Pipe flashing apparatus and method

1. A roof flashing for forming a weather-proof seal about pipes of different diameters extending through openings in building structures, the flashing comprising:

a collar having a conical shape with a bottom edge and an apex end for passage of the pipe, the collar comprising a wall of elastomeric material wherein the wall has annular grooves forming tear lines for removing a portion of the collar allowing the collar to sealingly engage different diameter pipes;

a base having a tapered cylindrical shape formed by a wall of elastomeric material, the base having an opening formed by a top edge wherein the top edge is coupled to the bottom edge of the collar forming an annular intersection edge, the annular intersection edge comprising an unobstructed outer surface angularly transitioning from a first gradient of an outer surface of the wall of the collar to a second gradient of an outer surface of the wall of the base, the base further having a bottom edge; and

a foot having an annular opening where the annular opening is coupled to the bottom edge of the base, the foot having a substantially rectangular shape and configured so that a front portion of the foot may be installed atop one or more shingles of a shingle roof and a back portion of the foot may be installed beneath one or more shingles of the shingle roof,

wherein the roof flashing has a longitudinal opening defined by opening members that extend from the apex of the collar to an edge of the foot thereby allowing the flashing to be spread apart and placed about a pipe, whereupon the opening members are pressed together and secured by coupling members that seal the longitudinal opening,

wherein the opening members comprise a first opening member and a second opening member,

wherein the first opening member comprises a substantially L-shaped extension comprising a first long portion extending outward from a first base wall opening edge and a first short portion extending perpendicular to the first long portion and in a direction away from the longitudinal opening,

wherein the second opening member comprises a second substantially L-shaped extension comprising a second long portion extending outward from a second base wall opening edge and a second short portion extending perpendicular to the second long portion in a direction toward the longitudinal opening, and

wherein the second long portion is longer than the first long portion and the second short portion is configured to contact a top surface of the first short portion when the first opening member and the second opening member are coupled together.

2. The roof flashing of claim 1 , wherein the second substantially L-shaped extension comprises an outer curved surface for receiving a curved inner surface of the coupling members.