How to Fix Roof Flashing Around a Chimney (2026 Cost & Repair Guide)

Chimney flashing is the most common source of roof leaks on homes with chimneys. The point where a masonry chimney meets an asphalt shingle roof is one of the most vulnerable spots on any house — two different materials, moving at different rates, held together by metal and sealant that takes a beating from weather year after year. In Myrtle Beach, chimney flashing repair typically costs $400 to $1,500 depending on the scope of work needed.

If you have water stains on the ceiling near your chimney, damp spots on the wall beside the fireplace, or visible rust and separation around the chimney base, the flashing is almost always the culprit. This guide explains why chimney flashing fails, what each component does, how the repair process works, and what it costs here on the South Carolina coast.

For a broader overview of all flashing types and how they compare, see our complete roof flashing repair guide.

Why Chimney Flashing Fails More Than Any Other Flashing

Chimney flashing is not a single piece of metal. It is a system of multiple components — base flashing, step flashing, counter flashing, and often a cricket — that must all work together to keep water out. That complexity is exactly why chimneys are the number one spot for flashing failures.

Different Expansion Rates Between Brick and Metal

Your chimney is masonry (brick, stone, or block). Your roof is wood framing, plywood sheathing, and asphalt shingles. These materials respond to temperature changes at very different rates. On a summer day in Myrtle Beach, roof surface temperatures can exceed 150°F while the chimney masonry stays cooler. In winter, the dynamic reverses. This constant differential movement gradually works flashing connections loose, breaks sealant bonds, and opens gaps that water exploits.

Mortar Joint Deterioration

Counter flashing on a chimney is set into the mortar joints between bricks. Over time, mortar erodes — especially in coastal South Carolina where salt air and driving rain accelerate the process. When the mortar around the counter flashing crumbles or cracks, the flashing loses its anchor and water runs behind it, directly into the roof system.

Complex Geometry at the Roof-Chimney Junction

A chimney has four sides that all meet the roof differently. The uphill side collects water flowing down the roof. The downhill side must channel water around the chimney base. The two lateral sides need step flashing interwoven with the shingle courses. Each transition point is a potential leak path. No other roof penetration has this many vulnerable joints in such a small area.

Water and Debris Pooling Behind the Chimney

The uphill side of a chimney is a natural collection point for water, leaves, pine needles, and other debris. Without a cricket (saddle) to divert water around the chimney, this material pools against the flashing, holds moisture, and breaks down sealant faster. In the Myrtle Beach area, where live oaks and pines constantly shed debris, this is one of the primary reasons chimney flashing fails prematurely.

Types of Chimney Flashing and What Each One Does

Understanding the components helps you identify which part has failed and what the repair involves.

Chimney Flashing Components

1.Base flashing (apron flashing) — An L-shaped piece of metal that wraps around the bottom (downhill) edge of the chimney where it meets the roof. One leg lies flat on the roof surface under the shingles. The other leg runs up the chimney face. This is the first line of defense and diverts water that flows down the chimney face out onto the roof surface.
2.Step flashing — A series of L-shaped metal pieces installed along the sides of the chimney where it meets the sloping roof. Each piece overlaps the one below it and is interwoven with the shingle courses, creating a stair-step water barrier. If one step flashing piece fails, water enters at that exact point and runs down the inside of the roof.
3.Counter flashing — Metal pieces embedded into the chimney mortar joints that fold down over the top edges of the step flashing and base flashing. The counter flashing covers the exposed top edge of the base and step flashing so water cannot get behind them. This is the component most often associated with chimney leaks because it relies on the mortar joint to stay sealed.
4.Cricket (saddle) — A small peaked structure built on the uphill side of the chimney. It diverts water and debris around the chimney instead of letting it pool against the back wall. Building codes require a cricket when the chimney is wider than 30 inches perpendicular to the roof slope. Even on smaller chimneys, a cricket prevents the debris buildup that causes premature flashing failure.

All four components must work together. When a roofer says “the chimney flashing needs replacing,” they typically mean most or all of these components need to come off and be reinstalled with new metal and fresh sealant.

Signs Your Chimney Flashing Has Failed

Chimney flashing leaks do not always produce an obvious drip. Water often travels along rafters and sheathing before showing up somewhere else. Here is what to look for.

Interior Warning Signs

• Water stains on the ceiling near the chimney
• Damp or discolored drywall on the wall beside the fireplace
• Musty smell near the fireplace or in the attic near the chimney chase
• Peeling paint or bubbling wallpaper near the chimney wall
• Mold growth on attic rafters or sheathing near the chimney opening

Exterior Warning Signs

• Visible rust streaks on the flashing metal
• Gaps between the counter flashing and the chimney bricks
• Crumbling mortar around the counter flashing edges
• Lifted, bent, or missing step flashing pieces
• Dried, cracked, or missing sealant along flashing edges
• Debris buildup behind the chimney (no cricket or failed cricket)

If you notice any of these signs, address them promptly. A chimney flashing leak that runs for months can damage the roof decking, attic insulation, rafters, and interior walls — turning a $400 flashing repair into a $2,000 to $5,000 remediation project. Our Myrtle Beach roof repair team can inspect and diagnose chimney flashing issues quickly.

