90° external corner — vertical layout of GS MW S/CH panels (variant I)

Junction function

90° external corner = the most common wall detail in industrial halls — the meeting point of two perpendicular façade walls. In the vertical layout, GS MW S/CH panels of each wall terminate at the corner column, with the gap between panels and column filled with mineral wool.

Geometry:

1. Corner column (item 02) — steel or reinforced concrete structural element transferring loads from both walls.
2. Vertical panels (item 01) of each wall terminate at the column with a ~30-50 mm gap.
3. Mineral wool (item 06) fills the cavity between the panels and the column.
4. OB-03 flashing (item 03) externally conceals the joint and provides a clean visual edge; typical width 250-300 mm.
5. OB-02 flashing (item 04) conceals the joint similarly on the inside.

Critical installation aspects

• OB-03 (external) fixed with rivets / sheet-metal screws every 200-300 mm; joint with panel sealed using neutral silicone + PES tape (item 05).
• Mineral wool (item 06) is critical — it eliminates the thermal bridge at the corner (where a steel column with λ ≈ 50 W/m·K would otherwise be in direct contact with the wool insulation); without wool, the corner becomes a condensation point in winter.
• Wind edge zone — within 3 m of the corner, wind suction is significantly higher; fastener density should be increased by 50% in both walls (per PN-EN 1991-1-4 zone C).
• OB-03 + OB-02 jointing — at the 90° corner the flashings meet; do not attempt to butt-joint them (the geometry does not align), leave a 3 mm chamfer sealed with silicone.
• Mineral wool compression — pack it without excessive compression (max 20% of original volume); over-compression degrades the wool’s λ and weakens its elasticity (the wool will not rebound after vibrations).

Used in typical hall walls with vertical layout of GS MW S and GS MW CH panels.

Documentation

Technical Catalogue GS MW S/CH/U (Gór-Stal 2025), page 17 — External corner 90°, vertical layout, Variant I. Scale 1:5.

Components in this junction