Roof-to-Wall and Step-Flashing Leaks in Texas City

Anywhere a roof meets a vertical wall. A second-story wall above a porch roof, a dormer, an addition. Relies on step flashing to keep water out. This is one of the more overlooked leak sources because the failure point is often hidden behind siding or trim.

How Step Flashing Works

Step flashing consists of individual L-shaped metal pieces woven into the shingles and up the wall, overlapping each other like shingles themselves so water is directed down and away from the wall-roof junction. Done correctly, it’s a reliable system. But it depends on every piece being installed and overlapped properly.

Common Failure Points

• Improper installation: Step flashing installed as one continuous piece instead of individual overlapping sections is a common shortcut that tends to fail.
• Sealant relied on instead of proper flashing: Caulk alone at a wall-roof junction is a temporary fix at best.
• Siding or trim covering the flashing: When siding is installed over step flashing without proper detailing, water can get trapped behind it.
• Corrosion: Metal step flashing can corrode over time, especially in coastal air.

Why This Leak Is Easy to Miss

Because step flashing often sits behind siding or trim, a failure isn’t visible without removing some of that material. Unlike a cracked pipe boot or missing shingle you can spot directly. Interior staining near where an addition or dormer meets the main roof is often the first real clue.

Related Services

For general flashing repair, see shingle and flashing repair. Not sure where the water is coming from? Start with roof leak detection.

Step-Flashing FAQs

Does this only happen on additions and dormers?

Those are the most common locations, but any point where a roof plane meets a vertical wall. Including where a garage or porch roof meets the main house. Relies on the same type of flashing.

Will fixing this require removing siding?

Sometimes, depending on how the original flashing was installed and how much needs to be accessed. Your provider can assess the extent of work needed after inspecting the specific area.

How can I tell if my home has proper step flashing?

It’s often not visible without a close inspection. If you’re seeing staining near a wall-roof junction, that’s a reasonable signal to have it checked rather than trying to visually confirm the flashing type yourself.

Similar flashing failures happen around chimneys. See our chimney flashing guide.