It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing.
Roof to wall step flashing detail.
If you wanted to horizontal caulk it would only be at the top of the flashing.
Step flashing redirects the water back onto the shingle.
Next install the step flashing with the next course of shingles over top of it.
Kick out flashing is a piece of flashing that hangs over the edge of the roof helping to divert water away from the adjacent wall or around any obstacles that the roof may butt into.
Factory shingle cut against the wall minimum 12 butted up snug.
N at roof to wall intersections see figure 1.
This process will continue up the entire roof.
N use flashing cement at joints to help secure flashing.
Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.
The flashing extends up the wall at least 4.
The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
On a high wind wall low pitch vertical caulk at the roof edge of the flashing for insurance.
The flashing material should be 4 inches by 7 inches in length when it lies on the roof deck.
Flashing joints are lapped 6 in the direction of water flow.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Step flashing needs to turn up a minimum of three inches up the sidewall.
Where snow buildup is anticipated add a band of peel and stick membrane over the step flashing but under the sheathing wrap as shown.
Same type of metal as the flashing material.
Even if one piece of step flashing fails the flashing and shingle below it start the process over again.
Guide to step flashing at building roof wall intersections.
