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Guides

Steel guides & how-tos.

Straight-up answers to the questions we get on the phone every day — patio sizing, painted vs galv, how to measure a gate, what to send your fabricator.

Galvanised C-purlins stacked at Marshall Steel — common patio-frame material

DIY guide

What Size SHS or RHS Do I Need for a Patio Frame?

For a typical 4×3m patio with a Colorbond roof, 75×75×4mm SHS posts and 100×50×4mm RHS beams is a common starting point. Here's how spans, posts and beams stack up.

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Blue-painted SHS stock at Marshall Steel — painted finish steel

Materials guide

Painted vs galvanised steel — which one do you need?

Indoor or short-life jobs — painted. Outdoor, exposed or coastal — galvanised. Here's the full comparison so you spend on the right finish.

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Galvanised round pipe stock at Marshall Steel — gate frame material

How-to

How to measure for a steel gate frame

Measure the opening at top, middle and bottom — use the smallest. Then deduct hinge and latch clearance. Here's the full method.

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DuraGal SHS and RHS sections on the rack at Marshall Steel Burleigh Heads

Materials guide

What's the difference between SHS, RHS and CHS?

SHS is square, RHS is rectangular, CHS is round (pipe). Here's what each one does best and how to choose between them.

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Marshall Steel yardhand cutting steel to length on the coldcut saw

Trade guide

Cut-to-length vs standard lengths — when is each worth it?

Standard 6.0m and 7.5m lengths are cheaper per metre. Cut-to-length costs a small cutting fee but cuts your waste and your truck runs. Here's the break-even.

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Custom-fabricated steel brackets from the Marshall Steel fab shop

How-to

Custom steel fabrication on the Gold Coast — what to send your fabricator

A sketch with dimensions, a photo of the site, a deadline, and whether you need a crane. That's it. Here's how to put it together.

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Galvanised and black steel pipe compared

Materials guide

Galvanised pipe vs black pipe — what's the difference?

Galvanised for anything outdoor or wet. Black for indoor structural or where you'll weld it. Here's the full comparison.

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Reinforcing mesh sheets stacked at Marshall Steel Burleigh Heads

Materials guide

Reo mesh sizes explained — SL62, SL72, SL82, SL92, F62 and what they mean

The 'SL' is square layout, the 'F' is rectangular layout. The number tells you the bar size and spacing. Here's how to read the codes — and what each mesh is for.

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