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I wondered whether what is being referred to here was "insulation". I am thinking of the kind of insulation that is laid between roofing and ceiling boards. If the roof leaks, it definitely gets stains or marks (manchas). My other wild guess is that it refers to the ceiling boards themselves. Posted as a discussion entry because of the "wild guess" factor.
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Explanation: covering panels
Nick Taylor Local time: 08:38 Native speaker of: English PRO pts in category: 12