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Weatherproofing double-shell external wall structures

The outer wall must be made weatherproof. Clinker bricks, exposed sand-lime brickwork, or concrete facing bricks are all possible options.

Facing brickwork at window surround, backed by layer of insulation 20 cm thick with λ = 0.025 W/mK and a U value of 0.12 W/m²K (source: Schulze Darup)

Diagram of double-shell masonry to passive-house standard; the insulation must be implemented using high-grade insulation material with λ ≅ 0.02 to 0.025 W/mK; it is important to select wall anchors certified for up to 20 cm of space between the shells (source: Schulze Darup, adapted)