Home / Glossary / Step Flashing
Roofing Term

Step Flashing

Step flashing is defined as individual pieces of L-shaped metal flashing woven into each course of shingles where the roof meets a vertical sidewall, chimney, or dormer. Each piece of step flashing is typically 5x7 inches and is installed so that it overlaps the piece below it by at least 2 inches, creating a cascading water barrier. Step flashing is considered the most effective method for waterproofing wall-to-roof transitions and is required by the IRC for all sidewall intersections on asphalt shingle roofs.

Source: SquareDash Roofing Glossary, 8,900+ completed projects

Related roofing terms

Flashing

Flashing is defined as thin pieces of impervious material, typically galvanized steel, aluminum, or copper, installed at roof transitions, penetrations, and intersections to prevent water from entering the building envelope.

Counterflashing

Counterflashing is defined as a piece of metal flashing that is embedded into or attached to a vertical surface such as a wall, chimney, or parapet to overlap and protect the top edge of step flashing or base flashing below it.

Dormer

A dormer is defined as a roofed structure containing a window that projects vertically from the slope of a main roof, adding usable space, natural light, and ventilation to the attic or upper floor.

Cricket

A cricket is defined as a small peaked structure built on the backside of a chimney or other roof penetration to divert water and prevent ponding and debris accumulation.

Learn more

Roof Replacement Cost Guide → Roof Replacement Services → Get Your Instant Roof Price →

Get your exact roof price

30 seconds. No salesman. No obligation.