Proper Vent Pipe Installation Through Roof

Drill a starter hole with the electric drill.

Proper vent pipe installation through roof.

Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run. After tracing the outline of the vent opening on the roofing cut through the shingles with a knife to expose the roof decking and then drill a hole for the vent with a hole saw or reciprocating saw. The stack pipe leads the whole way out through your roof and further underground in the opposite direction to main sewer lines. The shorter the vent pipe the better but 25 feet is the maximum length most dryers can handle.

To install a roof vent start by choosing a good location from inside the attic and then pound a nail all the way through the roof at that location so you can find the spot from outside. Install the pipe securing each joint as needed. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. Water and waste head down the pipe while gasses are vented up and outwards.

Vent pipes run from waste or drain pipes upwards ending outside the building usually sticking up through the roof. In the attic use the plumb bob to mark the center of the hole to be cut for the roof vent boot. The main vent usually rises straight through the roof from the main soil stack a vertical 3 or 4 inch acrylonitrile butadiene styrene or abs pipe depending on system size that connects. Vent pipes provide this air by running outside the structure of the house.

When water drains air must replace the space that was taken up by the water. Plumbing vent pipes are connected to your drain system and are needed for water to drain properly. The stack also allows fresh air in to keep water running smoothly through your piping. Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood.

If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it. It lets air into the system filling the vacuums left. Below are some links to the tools i used on this project. Running a vent pipe out of the roof takes some careful preparation.

This is how i installed my dwv drain waste vent pipe through my metal roof. This allows unpleasant and potentially dangerous odors or fumes to safely leave your plumbing system escaping harmlessly into the air outside. Move the opening 5 feet closer for every 90 degree bend that you need in the vent line and 2 1 2. Be sure to subscribe.