Screw it down in a way that its fits tight over the humps of the metal roof.
How to install a vent pipe through roof.
Choosing a whole house fan.
Go into your attic.
Use your feet to flatten the flashing down over the contour of the 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.
How to install a vent pipe through a roof step 1.
4 repeat the ventilation process with any other fixtures you re installing.
Be sure to extend the pipe up at least 2 to 3 above the roof to prevent snow buildup from causing problems.
Apply a bead of asphalt roof cement on the bottom of the vent.
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After screwing it down securely do another bead of silicone around the edge also put some silicone on all the screws as well.
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.
Below are some links to the tools i used on this project.
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Position the vent pipe up to the bottom of the roof.
You can buy the proper flashing to install it on a flat roof and a roof cap that has screen around it to prevent insects from entering.
With the pipe in a vertical position.
Use your finger or a tool to smooth the silicone around.
Nail the lower corners with roofing nails and tar the heads.
Extend the vent pipe outside the building according to building regulations.
True vents also have no water running through them.
This is how i installed my dwv drain waste vent pipe through my metal roof.
Once we had the pipe extension connected we figured out where the new vent pipe would need to pass through the roof using a piece of scrap wood held flush with the pipe.
Slide the vent under the shingles so they cover the top half of the vent flange.
Cut through the plywood and roofing material with your reciprocating saw.
The lower half of the flange sits on top of the shingles.
Follow the outline you marked out.
The true vent is aligned vertically and attaches to your drain line through the roof.
