Abstract: A deflector adapted to be mounted between overlapping shingles along the edge of a roof, and also a shingled roof in combination with such a deflector. The deflector includes a substantially flat base with a side edge and a front edge extending at an angle from said side edge, a first upstanding lip integral with said base along said side edge and substantially perpendicular to said base, and a second upstanding lip integral with said base along said front edge and integral with said first lip and substantially perpendicular to said base, said upstanding lips forming a continuous deflector lip adapted to deflect liquid.