Function of the junction
A fire gable wall is a party wall in a semi-detached or terraced house — it requires fire resistance of REI 60–120 in accordance with PN-EN 13501-2. At the same time, it must not become a thermal bridge.
Solution as per the catalogue:
- Ring beam closing the fire wall (item 08) — reinforced concrete ring beam at floor / eaves level, a continuation of the wall’s load-bearing structure.
- termPIR® ETX (item 09) on the external surface of the wall — ETICS with ETA, fire reaction class B-s1, d0 (system with mineral cover).
- termPIR® AL between and under the rafters (items 06, 07) — continuation of roof insulation, running down onto the ring beam.
- Low-expansion PIR foam (item 12) — fills the 5–15 mm gap between the roof insulation and the ring beam.
Critical installation aspects
- Fire reaction class of the termPIR® ETX system with mineral cover — per ETA 17/0066 = B-s1, d0 (self-extinguishing, low smoke, no flaming droplets). Meets fire requirements for gable walls.
- Low-expansion PIR foam (item 12) — must be low-expansion; high-expansion foam will burst the joint between the ring beam and the insulation, creating a gap for fire.
- Fire-resistant ring beam (item 08) — the fire wall must extend at least 30 cm above roof covering level (for semi-detached houses, per WT § 235). termPIR® boards in this strip are covered by galvanised sheet flashing.
- Wind barrier (item 04) terminated on the ring beam with a 200 mm turn-up onto the wall + sealing with butyl tape.
- Self-drilling screw (item 11) — fixing the rafter structure to the ring beam through the termPIR® board → long timber screws 200+ mm.
- termPIR® AL board cut at the joint with the ring beam — seal with low-expansion foam around the perimeter.
Present in the system pitched roof — termPIR® under-rafter.
Documentation
Technical Catalogue termPIR® — Residential Buildings (Gór-Stal 2022), page 24 — Pitched roof W I, detail at the gable wall. Scale 1:10.
Components in this junction
Insulation (3)
- 06 Between-rafter thermal insulation — termPIR® AL board
- 07 Under-rafter thermal insulation — termPIR® AL board
- 09 Wall insulation — termPIR® ETX board
Fastener (1)
- 11 Self-drilling timber screw
Sealant (2)
- 10 Low-expansion polyurethane assembly foam
- 12 Gap filled with low-expansion PIR foam
Element (6)
- 01 Roof covering — roof tiles or sheet metal
- 02 Batten
- 03 Counter-batten (min. 40 mm thick)
- 04 Wind barrier — vapour-permeable membrane
- 05 Timber rafter
- 08 Ring beam closing the fire wall