Unterspannbahn

roofing underlay

noun UN-ter-shpan-bahn Rare

Also means

breathable roofing membrane

Usage Note

Unterspannbahn is a diffusion-open or diffusion-tight membrane laid directly under roof tiles; it sheds any water that penetrates the outer covering while allowing moisture vapour from the insulation to escape.

Examples

"Die Unterspannbahn wird über den Sparren aufgerollt, bevor die Latten kommen."

Natural Translation

The roofing underlay is rolled out over the rafters before the battens go on.

Literal Translation

The roofing-underlay is over the rafters rolled-out before the battens come.

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