Abstract: A T-Lock shingle installation tool comprises a plate having a hand grip provided therein, a pair of tapered leading insertion edges at a forward end of said plate that are separated by a recessed portion. The plate may taper from back to front, and the insertion edges each may have a knife-like forwardly projecting tapered edge. The plate may be provided with an aperture located near a back edge of the plate with the hand grip being defined between the back edge and the aperture.