Abstract: A prefabricated flashing for a weatherhead or other pipe which protrudes through roofs of structures such as a house to prevent rain or water seepage and which is adaptable to conform when assembled to any customary degrees of roof inclinations. The flashing includes an upper half of flashing and a lower half of flashing, each of which has a lip that can be easily secured together to surround a portion of the weatherhead or other pipe which protrudes through the roof. A clamping mechanism is provided for securing the upper half of flashing and lower half of flashing to the weatherhead.