insPIRe® S 40 mm panel fastening — section A-A and B-B

Junction function

insPIRe® S 40 mm fastening = identical logic as in thicker S panels (60–120 mm), but with additional limitations:

• 40 mm is the borderline thickness for typical self-drilling fasteners — a short fastener is required.
• No aluminium facing beneath the steel sheet — the fastener engages directly with the PIR core.
• Lower structural load capacity vs. thicker panels — requires precise purlin spacing (max 3.5 m).

Critical installation aspects

• Minimum 3 fasteners across the 1000 mm width — unlike in thicker S panels, in S 40 mm this is an absolute minimum (lower than the requirement in S 60+).
• Tightening torque 6–10 Nm — lower than in thicker panels (excessive torque will dent the facing sheet into the PIR layer).
• Fastener visible at the centre of the joint — critical for maintaining the geometry of the PUS gasket.
• EPDM or aluminium cap — absolutely required (without it the steel head corrodes within 5–10 years).
• Edge zone — within a 3 m strip from the building corner, fastener density is increased by 50%.

Documentation

Technical Catalogue insPIRe S/U + GS PIR D (Gór-Stal 2025), page 12 — Fastening of S panels 40 mm thick — section A-A and B-B. Scale 1:5.

Components in this junction