Detail · GS MW

GS MW S 80 mm lock + panel joint

Cross-section of the side lock of a standard GS MW S sandwich panel (mineral wool) 80 mm thick. Tongue-and-groove geometry provides joint tightness at a modular width of 1000/1140 mm. Fastener visible in the lock.

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GS MW S 80 mm lock + panel joint

Junction function

GS MW S 80 mm side lock = the joining geometry of two adjacent sandwich panels with a visible fastener in the lock area. This is the basic sealing mechanism for vertical/horizontal panel seams.

Key features of the S 80 mm lock:

  • Modular width: 1000 mm (standard) or 1140 mm (XL variant).
  • Tongue-and-groove geometry: the lower tongue of one panel enters the upper groove of the adjacent panel; a strip of mineral wool in the lock ensures insulation continuity.
  • Visible fastener — passes through the lock into the purlin, the head covered by an EPDM or aluminium cap.
  • Class 1 tightness acc. to PN-EN 14509 — resistance to air leakage and rainwater penetration.

Critical installation aspects

  • Gap between panels min. 1 mm — required for thermal movement (expansion of steel sheet within the 0–80°C range is ~1 mm/m).
  • PES tape in the lock — self-adhesive polyethylene sealant that eliminates air migration through the geometric gap.
  • Installation sequence — always bottom to top (vertical panels) or from the end support (horizontal panels); reversed order = the lock will not close properly.
  • Production tolerance ±1 mm on width — does not require adjustment on site; when replacing a single panel, check whether the manufacturer accepts the extended module.

Documentation

Technical Catalogue GS MW S/CH/U (Gór-Stal 2025), page 14 — Lock shape and joint detail of GS MW S panels, 80 mm thick. Scale 1:5.

Components in this junction

Panel (1)