This is how i installed my dwv drain waste vent pipe through my metal roof.
How to install vent pipe flashing on existing metal roof.
To make the installation easier you can turn the flashing as you lower it in place.
I prefer to use a dsa flashing also known as a dead soft aluminum flashing.
This flashing is super thin and very flexible to curve around the humps in the metal roofing.
1 remove nails holding down shingles above the pip.
Put one nail in the bottom edge with a dab of caulk under it to seal the.
Hammer the nails into the top and sides of the flashing.
Roofing nails per side photo 2.
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Rubber vent flashing automatically adjusts to any pitch lift the vent enough to spread caulk under the sides but not the bottom edge then nail with three 1 1 4 in.
How to install a flashing on a metal roof.
Below are some links to the tools i used on this project.
Following is the proceedure for installing the dsa flashing.
After installation you ll then re lay the shingles you removed to provide a comprehensive water tight solution.
Center the pipe in the flashing and push the flexible front corners up or down so that the flashing pipe is parallel to the vent pipe.
Typically flashing is installed using roofing nails and roofing cement.
Slide the new flashing over the vent pipe and under the shingles above the pipe.