Base flashing repair or replacement
The metal flashing that lies under and over the shingles at the chimney base. If corroded or bent, it is replaced. This requires removing and replacing shingles, which is labor-intensive.
Serving Gloucester County
Chimney Flashing Repair: Base Flashing, Counter-Flashing, and Mortar Sealing
Comprehensive chimney flashing repair addressing base flashing, counter-flashing, and mortar joints.
- Roof repair and full replacement
- Hurricane wind, leaks and fallen-tree damage
- Gloucester County and the Middle Peninsula
Get a fast quote
Fastest: call (833) 751-2102. Or send this and we call you back.
Chimney Flashing
Chimney Flashing Repair: what it covers
Quick answer
Gloucester Roofing connects you with roofers experienced in chimney flashing repair. A chimney is unique: masonry that moves, metal flashing underneath and lapped into the mortar, and sealant joints that degrade. Proper repair requires coordination of both roofing and masonry. Call (833) 751-2102.
A chimney on the roof is a complex flashing detail: metal base flashing lies under the shingles on the uphill side and over them on the downhill side, overlapping in both directions to shed water. Separate counter-flashing is tucked into the mortar joints of the chimney and sealed with caulk. When either fails, water enters fast.
The complexity is why chimney flashing is a leak-prone detail. The masonry and the metal flashing move at different rates with temperature and settling. Mortar between the chimney and flashing cracks. Sealant dries and fails. Each movement breaks the seal and invites water in.
Repair requires both roofing and masonry skills. A roofing-only view will miss mortar failure; a masonry-only view will miss flashing issues. The best roofers on the Middle Peninsula understand both.
- Service area
- Gloucester & Gloucester County
- Availability
- Phones answered 24/7
- Typical cost
- $200-400 (estimate)
- Phone
- (833) 751-2102
Warning signs
Signs you need chimney flashing repair
Do not climb onto a roof to work on chimney flashing. It is high and complex. A professional roofer with masonry coordination should handle it.
- Water staining on the ceiling next to or below the chimney
- Rust streaks or green corrosion on the outside of the chimney
- Visible cracks in the mortar between the chimney and flashing
- Mortar that is crumbling or missing from chimney joints at or near the roof
- Sealant that is cracked, separated, or missing where the flashing meets the chimney
- A musty smell in the attic near the chimney, suggesting hidden moisture
Cost
How much does chimney flashing repair cost in Gloucester?
Chimney flashing repair is usually more expensive than general roof flashing because of the masonry involved. A small sealant or counter-flashing repair might run $300-500; a full replacement can run $1,500 to $3,000 or more.
| Job | Typical range | What it includes |
|---|---|---|
| Recaulking failed sealant at chimney-flashing junction | $200-400 | If the flashing is sound but sealant is cracked |
| Counter-flashing replacement and sealing | $500-1,000 | Replacing the metal counter-flashing and sealing it into the mortar |
| Base flashing repair or replacement | $500-1,500 | Requires removing and replacing shingles, so labor-intensive |
| Mortar repointing by a mason | $500-1,500 depending on extent | Replacing failed mortar joints; this is masonry work |
| Full chimney flashing replacement (roofing + masonry) | $2,000-4,000 or more | Comprehensive repair of flashing, counter, mortar and shingles |
Chimney flashing repair often requires coordination between a roofer and a mason. Get separate quotes and coordinate the work timing.
Options
Types and options for chimney flashing repair
Counter-flashing replacement
The separate metal flashing that is inserted into the chimney mortar and overlaps the base flashing. If missing or corroded, it is replaced and sealed. Proper counter-flashing is critical.
Mortar repointing and sealant application
Crumbling or cracked mortar between the chimney and flashing is repointed with new mortar. Sealant is applied in cracks to prevent water entry. This is masonry work, often contracted separately from the roofing.
Full chimney flashing replacement
When base, counter, mortar and shingles around the chimney are all failing, a complete replacement is often more cost-effective than piecemeal repair. This is a substantial job involving both roofing and masonry.
One call and it gets handled.
Most chimney flashing repair calls are scheduled the same day when a technician is free, and you approve the price before any work starts.
What is the difference between base flashing and counter-flashing?
Base flashing lies directly under and over the shingles, and it is the first layer of protection. Counter-flashing is a separate piece that is inserted into the chimney mortar and overlaps the base flashing to direct water down and away. Both are needed for a complete chimney detail.
If the base flashing fails and counter-flashing is missing or broken, water gets in quickly. The counter-flashing should overlap the base flashing and be sealed where they meet.
Old chimneys sometimes have only base flashing and no counter-flashing, which is a weak detail. Upgrading to full counter-flashing adds cost but prevents many leaks.
Why does mortar crack at the chimney-roof junction?
The chimney is masonry that expands and contracts with temperature. The flashing is metal that expands and contracts at a different rate. The junction moves constantly, stressing the mortar. Also, mortar ages and deteriorates over decades. Cracks form and water enters.
Repointing (replacing the mortar) is a necessary maintenance step every 10-20 years, depending on the age and exposure of the chimney.
Sealant applied over the mortar also needs replacement every 5-10 years. Neither is permanent; maintenance is required.
Can chimney flashing last as long as the chimney?
No. Flashing usually lasts 25-35 years; a chimney can last 100+ years. As the roof is replaced, the flashing should be upgraded. A 50-year-old flashing that is corroded should not be reused on a new roof.
