Chimney flashing fails fast in Trenton because the humid subtropical weather brings hot summers that bake sealant and cold winters that make metal expand then crack. I see it every year on the older brick row homes in North Trenton and South Trenton. Cheap crews slap on roof tar or cheap caulk that lasts one season. Proper fix uses 26-gauge galvanized step flashing tucked under each shingle course plus a lead apron at the base. Mercer County does not always pull a permit for small repairs but inspectors still want the work to meet the 2018 IRC flashing rules.
A common failure point shows up around the Trenton Battle Monument area where wind-driven rain hits the north side of chimneys. The counter flashing pulls away from the masonry after years of thermal movement. We chase out the old mortar, slip in new copper or stainless counter flashing, and repoint with type N mortar. Skip this step and water keeps running down the flue liner into the attic. Homeowners in East Trenton call after the first heavy spring rain because the leak shows up right above the fireplace.
Most jobs start with a ladder check from the roof. We mark every rusted nail and lifted shingle, then remove the old flashing without tearing good felt paper. New material goes in with roofing nails every 6 inches and a bead of polyurethane caulk only at the top edge. Access on Cadwalader Park homes can add time because of steep slate sections. The whole repair usually finishes same day unless we hit hidden rot that needs decking replacement.
Call before the next freeze. Once water gets past bad flashing it soaks insulation and turns into ice dams that push more shingles loose. We carry lead, copper, and galvanized stock on the truck so we match whatever is already on the roof in Mill Hill.
Chimney Flashing Repair Services We Offer
✓Emergency Chimney Flashing Repair Trenton NJ
Same-day visit to stop active leaks around the chimney base using stock flashing we carry on the truck.
✓Chimney Flashing Replacement on Slate Roofs
Full removal and new step flashing plus counter flashing on slate roofs common in Chambersburg homes.
✓Commercial Chimney Flashing Repair
Larger masonry chimneys on Mercer County commercial buildings get stainless flashing and sealed joints rated for high wind.
✓Chimney Cricket and Flashing Install
Build a cricket behind wide chimneys then flash it to shed water on steep pitches in South Trenton.
✓Lead Flashing Repair near Historic District
Match original lead step flashing on homes near the New Jersey State House without changing the look.
Chimney Flashing Repair Cost in Trenton, NJ
| Service | Typical Range | What Affects It |
|---|---|---|
| Chimney flashing repair on asphalt shingle roof | $450–$750 | Standard access, galvanized material, no deck damage. |
| Chimney flashing replacement on slate | $650–$1,100 | Extra labor to work around brittle slate and match existing lead. |
| Add copper counter flashing | $150–$300 | Upgrade from galvanized when homeowner wants longer life. |
| Repair rotted decking around chimney | $200–$450 | Price rises with how many sheets need replacement. |
| Free estimate for chimney flashing repair | Free | Call Mon-Sat 7am-7pm or use 24/7 emergency line. |
Ranges are typical for Trenton, NJ and confirmed with an exact written quote before any work starts.
How it works
- 1
Roof inspection and leak tracing
Climb up and check flashing condition plus any rot around the chimney. Takes 30-45 minutes.
- 2
Remove old flashing and clean deck
Cut out rusted metal, lift shingles, and scrape sealant. Usually 1-2 hours.
- 3
Install new step and counter flashing
Slide in 26-gauge galvanized or copper pieces, nail every 6 inches, and seal top edge. 2-3 hours typical.
- 4
Final check and cleanup
Hose test the seam, pick up debris, and walk the customer through what we found. 30 minutes.
Pricing
Typical chimney flashing repair in Trenton runs $450-$1,100 depending on access and material.