Window in ETICS termPIR® ETX — horizontal section

Function of the junction

Horizontal section of a window in ETICS = top-down view; shows what happens on the sides of the window frame. The principles are analogous to the vertical section, but with particular emphasis on:

1. Continuity of termPIR® ETX around the window frame (top, bottom, sides in this detail).
2. Low-expansion installation foam (item 06) fills the 5–15 mm gap between the frame and the reveal.
3. Side sill flashings (item 08) — edges of aluminium sheet folded up and bonded to the top sill, sealed with mastic.

Critical installation aspects

• Side ETX board (item 02) in the reveal — 3–5 cm thick, pressed against the frame with compression onto the foam; without lateral insulation continuity = ψ bridge visible in thermography.
• Installation foam (item 06) applied from bottom to top; trim excess after curing (typically 12–24h), cover with vapour-tight installation tape on the interior side.
• Side sill flashing (item 08) — 25 mm upward fold on both sides of the window, fixed with aluminium rivets to the top sill; sealed with neutral silicone in the corners.
• Bonding the window frame to the wall — three-layer sealing system: foam (middle) + vapour-permeable tape (exterior) + vapour-tight tape (interior) in accordance with the RAL “Energy-efficient window” guideline (DIN 18355).
• Ring beam / lintel: if recessed into the wall → ETX insulation continued across the ring beam (cut strips, geometrically fitted).

Documentation

Technical Catalogue termPIR® — Residential Buildings (Gór-Stal 2022), page 36 — Two-layer ETICS wall, window detail, horizontal section. Scale 1:10.

Components in this junction