Chimney Crown Repair in Nassau County
The chimney crown is the concrete slab that seals the top of your chimney masonry around the flue liner opening. A properly built crown slopes away from the flue to direct water off the chimney. Many Nassau County homes — especially those built in the 1940s–1970s — have incorrectly built crowns: too thin, with vertical edges instead of overhangs, or made with mortar instead of concrete. These crowns crack within years. Once cracked, every rain event sends water directly into the chimney structure, deteriorating liner, mortar, and brick from the inside. Crown repair or replacement stops this immediately.
Crown recoating with elastomeric crown seal (cracks under 1/4")
Partial crown repair for moderate damage
Proper overhang and drip edge formed on rebuild
Crown work warranted — ask for details
How Chimney Crown Repair Works
Assess crown condition from the roof
We inspect the crown for cracking, spalling, and separation from the flue tile. Minor cracks can be recoated; severely deteriorated crowns require rebuilding.
Clean and prepare the surface
The crown is cleaned of loose debris, efflorescence, and failed material. Clean contact surfaces are essential for the repair to bond properly.
Apply repair mortar or rebuild
Hairline cracks are filled and sealed. Moderate cracking receives a full recoat. Severely failed crowns are rebuilt with proper drip edge geometry to direct water away from the masonry.
Apply ChimSaver waterproofing
ChimSaver breathable sealant is applied to the repaired crown and surrounding masonry. It blocks water infiltration while allowing moisture vapor to escape — preventing trapped moisture damage.
What Customers Say
Rachel Levine
Garden City • October 2025
“Documented the crown condition with photos before and after.”
★★★★★Kenneth Smith
Bayville • April 2025
“Recoated the crown and applied waterproofing same visit. Efficient.”
★★★★★Sinead Mullen
Bayville • July 2024
“Honest assessment — said I could recoat now rather than full rebuild.”
★★★★★Frequently Asked Questions
What is a chimney crown and what does it do?
The chimney crown is the concrete slab at the top of your chimney that seals the brick from rain. A properly built crown with an overhang directs water away from the masonry. Pair crown repair with a chimney cap and waterproofing for complete top protection.
How much does chimney crown repair cost in Nassau County?
DME Maintenance charges from $395 for chimney crown repair in Nassau County. Severely deteriorated crowns require demolition and rebuild, quoted on-site after inspection.
Can I repair a chimney crown myself?
Homeowners sometimes apply crown sealant products, but improper application on a structurally cracked crown fails within one freeze-thaw cycle. DME Maintenance uses commercial-grade materials with proper surface prep. After repair, ChimSaver waterproofing extends the life of the repair significantly.
How is a chimney crown different from a chimney cap?
The crown is the concrete or mortar slab that covers the top of the chimney masonry, with the flue tile(s) extending through it. The cap sits on top of the flue tile(s) to keep rain and animals out of the flue. Both can fail independently. Failed crowns let water into the masonry; failed caps let water and animals into the flue.
Can a chimney crown be repaired or does it need to be replaced?
Minor cracking — hairline cracks and surface deterioration — can be repaired with elastomeric sealant and extended with ChimSaver waterproofing. Crowns that have cracked through, separated from the flue, or crumbled at the edges need to be rebuilt. DME Maintenance assesses the specific condition on-site.
Quick Answers
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Nassau County Pricing Guide
| Service | Starting Price |
|---|---|
| Chimney Cleaning (Gas or Oil Flue) | $165 |
| Chimney Inspection (Level 1) | $165+ |
| Gas Chimney Cleaning Nassau County NY | $165 | Licensed | $165 |
| Oil Chimney Cleaning Nassau County NY | $165 | Same Week | $165 |
| Wood Fireplace Chimney Sweep | $249+ |
| Gas Fireplace Cleaning Nassau County NY | $175+ | Licensed | $175+ |
| Wood Stove Cleaning Nassau County NY | $195+ | Same Week | $195+ |
| Pellet Stove Cleaning Nassau County NY | $195+ | Licensed | $195+ |
| Chimney Blockage Removal Nassau County NY | Same Day Service | Free estimate |
| Chimney Repair / Blockage / Waterproofing | Free estimate |
| Chimney Cap Installation | $255+ |
| Chimney Crown Repair | $395+ |
| Chimney Chase Cover Nassau County NY | Custom Steel | Free Estimate | Free estimate |
| Chimney Pointing | $600+ |
| Chimney Waterproofing Nassau County NY | ChimSaver | Free Estimate | Free estimate |
| Prefab Chimney Service Nassau County NY | Repair & Replacement | Free estimate |
| Stainless Steel Chimney Liner | $1,670+ |
| Level 2 Inspection (Home Sale) | Free estimate |
| Emergency Chimney Service | Free estimate |
| Chimney Damper (Top-Sealing) | $999+ |
| Dryer Vent Cleaning | $149+ |
| Chimney Flashing Repair Nassau County NY | Stops Leaks | Free Estimate | Free estimate |
| Carbon Monoxide & Your Chimney Nassau County NY | Safety Inspection | Free estimate |
| Smoke Coming Into House Nassau County NY | Same-Week Diagnosis | Free estimate |
| Chimney Smell in House Nassau County NY | Odor Diagnosis | Free estimate |
| Chimney Leaking Water Nassau County NY | Diagnosis & Repair | Free estimate |
| Fall Chimney Cleaning Nassau County NY | Book Now | $165+ | $165+ |
| Chimney Service Cost Guide Nassau County 2026 | Real Prices | $149–$1,670+ |
| Power Washing Nassau County NY | Driveways, Decks, Siding | $175+ |
| Oil to Gas Chimney Conversion Nassau County NY | Liner Required | $1,670+ |
| Chimney Rebuild Nassau County NY | Partial & Full | Free Estimate | $1,200+ |
| Animals in Chimney Nassau County NY | Removal & Cap Install | $255+ |
| Chimney Inspections for Real Estate Agents — Nassau County NY | Free estimate |
Prices are starting rates. Free on-site estimates for all repair work. Call 516-690-7471.
Chimney Crown Repair Nassau County NY | From $395 | Free Estimate — Free On-Site Estimate
Same-week appointments • Written inspection report • Nassau License #H0101570000