Roof panel joint

A joint between roof panels of the type comprising inner and outer skins connected in shear-transferring relation by an insulating core. The joint comprises male and female marginal connecting means formed along the upper edges of adjacent side walls presented by the outer skins of adjacent panels. The male and female connecting means are inter-nested, the female connecting means is bent, that is, closed about the male connecting means thereby to provide a primary interlocking connection of the standing seam type. A sealant engaging the male and female connecting means provides a primary weathertight seal at the exposed surface of the roof structure. Complementary mating elements may be formed along adjacent inner edges of the adjacent composite panels to provide a second connection at the interior face of the roof structure.