On top of the London tower block, when Frank is explaining to Jim about the water situation and tells him about using a method he saw on TV, using a plastic sheet to capture dew and condensation, but can't make to work. That's because he's using that method on an asphalt roof. This only works if you use it over soil, as the plastic sheet is intended to capture and collect moisture and condensation rising from the earthen ground.

Film

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