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Roofing & Cladding · Steel Profile Sheets

Alu-Zinc Profile Sheets

AZ150 – AZ275 aluminium-zinc coated profile sheets for roofs and cladding with extended corrosion resistance.

Category: Roofing & Cladding
Group: Steel Profile Sheets
Market: United Arab Emirates
Supply: Quotation per enquiry

Product overview

Alu-Zinc Profile Sheets: overview and uses

Alu-zinc (aluminium-zinc, also sold as Galvalume or Zincalume) profile sheet is steel coated with an alloy of about 55 % aluminium, 43.4 % zinc and 1.6 % silicon. The alloy combines the barrier protection of aluminium with the sacrificial protection of zinc and is used for roofs and cladding that need longer exterior life than plain galvanized sheet.

The 55 % aluminium-zinc coating forms a stable aluminium oxide surface that corrodes much more slowly than pure zinc, while the zinc-rich phases still protect cut edges. The sheet keeps a bright spangled appearance and reflects more heat than galvanized steel.

OGB supplies alu-zinc sheets in the same profiles and gauges as galvanized sheet, so the two can be swapped on the same purlin layout where the specification calls for higher durability.

Characteristics

Why Alu-Zinc Sheets works in the UAE

AZ150 – AZ275

Coating mass selected for exposure; the alloy outlasts equal-mass zinc in most atmospheres.

Heat reflective

Bright spangle reflects solar radiation, lowering roof surface temperature.

Same profiles

Rolled to the standard trapezoidal and corrugated profiles.

In the field

Alu-Zinc Sheets on site

Alu-zinc profile sheets installed on a roof

Technical data

Specifications

Share your required size, quantity and finish in the enquiry form and OGB confirms availability in writing.

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Alu-Zinc Profile Sheets specifications
Coating	55 % Al – 43.4 % Zn – 1.6 % Si alloy, AZ150 – AZ275 g/m²
Thickness range	0.3 mm – 1.2 mm
Cover width	600 mm – 1250 mm
Length	Up to 12 m cut to length
Profiles	Trapezoidal, corrugated
Standards	ASTM A792, EN 10346, IS 15961
Finish	Bare spangled, anti-finger-print resin, or pre-painted

Available options

Pre-painted alu-zinc (PPAZ) in RAL colours
Matching flashings and accessories
Anti-finger-print passivation

Questions

Alu-Zinc Profile Sheets: common questions

Is alu-zinc better than galvanized sheet?

For bare exterior exposure, an alu-zinc coating of equal mass generally lasts longer than a zinc coating because aluminium oxide is more stable. Galvanized sheet remains preferred where cut edges and scratches are frequent, where the sheet will be welded, or where cost is the priority.

Can alu-zinc sheet be used with concrete or mortar?

Direct contact with wet concrete, mortar or lead should be avoided because the aluminium in the coating reacts with alkalis. Use a separating membrane or paint the contact area.

Does OGB stock Galvalume and Zincalume?

Galvalume and Zincalume are brand names for the same 55 % aluminium-zinc coating. OGB quotes alu-zinc sheet against the coating mass (for example AZ150) rather than a brand.

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