UNILOK® is developed with wider cover width (3 pans) for longer span, more economical and faster to install. Its deep rigid interlocking ribs with concealed clips allow low pitch roof construction, better weather resistance and clean roof lines without exposed fasteners.


Schematic Unilok

Roofing Profile

Unilok - ME


  • Concealed fix roofing.
  • 3 pans wide cover.
  • Ideal for low pitch roof.
  • Single length roof up to 100m
  • Clips are regularly tested (negative load testing)
  • Site forming available.

note: all measurements are nominal only and are dependent on thickness and tensile strength of material used.

Material Choices:

  • ZINCALUME steel AZ150 G550
  • Clean COLORBOND ULTRA MATT* steel AZ200 G550
  • Clean COLORBOND THERMATECH steel AZ150 G550
  • Clean COLORBOND CAPERO steel AZ150 G550
  • PRIMA-R MAJU* AZ100 G550


Effective width: 672mm
Ribs height: 41mm
Sprung curve: Minimum radius 45m.
Maximum length: 12m. (Ex-factory)
Site forming: Available

Length: +/- 10mm
Cover width: +/- 4mm

How to specify UGI Steel Roofing System:

  • 0.48mm TCT UGI UNILOK Clean COLORBOND with AZ150 G550 metal roofing with all necessary fixing accessories.
  • 1 layer UGI double sided sisalation aluminium foil.
  • 1 layer ROCKWOOL MPB 100 – 50mm thickness @ 40 kg/m³.
  • 1 layer of UGI GI roof mesh.

Physical Properties

Spanning Table


ZINCALUME® steel, AZ150 G550

ZINCALUME® steel is a high-tensile G550 steel with a minimum yield strength of 550Mpa and a metallic coating with composition of 43.5% zinc, 55% aluminium & 1.5% silicon (AZ150) which conforms to Australian Standard AS1397 and Malaysian Standard MS1196. The practical and aesthetic merits of ZINCALUME® steel include durability, longer lasting life, formability and excellent corrosion resistance. Thus ZINCALUME® steel is able to last up to 4 times longer than galvanized steel (GI) and pre-painted galvanized steel (PPGI). ZINCALUME® steel supplied by BlueScope Steel (Malaysia) Sdn Bhd has a clear resin coating which gives it a beautiful, satin-smooth finish.

Clean COLORBOND® steel, AZ150 G550

Clean COLORBOND® is the pre-painted ZINCALUME® steel with the ability to prevent tropical dirt staining and better colour retention. Clean COLORBOND® paint system is oven cured with nominal gloss of 25% which conforms to Australian Standard AS2728 Category 3. It is certified to BOMBA Class ‘O’ (AS1530) with heat resistance up to 100° C.

Other Materials

Other materials are also available upon request;

  • Clean COLORBOND® ULTRA AZ200 G550 steel.
  • Clean COLORBOND® XPD Pearlescent AZ150 G550 steel.
  • PrimaMaju AZ100 G550 steel.

Quality Control

With the certification of MS/ISO 9001: 2008 Quality Management System, UGI ensures high quality Clean Colorbond® and Zincalume® steel are precisely cold formed into UNIDEK® steel roofing sheet.

Colour Range


colorbond ultra

colorbond xpd

prima maju


*Minimum of Order (MOQ) is required for non-standard color.