Abstract: A roof flashing and counter-flashing assembly for providing a fluid-sealing passageway for pipes, tubes and conduits through the roof of a building including a sleeve anchorable at one open end to the roof about the roof opening through which the pipe, tube or conduit passes, a roof flashing member having a sleeve portion slideably mateable about the other sleeve and a radially-extending flange portion about the one end of the sleeve portion positioned immediately over the anchorable portion of the sleeve, a cap to sealingly cover the unanchored open end of the sleeve and having an opening therethrough through which the pipe, tube or conduit will pass and a pair of receptacles therein, an annular seal disposed between the cap and the sleeve and the cap and the roof flashing member, a double sealing washer slideably mateable about the pipe, tube or conduit and adapted to seat about the opening in the cap, a retainer clamp having an aperture therein to fit freely over the pipe, tube or conduit and a pair of add