Roof Step Flashing Details

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.

Roof step flashing details.

Step flashing protects the joints between the roof deck and chimneys or dormers. Step flashing fits to each course of shingles and appears to step up the wall of the chimney. Head flashings are used to direct water away from openings such as windows and doors. It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing.

Wind driven rain and snow can penetrate between step flashing pieces and wet the sidewalls and the roof. Continuous flashing against a sidewall is one way to install a roof but it s not the correct way. The vertical flange of the flashing is to extend up behind the adjoining siding. Some roof features such as chimneys require two pieces of flashing.

Step flashings are to be installed one per course. Even if one piece of step flashing fails the flashing and shingle below it start the process over again. Continuous flashing is also called apron flashing because it acts a lot like an apron. So we instruct our roofers to run the ice barrier membrane and the roof underlayment up the sidewalls.

Vent pipe flashing fits over flues or pipes. This ensures that rain always. Stepped flashing is used where a sloped shingled roof intersects a vertical wall. These are the key types of roof flashing you need to understand.