Two-piece roof vent flashing and method for making same

A roof flashing for establishing a weather-proof seal with an upstanding pipe passing through an opening in a roof, said roof flashing comprising:

• a base element, with said base element integrally formed of thermoplastic and comprising a base plate and an upstanding central dome portion with a central opening therein, said domed portion having a solid flange inwardly disposed and surrounding said central opening, with said flange having an upper, lower, and inner surface, and
• a sealing collar, said sealing collar being integrally formed of elastomeric material and comprising a central portion, said central portion having a generally circular opening therethrough, and an outer, generally radially outwardly extending annular connecting portion molded directly to the solid flange portion of said base member, thereby creating a connection between the sealing collar and the flange,
• wherein the connection between the sealing collar and the flange defines a minimum seam passage distance of at least 1 inch.

A roof flashing for establishing a weather-proof seal with an upstanding pipe passing through an opening in a roof, said roof flashing comprising:

• a base element, with said base element integrally formed of thermoplastic and comprising a base plate and an upstanding central dome portion with a central opening therein, said domed portion having a solid flange inwardly disposed and surrounding said central opening, with said solid flange having an upper and lower surface, said solid flange having a substantial irregularity on at least one of the flange surfaces,
• a sealing collar, said sealing collar being integrally formed of elastomeric material and comprising a central portion, said central portion having a generally circular opening therethrough, and an outer, generally radially outwardly extending annular connecting portion molded directly to the solid flange portion of said base member, thereby creating a connection between the sealing collar and the solid flange.