Abstract: A roofing shingle is conveniently formed from a square sheet metal blank. One corner of the blank is provided with a pair of open ended, back to back U shaped slots transverse to a diagonal passing through that corner. The two sides intersected by the slots are downwardly turned to form a small margin, and the other two sides are upwardly turned to form a margin of similar width to the downwardly turned sides. The corner is also downwardly folded above the slots to form a margin of similar width to the other margins, and below the slots it is folded so as to be generally parallel to the central area of the shingle. A shingle support preferably of foamed sheet polystyrene is disposed on the under surface of the shingle. The shingles are layed course by course on a pitched roof in a diamond configuration, a shingle of an upper course engaging the respective downturned edges of two adjacent shingles of a lower course in the U shaped slots to lock the lower corner of the upper shingle mechanically in position.