Chimney Flashing Repair: Step-by-Step Process

Here is what a professional chimney flashing repair looks like from start to finish. The exact scope depends on which components have failed, but a full chimney reflashing follows this sequence.

1. Inspection and Leak Tracing — The roofer inspects the chimney flashing from outside and checks the attic from inside, tracing the water path to confirm exactly where water is entering. The visible stain on the ceiling is often 3 to 6 feet from the actual entry point because water travels along rafters before dripping.
2. Remove Shingles Around the Chimney — The shingles surrounding the chimney on all affected sides are carefully lifted or removed to expose the existing flashing. An experienced roofer saves reusable shingles for reinstallation.
3. Remove Old Flashing and Sealant — The failed flashing components (step flashing, base flashing, counter flashing) are removed. Old sealant is scraped away from both the chimney masonry and the roof decking. The mortar joints where counter flashing was embedded are cleaned out.
4. Inspect and Repair the Decking — With the flashing removed, the roofer inspects the plywood or OSB sheathing around the chimney for water damage. Soft, rotted, or delaminated wood is cut out and replaced. This step is critical — installing new flashing over damaged decking leads to a repeat failure.
5. Install Ice and Water Shield — A self-adhering waterproof membrane (ice and water shield) is applied to the decking around the chimney as a secondary water barrier. This is especially important in coastal areas where wind-driven rain can push water under even properly installed flashing.
6. Install New Base Flashing — The apron flashing is fitted along the downhill face of the chimney, with one leg extending onto the roof deck under where the shingles will go and the other leg running up the chimney face.
7. Install Step Flashing — Individual L-shaped step flashing pieces are placed along each side of the chimney, interwoven with the shingle courses. Each piece overlaps the one below it by at least 2 inches. This stair-step layering is what directs water away from the chimney at each shingle course.
8. Install or Repair the Cricket — If the chimney is 30 inches or wider (or if there is no existing cricket), a cricket is built on the uphill side. The cricket is framed, sheathed, and covered with metal flashing or membrane to create a peaked diverter that pushes water around the chimney.
9. Install Counter Flashing — New counter flashing is cut into the cleaned mortar joints of the chimney using a grinder. The metal is embedded at least 1 to 1.5 inches deep, then the joint is sealed with high-quality polyurethane sealant. The counter flashing folds down over the top edge of the step and base flashing, completing the two-layer water barrier.
10. Seal, Reinstall Shingles, and Test— All flashing edges are sealed with roofing sealant rated for UV and temperature extremes. Shingles are laid back over the flashing in the correct overlapping pattern. A water test (running a hose over the chimney area) confirms the repair holds before the crew cleans up.

A full chimney reflashing takes most of a day for a two-person crew. Partial repairs (resealing counter flashing or replacing a few step flashing pieces) take 2 to 4 hours.

Chimney Flashing Repair Cost in Myrtle Beach

Costs vary based on the scope of work, the flashing material chosen, and whether the decking needs repair. Here is what to expect in the Myrtle Beach area.

Repair Type	Cost Range	What It Includes
Reseal existing flashing	$200 – $400	Remove old sealant, apply new roofing sealant to all flashing edges and counter flashing joints
Partial flashing replacement	$400 – $800	Replace failed step flashing or counter flashing on one or two sides, reseal remaining components
Full chimney reflashing	$800 – $1,500	Remove all existing flashing, install new base, step, and counter flashing on all four sides, repair or install cricket
Cricket installation (new)	$300 – $600	Frame, sheath, and flash a new chimney cricket on the uphill side (often included in full reflashing)
Decking repair (if needed)	$300 – $1,000+	Replace water-damaged plywood or OSB sheathing around the chimney before new flashing goes on

For coastal Myrtle Beach homes, we recommend aluminum or copper flashing for chimney work. Galvanized steel is cheaper upfront but corrodes faster in salt air, leading to repeat repairs within 10 to 15 years. Aluminum adds about 15 to 20 percent to the material cost but lasts significantly longer near the coast.

When the Chimney Cricket Needs Repair or Installation

The chimney cricket is one of the most overlooked components of chimney flashing, but it plays a critical role in preventing leaks. Here is when you need to address it.

