Ridge — insPIRe® D sandwich panel

Junction function

The ridge is the highest point of a dual-pitched roof — where two roof slopes meet at an angle. The junction must perform three functions simultaneously:

• Water tightness — prevent rainwater ingress into the panel joint (water running down both slopes must not seep between the panels).
• Roof space ventilation — typically the ridge is the air outlet point of the ventilated roof space.
• Ridge line aesthetics — clean line with no visible leaks from the façade side.

The system solves this with a two-stage sheet metal flashing: the lower OB-23 closes the panel joint from the roof air side, the upper OB-22 covers the whole from outside and drains water down both slopes.

Critical installation aspects

• Ridge flashing overlap: minimum 50 mm on each side of the ridge line. Smaller overlaps may cause leakage in driving wind conditions.
• PE profiled gasket (item 03) is absolutely required between panels and lower flashing — it fills the toothed geometry of the panel’s trapezoidal profile. Without the gasket — a path for water vapour and air from the hall interior.
• PU installation foam (item 08) fills the internal space between panels at the ridge itself. Use low-expansion foam (expansion ≤ 30%); high-expansion foam may deform the flashing.
• Self-drilling fasteners secure the panels to the structural purlins (item 02). At the ridge, an increased fastener density is required (roof edge zone) — typically 6 pcs/m² vs 3 in the internal zone.
• OB-28 is a profiled flashing that fills the trapezoidal panel profile groove — eliminating the air bridge from the ridge into the panel.

Connection with other flashings

The ridge system has several geometric variants depending on:

• roof pitch (from 3° for very low slopes),
• trapezoidal corrugation height (typically 38 mm for the T profile),
• planned ridge ventilation (with openings in the flashing vs closed).

Appears in the insPIRe® D multi-span pitched roof system.

Documentation

Gór-Stal 2025 Technical Catalogue, p. 88 — detailed cross-section drawing with dimensions.

Components in this junction