Unterdeckbahn

roofing underlay, sarking membrane

noun UN-ter-dek-bahn Rare

Usage Note

Unterdeckbahn is a vapour-permeable but water-resistant membrane laid directly under the roof tiles; it allows moisture from the insulation to escape while keeping wind-driven rain and blown snow out — a mandatory element in modern roof construction.

Examples

"Die Unterdeckbahn wurde vor dem Verlegen der Dachlatten gespannt."

Natural Translation

The sarking membrane was laid before the roof battens were fixed.

Literal Translation

The underlay-membrane was before the fixing of the roof-battens stretched.

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