You Need a Cricket When:

•Your chimney is 30 inches or wider perpendicular to the roof slope (required by building code)
•You have recurring leaks behind the chimney even after flashing repairs
•Debris constantly accumulates on the uphill side of the chimney (leaves, pine needles, granules)
•Your roof has a low slope where the chimney sits, creating slower water drainage
•You are getting a full chimney reflashing and there is no existing cricket — it is worth adding while the area is already open

A cricket adds $300 to $600 when installed alongside a reflashing job. As a standalone project it costs more because the roofer still needs to remove and reinstall surrounding shingles and flashing to integrate the cricket properly. If you are already paying for chimney flashing work, adding a cricket at the same time is significantly cheaper than doing it later.

Chimney Flashing in Coastal South Carolina: What to Know

Myrtle Beach and the Grand Strand area present unique challenges for chimney flashing that inland homeowners do not face.

•Salt air corrodes flashing metal faster. Galvanized steel flashing near the coast can show heavy rust in 10 to 15 years. Homes within a mile of the ocean should use aluminum or copper flashing for chimney work.
•Hurricane winds test every connection. Counter flashing that is not embedded deep enough into mortar joints can be peeled back by 100+ mph winds. In Horry County, chimney flashing must meet wind resistance standards for the local design wind speed.
•Mortar deteriorates faster near the coast. The combination of salt spray, humidity, and driving rain erodes chimney mortar joints more aggressively than in inland areas. When the mortar around counter flashing fails, the flashing comes loose.
•Spring inspection timing matters. The best time to repair chimney flashing in Myrtle Beach is March through May, before hurricane season starts in June. This gives you a solid seal heading into the storm months.

Frequently Asked Questions About Chimney Flashing Repair

How much does chimney flashing repair cost?

Chimney flashing repair in Myrtle Beach typically costs $400 to $1,500. A simple reseal of existing flashing runs $200 to $400. Partial replacement of step flashing or counter flashing costs $400 to $800. Full chimney reflashing with new base flashing, step flashing, counter flashing, and a cricket runs $800 to $1,500. If the roof decking around the chimney has water damage, add $300 to $1,000 for wood replacement.

Why does chimney flashing leak more than other flashing?

Chimney flashing is the most complex flashing assembly on any roof. It involves multiple components (base flashing, step flashing, counter flashing, and often a cricket) that must work together. The chimney is masonry and the roof is wood and asphalt — these materials expand and contract at different rates with temperature changes, which gradually breaks the seal. The mortar joints that hold the counter flashing also deteriorate over time, especially in coastal areas where salt air accelerates erosion.

What is a chimney cricket and do I need one?

A chimney cricket (also called a saddle) is a small peaked structure built on the uphill side of a chimney to divert water and debris around it. Building codes typically require a cricket when the chimney is wider than 30 inches measured perpendicular to the roof slope. Even on narrower chimneys, a cricket is a good investment because it prevents water and leaf debris from pooling behind the chimney — one of the most common causes of chimney flashing leaks.

Can I fix chimney flashing myself?

Minor sealant touch-ups on chimney flashing edges are possible for a handy homeowner. However, replacing chimney flashing is not a DIY job. It requires removing surrounding shingles, cutting and fitting new step flashing pieces interwoven with the shingle courses, embedding counter flashing into mortar joints, and properly waterproofing the cricket. Incorrect chimney flashing installation can make leaks worse by redirecting water into the decking. A professional roofer with chimney flashing experience is the safer choice.

How long does chimney flashing last in coastal South Carolina?

The metal itself lasts 15 to 30 years depending on the material — galvanized steel on the shorter end, aluminum in the middle, and copper lasting 40 years or more. However, the sealant and mortar joints around chimney flashing typically fail within 5 to 10 years, especially in Myrtle Beach where salt air, UV exposure, and hurricane-force winds accelerate deterioration. Annual inspections and resealing every 5 to 7 years extend the effective life significantly.

The Bottom Line on Chimney Flashing Repair

Chimney flashing is the most failure-prone spot on any roof. The combination of complex geometry, different materials expanding at different rates, and constant exposure to weather makes it inevitable that chimney flashing will need attention during the life of your roof.

The good news is that chimney flashing repair is a well-understood job for an experienced roofer. A full reflashing costs $800 to $1,500 — and prevents the thousands of dollars in water damage that an unaddressed leak can cause over months or years.

For Myrtle Beach homeowners, the priority is catching problems early (annual inspections before hurricane season) and using corrosion-resistant materials (aluminum or copper) that can handle the coastal environment. If you are seeing any signs of chimney flashing failure, getting it inspected now is always cheaper than waiting. Need help with a roof leak repair? We are available for same-day emergency service.

Need Chimney Flashing Repair in Myrtle Beach?

WeatherShield Roofing specializes in chimney flashing repair and replacement for homes along the Grand Strand. We use corrosion-resistant materials built to handle the coastal environment. Free inspections available. SC License #124773.

Call (843) 877-5539 Get a Free Estimate

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How to Fix Roof Flashing Around a Chimney