When you have a roof replaced, ask the roofer whether the chimney flashing should be replaced too. Often, it is worth upgrading at the same time rather than having a roofer return in 5 years to replace the flashing.
Should I hire a roofer or a mason for chimney flashing repair?
Both. A roofer handles the roof-side flashing, shingles, and base flashing. A mason handles mortar repointing and counter-flashing installation. Ideally, coordinate a single contractor who has both skills, or have a roofer and mason work together.
If a roofer says they will handle the whole chimney repair, ask whether they are also handling mortar repointing or whether they expect a mason to do that. Clear coordination prevents gaps and rework.
The best outcome is a roofer and mason working from a shared plan.
What happens if I ignore a chimney flashing leak?
Water accumulates in the attic and walls around the chimney, rotting decking and framing, soaking insulation, and creating conditions for mold growth. Structural damage spreads and becomes expensive to repair. A leak that starts as a water stain becomes a structural problem within a few years.
Address chimney flashing leaks quickly. The repair cost is much less than the water damage cost if you wait.
Our process
How our chimney flashing repair visit works
Inspect from inside the attic and outside the roof
The roofer climbs into the attic to see if water has been entering around the chimney. Outside, they look at the base flashing, counter-flashing, and mortar joints to identify the failure point.
Identify whether the problem is flashing, mortar, or both
The roofer traces the leak path. Is water coming in under the flashing, or is it getting in through cracks in the mortar? Usually, both are involved.
Plan the repair scope
Repair may involve removing shingles to access base flashing, removing old counter-flashing, repointing mortar joints, replacing or reseal ing flashing, and reinstalling or upgrading counter-flashing.
Execute the repair with proper sequencing
Base flashing is installed and sealed first. Shingles are laid over the uphill portion. Counter-flashing is installed and sealed. The repair is tested by spraying water or waiting for rain.
Seal mortar joints to prevent future failure
New mortar joints or sealant are applied to prevent water from entering the mortar cracks. This is maintenance that extends the repair life.
Gloucester County
Why chimney flashing repair is different in Middle Peninsula
Chimneys on older Gloucester homes are common and often have original flashing that is corroded and failing. When a roof is replaced, upgrading the chimney flashing is a good investment to prevent future leaks.
Salt air on the Middle Peninsula accelerates corrosion of chimney flashing metals. An asphalt roof with 15-20 years of life remaining may have chimney flashing that is already failing. Inspection and upgrade are wise before the roof is replaced.
The proximity of the chimney to the roof ridge (high point of the roof) means wind and rain are intense at that junction. Flashing here is under constant stress and requires attention.
Where we work
Chimney Flashing Repair across Gloucester County
- Chimney Flashing in Gloucester
- Chimney Flashing in Gloucester Point
- Chimney Flashing in Severn
- Chimney Flashing in Ark
- Chimney Flashing in White Marsh
- Chimney Flashing in Ware Neck
- Chimney Flashing in Hayes
- Chimney Flashing in Achilles
- Chimney Flashing in Bena
- Chimney Flashing in Mathews
- Chimney Flashing in Yorktown
- Chimney Flashing in Deltaville
- Chimney Flashing in Port Haywood
- Chimney Flashing in Hartfield
- Chimney Flashing in Schley
- Chimney Flashing in Dutton
- Chimney Flashing in Wicomico
- Chimney Flashing in Ordinary
- Chimney Flashing in Woods Cross Roads
- Chimney Flashing in Maryus
- Chimney Flashing in Cobbs Creek
- Chimney Flashing in Saluda
Not sure if you're covered? Check your ZIP code.
Related
Related services
Roof Flashing Repair
Expert flashing repair at valleys, chimneys, vents and walls where roof components meet and water enters.
Roof Repair
Spot repairs to valleys, flashing, shingles and dormer joints, arranged through one call to Gloucester Roofing and carried out by a local technician.
Roof Replacement
A strip to the deck and a complete new roof, arranged through one call to Gloucester Roofing and carried out by a local technician.
Emergency Roof Leak Repair
Immediate roof leak repair and tarping service to stop water damage in your home, available day and night.
FAQ
Chimney Flashing Repair FAQs
Can a chimney flashing leak be patched temporarily?
Maybe with roofing cement or caulk, but that is not a real repair. Plan for a proper replacement within a season. Temporary patches fail quickly.
Do I need to use the chimney while flashing repair is happening?
No. A chimney that is leaking should not be used until the leak is fixed. Water coming down the chimney can damage the interior.
What if the chimney is cracked, not just the flashing?
Chimney cracks are a masonry issue, not a flashing issue. A mason should assess chimney structural integrity. Water may be entering through cracks in the chimney itself, not just the flashing.
Can a new roof be installed without replacing the chimney flashing?
Technically yes, but not recommended. If the chimney flashing is more than 15-20 years old, replacing it at the same time saves a roofer trip in a few years.
Why is my chimney flashing getting green corrosion?
Green corrosion is copper oxide or patina, which develops on copper or copper-aluminum flashing. It is not damaging unless the flashing is worn thin. The color is aesthetic but does not mean the flashing is failing yet.
How often should chimney flashing be inspected?
Annually, and especially after a storm or wind event. Chimney flashing is under constant stress from temperature movement and water exposure, so regular inspection catches problems early.