Eaves with gutter — Variant I — insPIRe® D sandwich panel

Junction function

Eaves with gutter drainage is the most common detail in industrial halls and warehouses — a complete solution for rainwater drainage from a sandwich panel roof. Three functions in parallel:

• Water drainage — water running off the roof slope flows into the gutter via the OB-26 sub-gutter Z-flashing.
• Snow safety — the OB-27 barrier prevents snow avalanches at the eaves (fire-safety requirement for retail and office buildings with a walkway under the eaves).
• Panel edge finishing — the factory-trimmed roof edge (item 01) eliminates exposure of the PIR core.

Variant I vs II

Aspect	Variant I (this one)	Variant II
Sub-gutter flashing	OB-26 Z-flashing	OB-25 C-channel
Drip edge	none separate	OB-33 additional
Compactness	higher (fewer elements)	lower (more flashings)
Eaves aesthetics	more “industrial”	more “finished”
Price per linear m	base	+15-20%

Variant I is chosen for warehouse halls where aesthetics are secondary. Variant II for retail buildings and offices with greater visibility.

Critical installation aspects

• Factory-trimmed panel edge (item 01) — requires ordering the panel with the “eaves edge” option on the spec sheet. Non-standard = production lead time longer by 2-3 weeks.
• OB-26 Z-flashing — Z-shaped geometry fastened to the roof panel + shielding the gutter inlet. Transverse joints of OB-26 (between linear metres) sealed with butyl compound (item 14) — unsealed joints will leak.
• OB-27 snow guard — installed 20-30 cm above the gutter, every 3-4 linear metres in the wind exposure zone. Mandatory for buildings >12 m in height.
• Gutter — design according to drainage area (typically Ø150 mm for 100 m² of roof slope).
• Roof edge zone — self-drilling fasteners at double density (item 09, 6 pcs/m² instead of 3 in the interior zone) — protection against wind suction forces.

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

Documentation

Gór-Stal Technical Catalogue 2025, p. 99 — cross-section along the slope with gutter.

Components in this junction