Using the tape measure determine the size of the cut into the roof that will be necessary to insert the vent into the space.
How to install a vent pipe on a metal roof.
This is done because you need to overlap the flashing.
The metal i m using is called crinkle black i purchased all my materials at h.
This is how i installed my dwv drain waste vent pipe through my metal roof.
Trim the edges of the roofing membrane by an inch all around.
Below are some links to the tools i used on this project.
Apply silicone caulking around the area where the vent pipe penetrates the roof.
Go into your attic.
Position the vent pipe up to the bottom of the roof.
Measure the body of the vent.
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The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
With the pipe in a vertical position trace around the pipe using a pencil.
In this video i cover installing a roof boot for a vent pipe in a metal roof.