Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.
How to do step flashing on a roof.
The key elements of the process include.
Wide and 2 in.
Lay an ice and water shield to the edge of the roof deck.
Cover tops of step.
Longer than the shingle s exposure.
Step flashing step flashing redirects the water back onto the shingle.
Place felt paper underlayment on the roof deck ensuring the underlayment turns up at the sidewall a minimum of three.
The vertical flange of the flashing is to extend up behind the adjoining siding.
How to install roof flashing against a wall.
Here s how to do it right the first time.
Nail flashing to roof deck only.
Starting at the bottom of the roof install kick out flashing and then place.
The roof deck flange of step flashings are to be fastened to the surface of each shingle in a position whereby the next course of shingles will cover up hide the flashing from view.
Install the step flashing when the siding is installed it should be tucked behind this piece and then consecutive courses lapped over it.
Step flashings are to be installed one per course.
The remaining siding on the sidewall will overlap the step flashing and nail.