Abstract: A cover for roofs including at least one joint having a first portion and a second portion counterposed, a first sheet, a second sheet, the first sheet including a respective first lateral edge defining a first longitudinal rib, the first lateral edge being fittingly couplable to the first portion of the joint for engaging said first rib within a first recess of the first portion. The second sheet includes a second lateral edge defining a second longitudinal rib and being fittingly couplable to the second portion of the joint for engaging the second rib within a second recess of the second portion. The second lateral edge comprises a terminal portion superimposed to the first lateral edge substantially at the centreline of the joint. The terminal portion of said second lateral edge includes an extension having the free end folded and engaged in the first rib of the first lateral edge.