Plinth — GS MW U Sole Beam (horizontal layout)

Junction function

Plinth at sole beam in GS MW U panels (concealed fixing) — start of the façade from the foundation side. It serves three functions:

• Start of the horizontal panel layout — the first panel from the bottom requires an OB-41 starter angle that conceals the panel edge and keeps it vertical.
• Water drainage from the façade — the OB-15 drip flashing directs water running down the façade beyond the plinth line.
• Protection against splash water — the OB-15a stiffener stabilises the drip flashing edge against vibrations from wind and water.

Variant III — for panels 60-100 mm thick. Other variants (I, II, IV) differ in OB-15/15a geometry for thinner or thicker panels.

Critical installation aspects

• Concealed fixing GS MW U — fastener driven through the PM1 fixing washer (item 10) invisibly from the façade side. PM1 eliminates thermal bridges at the fastener.
• OB-41 angle — fixed to the sole beam (item 02) with quick-fix expansion anchors (item 11). The sole beam is typically a steel section or concrete beam.
• OB-15 drip flashing fixed with washer-head fasteners (item 12) or rivets 4.0×8.0 — heads on the façade side aesthetically concealed.
• OB-15a stiffener — additional Z-profile layer under OB-15, eliminates vibrations and wind-induced deformation.
• PURS gasket or assembly foam (item 08) fills the internal space of OB-41 and ensures thermal continuity with the beam insulation.
• Neutral silicone (item 13) on the external joint between OB-15a and the plinth façade — UV- and moisture-resistant.

Horizontal vs vertical layout

Aspect	Horizontal layout (this one)	Vertical layout
Aesthetics	linear horizontal pattern	linear vertical pattern
Panel joints	between storeys	between modules
Plinth	requires OB-41 + OB-15	requires bottom and plinth flashing
Longer panels	yes (typically 8-12 m)	no (max 4-6 m façade height)
Price	baseline	+5-10% (more edges around windows)

Used in the non-combustible GS MW U wall system.

Documentation

GS MW catalogue (Gór-Stal, 2025), p. 60 — variant III of panel fixing at sole beam.

Components in this junction