Abstract: Apparatus for flashing rooves, particularly inclined rooves, around vent pipes or the like using a relatively thin sheet of material to surround the pipe (10) and form part of the roof. The apparatus comprises an inner sleeve member (12) adapted to fit over the pipe (10) and pass through a hole in said sheet which accommodates the pipe. The sleeve (17) has an inclined flange (13) which bears on the underside of said sheet (11). A further similar sleeve (16) is adapted to fit over the inner sleeve (12). The outer sleeve (16) has a flange (17) which bears on the upper surface of the sheet (11) and a locking cap (18) threadably engages the upper end of said inner sleeve (12) in a manner forcing the outer sleeve (16) downwardly such that the two flanges (13, 17) clamp the sheet therebetween.