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.
Free starter pack
Building your German vocabulary?
Get the 100 most common German words as a free PDF — one email, no spam.
Related Words
Explore German by topic
