Window in three-leaf wall — horizontal section

Junction function

Horizontal section of a window in a three-leaf wall = top-down view showing the side reveal. Key point: continuation of termPIR® AL (item 02) between the load-bearing and outer leaf around the entire perimeter of the window.

Geometric challenges:

1. Last side brick pieces in the outer leaf — often cut to size; with a 120 cm wide window and a 24 cm brick module → there is a 24×n remainder, the last brick must be cut.
2. Stainless steel anchors (item 05) in a 30 cm band along the window edge are densified — every 30 cm instead of 50 cm (outer leaf stiffness at the opening).
3. Side sill flashing (item 08) — sheet metal bent on both sides of the window, sealed with mastic.

Critical installation aspects

• Side termPIR® AL board (item 02) — continued along the sides of the window; without this, a ψ thermal bridge is visible in thermography along the perimeter band.
• Installation foam (item 06) low-expansion, 3-layer sealing system in accordance with RAL (vapour-tight from the interior + vapour-permeable from the exterior + foam in the middle).
• Anchors at the corners (item 05) densified — every 30 cm in a 30 cm band along the window edge; the rest of the wall every 50 cm.
• Last side bricks of the outer leaf — cut with a thin diamond blade; smooth edge vs. broken with a hand tool (breaking creates a defective joint for water).
• Side sill strips (item 08) — bent 2.5 cm upwards, riveted to the upper sill, silicone in the corners.

Documentation

Technical Catalogue termPIR® — Residential Buildings (Gór-Stal 2022), page 40 — Three-leaf wall, window detail, horizontal section. Scale 1:10.

Components in this junction