| 摘要 |
Purlins (25) arranged on the underside of a waterproof sheet (23) of a prefabricated roof, and also other supports (18) extending transversely with respect to the slope direction of the waterproof sheet (23), possess, on their side facing in the slope ascending direction, channel-like profile sections (22, 26) for collecting any condensation which may have formed below the waterproof sheet (23). The drops of water first flow in the slope direction as far as the purlins (25) and supports (18), at which point the drops run downwards into the channel profiles (22, 26). <IMAGE>
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