Flashing
What Is Step Flashing?
Step flashing is one of the most important hidden roof details. Homeowners may never see much of it, but when it fails, leaks often show up near walls, dormers, chimneys, and roof intersections.
Table Of Contents
Step Flashing Works In Layers
Instead of one long exposed piece, step flashing is installed in sections so each shingle course can direct water onto the next protected path. That layered approach is one reason it works so well when installed properly.
It Matters Anywhere A Roof Meets A Vertical Surface
Dormers, sidewalls, chimneys, and other roof-to-wall intersections rely on step flashing to keep water from entering at the transition where shingles alone are not enough.
- Wall intersections
- Dormer cheek walls
- Certain chimney edge details
- Complex roof transitions
Need A Next Step?
Use the next-step resource below if you want a more direct service path after reading the guide.
Schedule A Roof DiagnosticLeaks Often Start When The Layering Or Overlap Fails
Improper overlap, missing sections, movement, or patch-based repairs can all undermine step flashing performance. Those problems may stay hidden until the right wind or rain event exposes them.
Repairs Should Respect The Whole Detail
When step flashing is the issue, the repair often needs to address how the wall and roof materials work together instead of just adding sealant at the visible edge.
Frequently Asked Questions
Can step flashing be repaired without replacing the whole roof?
Often yes, as long as the larger roof system and surrounding materials are still in serviceable condition.
Is step flashing visible after installation?
Only parts of the system are visible. Much of the protection works behind or beneath other materials.
Editorial Standards
Educational content in the Wisconsin Roofing Resource Center is reviewed for practical roofing accuracy and written to help Wisconsin homeowners understand repair, maintenance, and replacement decisions in plain language.
Need Help Applying This To Your Roof?
Educational guidance is helpful, but the next step on a real roof should still be based on the actual condition of your home, not assumptions.