A foldable flat panel member having a central horizontal fold line along its entire length and a front vertical edge and a rear vertical edge, the same vertical height as the panel and a length of about 1/7 to 2/3 of the panel, A laminated laminated composite flooring unit for roofs, comprising a separate collapsible ridge piece member having a continuous front vertical edge and a continuous rear vertical edge and a central horizontal fold line coincident with the fold line of the panel. The base piece is laminated to the panel in a vertical region of 1.27-7.62 cm (0.5-3 inches) that is part of its vertical height to provide a laminated and non-laminated portion of the ridge piece, the ridge piece being a ridge piece. The rear vertical edge of is placed in line with the rear vertical edge of the panel and during deformation the unlaminated portion of the ridge fragment Laminated composite floor covering unit for roofing, characterized in that mounted on the panel member in such a way that it can be moved freely in the vertical direction on the panel surface.
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