Roof to RC wall junction (along the slope)

Junction function

Junction of a GS PIR D sandwich panel roof with a reinforced concrete or masonry wall along the slope — a typical detail for halls with a full-height RC parapet preventing fire spread between segments.

Unlike a classic parapet (where the parapet is part of the panel structure), here the RC wall is an independent structure — it extends above the roof or runs parallel to the roof edge.

The set of four flashings (OB-28, OB-30, OB-12, OB-07) creates a three-layer seal:

• OB-30 slope flashing (item 06) — horizontal flashing on the panel on the wall side.
• OB-28 profiled flashing (item 05) — vertical flashing fixed to the wall.
• OB-12 drip flashing (item 07) — lower water-draining element.
• OB-07 internal corner (item 08) — closes the angle between the wall and the roof plane.

Critical installation aspects

• OB-30 + PES gasket (items 06, 09) on the surface of the roof panel. Strip min. 200 mm wide.
• OB-28 (item 05) fixed to the RC wall with expansion anchors (item 14) every 250 mm. It does NOT touch the roof plane — a ~10 mm gap is filled with butyl (item 11).
• PU foam (item 10) fills the gap between OB-28 and the roof plane — low-expansion type, expansion ≤ 30%.
• OB-12 drip flashing (item 07) at the bottom — bent with a 30 mm drip edge, fixed to OB-30.
• OB-07 internal corner (item 08) — connects OB-30 with OB-28 at the corner, with a 100 mm overlap under both.
• Sandwich panel fasteners (item 12) at double density in a 50 cm strip from the wall — wind suction forces at the lateral roof edge are higher.

Classic parapet vs RC wall

Aspect	Panel parapet (classic)	RC wall (this junction)
Material	GS PIR panel / insulation	reinforced concrete
Height above roof	30-150 cm	100-500 cm (full height)
Fire function	none	typically class EI 120
Number of flashings	OB-28+OB-12 (2)	OB-28+OB-30+OB-12+OB-07 (4)
Price per lm	base	+200% (RC structure)
Application	typical halls	halls requiring fire separation between segments

Used in the pitched roof GS PIR D — multi-span system.

Documentation

Gór-Stal Technical Catalogue 2025, p. 101 — GS PIR D roof junction with RC wall, cross-section along the slope.

Components in this junction