin truss

Standard

AS/NZS 1163

Purlins

Spec

C150-15 or C200-19 Z200 coated

Standard

AS/NZS 1397

Connection brackets

Spec

Galintel Z350 or equivalent

Standard

AS/NZS 1252

Fasteners

Spec

Class 4 stainless or galvanised M16/M20

Standard

AS/NZS 1252

Mill certificates supplied with the build documentation at handover, traceable to the production batch and the date.

Colorbond cladding

Genuine Colorbond, profile to match the roof pitch

Trimdek for standard skillion and gable pitches. Klip-Lok for low-pitch flat roofs. Same coating spec across the range.

22 colours
Colorbond Standard
22 standard colours, classic finish, BlueScope paint and corrosion warranty. The default specification for most Perth metro builds.
Matt finish
Colorbond Matt
Lower-sheen finish for contemporary designs and architect-driven builds. Slight premium over Standard.
Marine grade
Colorbond Ultra
Specified for severe marine environments where heavier coatings are warranted. Extended manufacturer warranty term.
Heat reflective
Colorbond Coolmax
Heat-reflective white technology for reduced under-roof temperature. Most often specified for flat-roof builds in west-facing aspects.

If your carport has a warranty issue in year 12 and one of the brackets is imported product with no Australian distributor, you've got no path to claim. The chain only works if every link is locally backed.

Why we don't mix imported product into a build

Everything else

Australian-made down to the fasteners

The reason for the all-Aus approach isn't patriotism - it's quality control and warranty alignment.

BlueScope structural steel
Posts, beams, purlins and connection sections from the Port Kembla mill in NSW. Mill certificates traceable to the production batch.
Galintel connection brackets
Z350 or equivalent connection brackets and ties, manufactured in Geelong. Same warranty chain as the BlueScope steel.
Stratco guttering
South-Australian manufactured guttering and downpipes distributed through the WA network. Matches the Colorbond colour range.
AS-rated fasteners
Class 4 stainless or galvanised bolts and screws to the relevant Australian Standard. No imported substitutes on any build.

Engineering response

How we engineer for WA site conditions

Every carport is engineered by a registered WA structural engineer for the actual wind loading and soil conditions of your block. Perth metro sits within Region A under AS/NZS 1170.2; the specific terrain category and topographic factor are confirmed during the engineering pass.

Site condition	What it drives in the spec
Wind loading (AS/NZS 1170.2)	Post size, bracing pattern, footing depth
Soil classification (AS 2870)	Footing footprint, anchor depth, articulation if reactive
Coastal salt exposure	Heavier galvanising spec, stainless fasteners, marine-grade Colorbond where warranted
Attachment to existing structure	Tie-in detailing, flashing, load path through host wall
Roof drainage	Gutter and downpipe sizing, integration with existing stormwater

Wind loading (AS/NZS 1170.2)

What it drives in the spec

Post size, bracing pattern, footing depth

Soil classification (AS 2870)

What it drives in the spec

Footing footprint, anchor depth, articulation if reactive

Coastal salt exposure

What it drives in the spec

Heavier galvanising spec, stainless fasteners, marine-grade Colorbond where warranted

Attachment to existing structure

What it drives in the spec

Tie-in detailing, flashing, load path through host wall

Roof drainage

What it drives in the spec

Gutter and downpipe sizing, integration with existing stormwater

The actual post size, footing depth and bracing spec for your build come out of the engineering report - we don't guess and we don't apply a one-size-fits-all template.

Frequently asked questions

Yes. We provide the mill certificate along with the engineering certificate at handover. The mill certificate identifies the production batch, the date, the coating spec and the source mill. It's part of your build documentation.

Built right, the first time

Aussie steel, lifetime workmanship warranty, Building Permit handled.

Book A Free Quote Call (08) 6186 7493

Materials and engineering

The same spec sheet on every build

What we build with, every time

Genuine Colorbond, profile to match the roof pitch

Colorbond Standard

Colorbond Matt

Colorbond Ultra

Colorbond Coolmax

Australian-made down to the fasteners

BlueScope structural steel

Galintel connection brackets

Stratco guttering

AS-rated fasteners

How we engineer for WA site conditions

Frequently asked questions

Built right, the first time