📋 In This Guide
Chimney flashing is responsible for more roof leaks in Connecticut than any other single component — outpacing missing shingles, aged underlayment, and even ice dams. Yet most homeowners have never heard of it. If you see a water stain near a fireplace wall or ceiling, failed flashing is the most likely culprit.
What Is Chimney Flashing and Why Does It Fail?
Chimney flashing is the waterproofing system where your chimney meets your roof. It consists of two layers:
Step Flashing — Individual L-shaped metal pieces woven between each shingle course as they travel up the chimney's sides. Directs water sideways off the chimney and onto the shingles below.
Counter Flashing — Metal pieces cut into the chimney mortar joints and folded down over the step flashing. Prevents water from traveling behind the step flashing and into the house.
Why it fails in Connecticut:
Step Flashing — Individual L-shaped metal pieces woven between each shingle course as they travel up the chimney's sides. Directs water sideways off the chimney and onto the shingles below.
Counter Flashing — Metal pieces cut into the chimney mortar joints and folded down over the step flashing. Prevents water from traveling behind the step flashing and into the house.
Why it fails in Connecticut:
- Freeze-thaw cycling — Connecticut's winters cause repeated expansion/contraction that works mortar out of joints, allowing counter flashing to pull free
- Poor original installation — Many CT roofers use caulk instead of proper cut-in counter flashing. Caulk fails within 3–7 years
- Galvanic corrosion — Aluminum flashing against copper or steel elements creates electrolytic corrosion
- Age — Most aluminum flashing has a 15–20 year lifespan. Many Connecticut homes have flashing far older than this
Signs of Failed Chimney Flashing in CT Homes
Interior signs:
- Water stains on walls or ceiling near the fireplace or chimney
- Peeling paint or wallpaper near chimney walls
- Musty smell in rooms adjacent to chimney
- Daylight visible around chimney from inside attic
- Visible gap between flashing metal and chimney brick
- Rust staining on chimney brick below the roofline
- Bubbling or lifting paint on siding near chimney
- Caulk used as "flashing" — black blobs at the chimney/roof junction
Chimney Flashing Repair vs. Replacement: Which Do You Need?
| Situation | Repair or Replace? | CT Cost Range |
|---|---|---|
| Counter flashing lifted from mortar joints | Repair — re-bed in new mortar | $350 – $700 |
| Single section of step flashing damaged | Repair — replace section | $300 – $600 |
| Caulk "flashing" throughout | Replace — full step + counter install | $900 – $2,200 |
| Rusted/corroded aluminum flashing | Replace — upgrade to copper | $1,200 – $2,800 |
| Flashing intact but chimney mortar failed | Repoint mortar — re-bed counter flashing | $600 – $1,500 |
Fix Your Chimney Flashing — Stop the Leak Today
Masonry Next performs chimney flashing repairs and full replacements across Connecticut. Same-week service available, free inspection included, and written warranty on all flashing work.
About Masonry Next: Connecticut's masonry contractor for chimney repair, brick pointing, and foundation restoration. Serving all Connecticut cities and towns since 2014. Free inspections, insurance claim assistance, and written warranties on every job.
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