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THE HOUSE FILES · Roofing & Attics

Missing Step Flashing at a Roof–Wall Intersection

Where a roof meets a wall, missing or failed step flashing can let water slip behind the wall covering and into the framing.

  • Step Flashing
  • Roof Leak
  • Flashing
  • Water Intrusion

Brandon VaughnLicensed Home Inspector

Published July 14, 2026

Roof-to-wall intersection where asphalt shingles meet vertical siding and trim near a gutter, with staining and an incomplete flashing transition

Direct Answer

Where a roof plane meets a vertical wall, each course of roofing normally needs step flashing (and often counterflashing or proper wall covering integration) so water cannot run behind the siding. Missing, incomplete, or failed step flashing is a common water-intrusion risk and should be corrected by a qualified roofing professional.

PLAN FOR CORRECTION

This should be corrected.

Have a qualified roofing contractor evaluate the roof–wall intersection and install proper step flashing integrated with the roof covering and wall finish. If interior stains or soft materials are present, plan for evaluation of hidden damage as the intersection is opened.

Urgency
Plan correction
Next step
Schedule a roofing evaluation
Who to call
Roofing contractor

How to Identify It

  • Shingles run into siding or trim with little or no visible metal flashing at each course
  • Siding or trim cut tight to the roof without clearance and flashing layers
  • Rust stains, dark streaks, or soft/discolored siding at the wall base above the roof
  • Interior ceiling or wall staining on the room side of a roof–wall intersection
  • Previous caulk beads used as a substitute for flashing (caulk is not step flashing)
  • Roof covering repairs that skip reinstalling step flashing when reroofing

Why It’s Not Acceptable

Step flashing is part of a layered water-management system. Each bent metal piece (or equivalent listed detail) sheds water down onto the course of roofing below so it cannot run uphill along the wall line into the wall assembly.

When that layer is missing, incomplete, or buried behind cladding, moisture can wet sheathing and framing for years before interior stains appear. Caulk alone is not a durable substitute for flashing at this transition.

Photographs of a bad intersection document an installation concern. They do not, by themselves, prove every leak path, the full extent of hidden damage, or that the entire roof covering has failed.

What a Proper Correction Should Accomplish

  • Expose the roof–wall intersection enough to assess and correct flashing (and any wet sheathing)
  • Install proper step flashing integrated with each roofing course
  • Integrate wall covering / counterflashing so water is directed onto the roof surface, not into the wall
  • Maintain appropriate clearance between roof covering and combustible wall materials where required
  • Repair or replace damaged sheathing, underlayment, or cladding discovered during the correction
  • Do not rely on caulk alone as the water barrier at this transition

Example From an Inspection

During a real inspection, silicone and incomplete flashing detailing were noted at a roof–wall transition. The report recommended opening the transition and installing proper flashing so water sheds onto the roof rather than into the wall.

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