Wall junction — vertical GS MW S/CH panel layout

Junction function

Wall junction = detail where the sandwich panel façade meets a structural wall (reinforced concrete, brick, aerated concrete). Typical scenarios:

• Fire wall REI 60-120 dividing the hall into fire compartments.
• Existing wall during hall extension (new section in panels + old in masonry).
• Administrative block adjacent to hall — office front in masonry, production section in sandwich panels.
• Service corridor with wall separating hall from warehouse.

Construction:

1. Wall (item 02) existing or built in shell condition.
2. GS MW panels (item 01) reach the wall maintaining a 30-50 mm gap.
3. Mineral wool (item 06) fills the gap.
4. OB-07 internal corner (item 04) seals the geometry.
5. OB-19 cover flashing (item 03) cosmetically conceals the joint.

Critical installation aspects

• Mineral wool in the gap — critical for fire safety: when the wall is to be fire-resistant, the wool in the gap must be class A1 (e.g. stone wool with density 80-120 kg/m³); standard wool has a lower class.
• OB-07 + OB-19 — flashings fixed to the wall (expansion plugs) and panel (self-drilling fasteners); lack of a flexible connection may cause joint cracking due to building movement.
• Wall waterproofing on the external side (usually bitumen felt or Bibrol) must terminate BEHIND the OB-19 cover flashing — without this, capillary water penetrates behind the panels.
• Verification of wall geometry in shell condition — deviation >5 mm/m requires adjustment of gap width or an oversized OB-19 trim strip (wider by the tolerance).
• Thermal movement — masonry has a low expansion coefficient (~10·10⁻⁶/K), sandwich panels higher (~13·10⁻⁶/K in steel facing); the expansion gap is not rigidly fixed = mineral wool acts as flexible infill.

Occurs in specific dividing-wall systems of extended buildings or structurally mixed facilities.

Documentation

Technical Catalogue GS MW S/CH/U (Gór-Stal 2025), page 19 — Wall junction, vertical layout. Scale 1:5.

Components in this junction