Continue the next row of shingles cutting a hole for the vent pipe.
Installing vent pipe roof flashing.
Roofing nails per side photo 2.
Cut some membrane material to seal between the vent flashing and the roof and cut an opening for the vent.
Put one nail in the bottom edge with a dab of caulk under it to seal the.
The main reason homeowners choose to install or replace the vent pipe flashing on their roof is to stop or prevent leaks which may also help extend the lifespan of the roof.
1 remove nails holding down shingles above the pip.
Carefully remove all the shingles from the flashing.
It s soldered to a roof flange that layers into the shingles.
When you install roof flashing you will need to use a sealant.
The metal flashing must overlap the material not the other way around.
Add a large bead of caulk in a half moon shape around the flashing and put the shingles back in place.
While roofing professionals occasionally use nails when flashing they must choose whether to nail to the roof plane or the vertical wall.
These need to be fabricated or ordered to match a specific roof pitch and pipe diameter.
Apply a thin bead of silicone around the opening of the vent pipe area and lay the membrane in place.
The traditional pipe flashing is a soldered lead riser pipe that encloses the vent pipe and folds in the pipe at the top.
Apply the last row of shingles that is just below the vent pipe as shown in figure 1.
Rubber vent flashing automatically adjusts to any pitch lift the vent enough to spread caulk under the sides but not the bottom edge then nail with three 1 1 4 in.
Now that the old flashing is gone you can slide the new flashing over the pipe vent and maneuver it under the shingles above the pipe.
Center the pipe in the flashing and push the flexible front corners up or down so that the flashing pipe is parallel to the vent pipe.
If nailed to both the flashing may deform under the pressure from shifting brick or wood.
Use one roofing nail in each corner of the flashing to secure it to the roof.
Next place your vent flashing on top of the membrane.
Figure 1 install shingles just below vent pipe.
Be sure to clean the outside of the pipe from old caulk that could be in the way of the flashing.
Over time the flashing around plumbing vents can rust or deteriorate and it will need to be replaced.
Remove the old and clean the pipe.
