Une toiture doit incontestablement être étanche à l'éau. Les matériaux comme la tôle, le zinc ou le cuivre ne constituent pas la partie principale de la couverture de toit mais accrochent les regards et servent au drainage des eaux pluviales. Ces matériaux sont surtout importants pour conduire les eaux à certains endroits tels que les noues.

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