Vent flashing done right to prevent leaks back up roof vent boots with flashing counterflashing and proper shingling.
The counter flashing at a roof to wall intersection is.
Because most roof flashing is required to extend up the wall a minimum of 4 and some a minimum of 5.
Here s how to install it correctly.
However typically in gables the flashing installed consists of a base flashing and a counter flashing.
Use step flashing that has a 2 to 4 inch longer vertical leg than normal.
Roof to wall and deck to wall flashing www fema gov.
Most simply use a nominal 6 piece of lumber.
The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material.
But flashing that extends through the veneer and weep holes are often omitted.
Epdm flashing tape with a butyl adhesive backing will help.
Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks.
At roof to wall intersections see figure 1.
When installing metal or rubber membrane roofs use continuous flashing rather than pieces of step flashing.
Install kick out flashing at the end of a roof wall intersection to divert water away from the wall and into gutters.
Most mason contractors are diligently installing flashing and weep holes at the base of walls as well as at the window head and sill.
Our page top photograph illustrates a successful installation of flashing and counter flashing along intersection of a roof surface with the side of a brick constructed dormer.