When calculating your chimney pipe size subtract 1 5 inches for each joint overlap.
Installing vent pipe through roof.
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Start in the attic and drill a hole through the roof in the desired vent location.
Below are some links to the tools i used on this project.
This vent pipe rises vertically towards the roof where it opens to the atmosphere to get the needed replacement air.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
Leave the drill bit sticking through the roof so you can find the hole.
With the pipe in a vertical position.
You will need to cut the opening to the roof to extend the chimney pipe.
This is how i installed my dwv drain waste vent pipe through my metal roof.
This is best implemented if a fixture rests close to the stack and the top floor of your home allowing the stack to serve as a vent.
Extend a pipe upward from the tee and tie it into the main vent stack.
Try to keep it close to the fan location.
Cut through the plywood and roofing material with your reciprocating saw.
A single wall pipe will require 18 inch clearance to the ceiling while double wall pipe needs an 8 inch clearance to the ceiling.
Extend the vent pipe outside the building according to building regulations.
Install a sanitary tee.
Go into your attic.
True vents also have no water running through them.
To prevent traps in downstream fixtures from being sucked dry like my friend s kitchen sink you install a vent pipe usually within 3 feet close to the fixture trap.
Each vent pipe shall extend through its flashing and shall terminate vertically not less than six inches above the roof nor less than one foot from any vertical surface you can run the pipe at the exterior but you probably should extend above the roof line.
2010 uniform plumbing code states.
There can t be any drains above the point.
What is the normal size of most vent pipes.
In this video i cover installing a roof boot for a vent pipe in a metal roof.
A double wall pipe needs a 12 inch clearance space.
The true vent is aligned vertically and attaches to your drain line through the roof.
4 repeat the ventilation process with any other fixtures you re installing.
Follow the outline you marked out.
Position the vent pipe up to the bottom of the roof.
Usually the vent pipe must extend six inches above the roof or 12 inches 30 5 cm away from vertical walls but double check your building codes and requirements to make sure.
