GS PIR D roof panel fastening to purlins

Junction function

GS PIR D roof panel fastening = fastening to the steel purlin (not to the rail as in walls). The purlin = horizontal structural beam on the roof, perpendicular to the slope.

Features:

• Min. 2 fasteners per panel = minimum for typical roofs (purlin spacing up to 3.5 m).
• Edge zone (3 m from corner) 3+ fasteners for wind pressure/suction.
• Cap washer = special steel washer resistant to condensation (protects the head from corrosion).

Critical installation aspects

• Fasteners through the trapezoid crown (highest point of the profile), NOT through the lower trough (water condensation).
• Cap washer between head and panel seals the penetration; EPDM gasket under the head.
• Tightening torque 8–12 Nm — overtightening will deform the cap washer.
• Inspection after the first winter — check for any point leaks at the heads.

Documentation

Technical Catalogue insPIRe S/U + GS PIR D (Gór-Stal 2025), page 87 — Fastening of D roof panels to purlins. Scale 1:5.

Components in this junction