Patent ID: 8056289

Claim:
A modular upstanding seam flange panel unit comprising: interlocking metal male and female locking engagement members each having upwardly and downwardly disposed cavities, wherein the male locking engagement member includes a guide member having a first nub and the female locking engagement member includes a walled cavity structured for receiving the guide member, the walled cavity having a corresponding second oppositely directed nub on a wall of the cavity positioned to engage the first nub on the guide member of the male locking engagement member as the male and female locking engagement members are moved into interlocking position; opposed elongated top and bottom upstanding seam flange panels with corresponding elongated upwardly and downwardly directed seam flanges disposed at opposite lateral edges of the panels captured in the upwardly and downwardly directed cavities of the interlocking metal male and female locking engagement members and an airspace disposed between the panels, and the modular panels having skins with substantially lower ultimate tensile strength than the ultimate tensile strength of the interlocking metal male and female locking engagement members.