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Metroll Sydney  > Roofing & Cladding >  Metlok 500®

Metlok 500®

Metlok 500® is custom-length, high tensile steel roofing manufactured from .42mm, .48mm and .60mm B.M.T. Surfmist® and Zincalume®. The hidden fixing system makes it one of the most attractive options to roof, or clad any building. Combined with its minimum roof pitch, Metlok 500® is the ideal choice for large roof spans.

With a minimum pitch of 1° and a concealed fixing system, Metlok 500® is the quintessential industrial metal roofing. Make a building look its best without unsightly fasteners, and a nearly flat roof. This can allow more efficient structural design and reduce overall structural steel requirements.


Metroll can supply Metlok 500® sheeting up to a maximum length of 35 meters depending on availability of delivery. Lengths to be manufactured by Metroll should be site measurements, not those taken off plans.


For roofs with continuous sheets and no end laps the minimum roof pitch is 1º (1 to 60). To prevent ponding from occurring this minimum pitch must be adhered to at all points of the roof. For roofs with end laps the minimum lap is 200mm for pitches between 5º and 15º and 150mm above 15º.
For walls allow minimum end laps of 100mm. End laps in roofs of less than 5º should be sealed with a suitable sealant. The sealant should be in two runs; one at the low end of the lap to prevent moisture being drawn in by capillary action. The other should be at the high end of the lap to prevent condensation that may form under the top sheet, from draining down the underside and entering the lap. Sheets should be laid in the opposite direction to the prevailing weather.


  • Low roof pitch
  • Snap lock system
  • Concealed fixing system
  • Good looking profile
  • Cost effective
  • Durable & strong

    Click here to download a Technical Diagram.


    Surfmist® and Zincalume® Only