- 1). Remove any old flashing material from the pipe. A pry bar may be needed to help loosen the shingles or roofing material around the pipe. Pull the old flashing off the end of the pipe. If there is no old flashing to remove, then you can begin the installation of the new flashing.
- 2). Slide the preformed flashing down over the pipe. Check to see that you have the right size. The rubberized portion of the flashing should fit snugly around the pipe and the flashing base should lie flat against the wall or roof surface. If you are unable to use a preformed flashing because of nearby obstructions, such as other pipes, then apply roofing adhesive to any visible openings around the pipe and wrap rubber flashing (adhesive sided) around the pipe. Wrap the rubber flashing to look like an upside down cone so that water runs away from the center of the pipe.
- 3). Remove the flashing from the pipe and apply the roofing adhesive to the inside edges (underneath) of the preformed flashing base.
- 4). Place the flashing hole over the pipe again and slide it down until it is close to the work surface. Lift up nearby shingles that you may have loosened earlier so that the top half of the flashing is positioned underneath the uppermost shingle.
- 5). Hammer four roofing nails into the four edges of the flashing base. This will bond the flashing base and the roof adhesive to the roof or wall surface.
- 6). Seal over the exposed nail heads with roofing adhesive.
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