Chimney Flashing Repair

Chimney flashing is the layered metal system that seals the joint where your chimney passes through the roof. Because that joint mixes two very different materials, masonry and roofing, it can never be sealed with shingles alone. A proper system uses several parts working together.

• Base or apron flashing: the front piece that carries water away from the low side of the chimney.
• Step flashing: individual metal pieces woven into each shingle course along the chimney sides.
• Counter flashing: the cap layer set into the masonry mortar joints that overlaps the step flashing so water can never get behind it.
• Saddle or cricket: a small peaked structure on the high side of wide chimneys that splits water and snow around the chimney instead of letting it pile up.

When all four parts are installed and lapped correctly, water is shed away from the chimney every time. When even one part is wrong or worn, the chimney becomes an open door for leaks. This is a specialized job that differs from the general roof flashing repair we perform around vents, skylights, and walls.

Ask any roofer where leaks start and the chimney comes up first. It sits at a break in the roof plane, it holds snow and ice against it, and it depends on many small metal pieces staying perfectly sealed for decades. In Wisconsin, freeze-thaw cycles push and pull on everything. Water finds a hairline gap, freezes overnight, expands, and widens that gap a little more each cycle. Ice dams make it worse by forcing meltwater uphill and under the flashing. Add heavy snow load and summer storms, and the chimney takes more abuse than almost any other part of the roof. That is why a chimney that looked fine last year can suddenly leak, and why we treat chimney flashing as a priority during every free roof inspection.

Flashing does not fail randomly. There are a handful of predictable causes we see across Northeast Wisconsin.

Chimney leaks usually announce themselves indoors before you ever see damage on the roof. Watch for these warning signs.

• Ceiling or wall stains near the chimney, often brown rings that grow after rain or snowmelt.
• A damp, musty attic or visible water tracks on the framing around the chimney chase.
• White chalky efflorescence on the chimney brick, a sign that water is soaking through the masonry.
• Active drips or trickles during heavy rain or a spring thaw.
• Rust streaks or lifted, gapped metal visible where the chimney meets the shingles.

If you notice any of these, it is worth acting quickly. A slow chimney leak can rot decking and framing long before it shows on the ceiling. When water is actively coming in, our emergency roof leak repair team can stop the damage fast, and storm-driven flashing failures may fall under storm damage coverage.

Not every chimney needs a complete reflash. When the metal is sound and the problem is isolated, a targeted repair to reseal a joint or replace a single damaged piece can solve it. But when flashing is rusted, caulk-dependent, or was never set into the masonry, a full reflash is the honest fix. We remove the old flashing, install new step and base flashing woven into the shingles, cut fresh reglets and set counter flashing into the mortar, and add a cricket where the chimney width calls for one. The result is a system that sheds water on its own rather than leaning on sealant. If the surrounding roof is aging too, we will tell you plainly whether flashing work makes sense or whether a broader roof repair or roof replacement is the smarter long-term move. Owner Michael Pierce brings more than 30 years of experience to that call, and every recommendation comes with a free inspection and no pressure.