Next cut a piece of flashing that s several inches larger than the hole and secure it overtop of the hole using roof cement.
How to secure flashing on roof.
Once you ve shingled up to the sidewall cut a piece of step flashing at a 45º angle from the outside corner to the bent seam.
Nail it in.
Next place your vent flashing on top of the membrane.
Bend it down and back to sit flat on the corner.
Wipe away any sharp edges and corrosion using a stiff bristled brush.
Bend the corner flashing tightly around the corner.
Step 1 safely get on the roof to seal your roof flashing you first have to get on the roof.
Add another liberal coating of roof cement around the outside edges of the patch to form a water tight barrier.
In order to do so safely you will need an extension ladder and rubber soled non slip shoes.
Recaulk the joints between the roof and the flashing.
Fasten loose nails and cover exposed nail heads with roofing cement.
Make corner flashing from step flashing.
It s much easier to reseal the flashing than it is to patch a water stained wall or ceiling.
Apply a thin bead of silicone around the opening of the vent pipe area and lay the membrane in place.
Before attempting to get to the roof you must make sure that the ladder is secure.
The metal flashing must overlap the material not the other way around.
How to install step flashing with a wall corner.
Ensure it sits flat and extends at least 8 inches above the shingles.
Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing.
Re caulk your chimney flashing.
Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right.
Take a second piece of flashing and set it down in place.
Then sink two nails in the wall near the top one on each face.
Cut some membrane material to seal between the vent flashing and the roof and cut an opening for the vent.
