Start in the attic and drill a hole through the roof in the desired vent location.
Vent stack through metal roof.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
Round penetrations round shapes such as plumbing vents or pipe supports for rooftop equipment should be flashed through the roof using epdm ethylene propylene diene monomer rubber pipe flashings.
Leave the drill bit sticking through the roof so you can find the hole.
Metal sheets 1 no caulk vent pipe 42 pipe boot flashing 5 pipe flashing 44 rain diverter 2 roof edge 1 roof jack 6 saddle.
The typical vent system consists of a network of pipes that connect to every drain p trap and extend via a main stack that pokes through the roof just above the main bathroom.
With the pipe in a vertical position trace around the pipe using a pencil.
Frame mounted hvac unit using pipe supports extending down to the building structure and flashed through the roof using rubber pipe flashings.
For one reason or another it may be impractical or impossible to construct this main vent through the roof so it s usually permissible to extend it from another part of the house.
Position the vent pipe up to the bottom of the roof.
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Amazon s choice for metal roof vent boot oatey 14052 25 4 master flash 8 x 8 base for use with profiled materials and can be installed on every type of roofing surface 0 25 5 75 1 4 inch 4 inch.
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I really hate cutting holes in roofs but it was this or run 15 feet of vent hose through a gable end.
The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
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Oatey retro master roof flashing 1 4 in to 4 in x 8 in epdm rubber vent and pipe flashing.
Go into your attic.