Need Advice with waste vent

[tmy23]

Greetings and thanks in advance for all help! I'm adding a master bath and at the stage where I need to run the vent through the roof. We live in a 135 year old victorian with a mansard roof. Essentially the outside "walls" of the third floor are exterior roof at about 70 degrees. This floor is finished and so there is about a 4' wide void between the interior walls and the void. To avoid running into the living space, I ran the 2" vent into the void and it has to go out the 70 degree sloped part of the roof.

So I have 2 questions.

1. A recommendation for a quality vent boot that will handle a 70 degree pitch.

2. Running a 2" vent through that slope will require an elongated hole in the roof sheething probably a foot long. To avoid that I was planning 2 45 elbows at the point where it penetrates the sheething. Is there any problem with that approach?

Thank you for all help.

 

[frodo]

I would .......do a "DAN" LOL

drill 2 holes, then stick the pipe thru the hole on an angle, pull it to a level position

thereby deforming the existing roofing material in a forceful manor

my choice in flashing would be a high boot lead flashing

 

[journeyman]

If you drill it right it won't be elongated don't follow the pitch put drill bit straight

 

[Zanne]

Is the new bathroom too far from the main vent stack to be able to connect to it somewhere in the attic or inside of a wall? That would negate the need to add more holes in the roof (assuming there is already a vent stack going out through the roof somewhere) but would take more pipe to run.