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How To Install A Leak proof Pipe Flange


These pesky little roof penetrations are very common sources of roof leaks. There are two major reasons for these leaks, and we will go over these issues.  I will provide you with solutions as well as a technique for a leak proof pipe flange/boot, that I will refer to as  JHurst flange technique.

  •  The first being that the rubber gasket has worn and cracked.
  •  The second reason  is improper installation technique.

There are various installation errors that may occur  when these flanges/boots are applied. The first and formost error is an issue that I deal with on a regular basis, this erroneous installation procedure is called “burying” of the pipe flange. Burying of the pipe flange promotes water retention, when you want the roof to shed water.
. When installed correctly, the top half of the flange should be covered
with shingles,and the bottom of the flange should be on top of the shingles and visible. There may be
slight differences, depending on how the shingles
are falling. A good rule of thumb to use is to have at least two shingles underneath the pipe flange itself. Some shingle manufacturers recommend setting  pipe flanges into roofing cement. In my experience,most good roofers do not use roofing cement on a shingle roof. Using
roof cement on plastic or rubber pipe flanges causes the flanges to break down and fail. Please watch the instructional video below of me installing a leak proof pipe flange.

This is a proper flashing diagram

Pipe flange with rubber seal cracked and broken



2 comments on “How to install a leak proof pipe flange onto your roof”

  1. There are not too numerous home owners about that would say they’ve no use to get a backyard deck and deck railings. Most people think of a patio or deck as a location to relax and have some fun with family and friends. The factor is really a backyard deck is fantastic, but if it doesn’t fulfill your expectations then it is a useless area that will not be used extremely often.

  2. Thanks for guiding us on how to install leak proof pipe flange,it seem you are very professional here thanks for sharing it to us.