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GreenCoat® S280 Snaplock® Seam
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Suitable for commercial roofing applications.


The Snaplock® seam system is extensively used in Europe and the United States of America, where the system has proved itself in the extremely varied climate. The system gives an aesthetically pleasing finish whilst avoiding the industrial finishes found in other seam systems.

Features and benefits:

  • Manufactured from robust, commercial grade steel.
  • Harder wearing, flatter panel than GreenCoat® PLX.
  • Ultraviolet (UV) light and scratch resistant.
  • Seams are available in 25 or 38 mm formats.
  • GreenCoat® colour coated steel products from SSAB Swedish Steel use Swedish rapeseed oil in the coating, producing a sustainable colour coated steel for exterior buildings. The patented BT coatings (Bio-based Technology) offer environmental advantages (100% recyclable) and increased performance.
  • The Snaplock® seam system can be laid on a ventilated timber substrate, composite panel or direct on insulation, using special warm roof fixing clips.
  • Snaplock® is much simpler and requires less skill/ hand tools than the traditional standing seam. The profile contains an undercloak and an overcloak – the undercloak side is fixed with a stainless steel fixing clip with the overcloak side then snapped into place.
  • The system can be provided as a complete roof kit including all flashing, matching rainwater products and ancillaries.
  • Also available in GreenCoat® PLX lightweight corrosion resistant steel.


Snaplock® can be mounted on all roof build-ups, the only pre-requisite being that it is fully supported. Suitable substructure materials:

  • Ventilated 18 mm-thick weather and boil proof (WPB) plywood.
  • Ventilated oriented strand board OSB3.
  • Hard metal board.
  • Composite panel.
  • Rigid insulation.


ISO-Mat Pro® underlay is recommended by the manufacturer depending upon the application.


  • 25 mm seam: SM-EH-Snap-25 (SM-EDH-Snap-25 for fixing to rigid insulation).
  • 38 mm seam: SM-EH-Snap-38 (SM-EDH-Snap-38 for fixing to rigid insulation).
  • Flashing clips: SM-ELH-27.

General information



Uniclass 2015

Pr_25_71_51_15 Carbon steel sheetsPrimary


H31/10 Metal

H31/120 Metal

Specification data - Carbon steel sheets Enhanced data




Insert requirements. The maximum panel lengths for factory produced panels is 12 m. Alternative (bespoke) lengths are available, if they are logistically possible to transport. Consult manufacturer for details.



425 mm (25 mm seam).

Insert project requirements, maximum length: 12 m.




Mountain Grey RR23 / SS0036.

Nordic Night Black RR33 / SS0015.

Quarry Grey RR287 / SS0244.

Special order.

Other colours are available subject to minimum order quantities; consult manufacturer for details.

Product Reference

GreenCoat® S280 Snaplock® Seam


25 mm.

Minimum pitch: 7°. Nominal centres: 425 mm.

Coefficient of thermal expansion

0.012 mm/m·K.

Offers an approximately 50% lower expansion coefficient in contrast to all other metals. This property allows for longer profiles/sections (consult technical literature for details) and prevents buckling and deformation for many decades.

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