2010 uniform plumbing code states.
Installing vent pipe through roof.
True vents also have no water running through them.
This is how i installed my dwv drain waste vent pipe through my metal roof.
A double wall pipe needs a 12 inch clearance space.
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.
Vent a fixture by cutting into the drain line using a saw.
Go into your attic.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
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.
Follow the outline you marked out.
The true vent is aligned vertically and attaches to your drain line through the roof.
There can t be any drains above the point.
With the pipe in a vertical position.
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.
When calculating your chimney pipe size subtract 1 5 inches for each joint overlap.
Try to keep it close to the fan location.
Extend a pipe upward from the tee and tie it into the main vent stack.
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.
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.
This vent pipe rises vertically towards the roof where it opens to the atmosphere to get the needed replacement air.
Cut through the plywood and roofing material with your reciprocating saw.
The metal i m using is called crinkle black i purchased all my materials at h.
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4 repeat the ventilation process with any other fixtures you re installing.
Install a sanitary tee.
Position the vent pipe up to the bottom of the roof.
A single wall pipe will require 18 inch clearance to the ceiling while double wall pipe needs an 8 inch clearance to the ceiling.
How to install a vent pipe through a roof step 1.
Below are some links to the tools i used on this project.
Leave the drill bit sticking through the roof so you can find the hole.
