Brett Martin Marlon CST

The Brett Martin Marlon CST is a Big 6 profile corrugated **multiwall polycarbonate roofing sheet**, purpose-built as a direct replacement for ageing fibre cement and asbestos Big 6 roof sheets. Its multiwall construction combines the strength and impact resistance of standard corrugated polycarbonate with an internal air-cell structure that adds thermal insulation and extra rigidity — making it a strong choice for barns, agricultural buildings, cow sheds, industrial units, and general commercial roofing and cladding.

Every sheet is co-extruded with a UV-resistant outer layer, protecting the polycarbonate against long-term weathering, yellowing, and loss of clarity from sun exposure. The sheets are also available in a **Heatguard** finish, using an advanced heat-reflective pigment that lets high levels of natural daylight into the building while significantly cutting solar heat gain — ideal for livestock housing and workspaces where overheating is a concern.

Key Features

• Big 6 profile — matches and directly replaces existing fibre cement/asbestos Big 6 corrugated roofing

• Multiwall construction — added thermal insulation and structural rigidity versus single-skin corrugated sheet

• Co-extruded UV protection — guards against weathering, discolouration and degradation from sunlight

• Heatguard option available — reflective pigment reduces solar heat transfer while maintaining daylight transmission

• Marlon BioPlus option — lower-carbon version made with bio-circular resin (up to 89% renewable content)

• REACH and RoHS compliant and fully recyclable

• Through-colour construction — cut edges match the sheet surface colour

• Fire tested to recognised standards (contact manufacturer for current certification)

• Suitable for roofing and wall cladding applications

Common Applications

• Agricultural buildings, barns and cow sheds

• Asbestos/fibre cement roof replacement projects

• Industrial and commercial roofing and cladding

• Combination use alongside fibre cement sheeting

Installation & Care Notes

As a thermoplastic, polycarbonate expands and contracts with temperature, so this should be accounted for during installation. Sheets should be stored flat, indoors where possible, with the UV-protected surface clearly marked and facing outward, and covered with an opaque sheet secured against wind, rain and sun until fitted.

Available Sizes

Marlon CST Big 6 corrugated sheets are stocked in a range of lengths, including 1.67m (5ft 6"), 2.44m (8ft), and 3.05m (10ft), in both Clear and Heatguard finishes.

FAQs 

What is Brett Martin Marlon CST used for? It's used as roofing and wall cladding for agricultural, industrial and commercial buildings, and is specifically designed to replace old fibre cement or asbestos Big 6 profile roof sheets.

Is Marlon CST UV protected? Yes — it has a co-extruded UV-resistant surface layer to protect against weathering and discolouration over time.

What's the difference between Marlon CST and Marlon CST Heatguard? Heatguard uses a heat-reflective pigment to reduce solar heat transfer into the building while still allowing high daylight transmission; standard Clear sheets do not have this reflective property.