Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Before
After
Before
After
Before
AfterDuraFlex Crown Repair: The New Rochelle Owner’s Guide
DuraFlex crown repair in New Rochelle typically runs $280-$520 installed, depending on flue diameter and whether the chase top needs resealing. We stock DuraFlex-compatible crown components for 5-inch through 8-inch liners on our trucks, and most replacements are completed in a single visit. You will usually discover the problem after a hard rain, when water starts dripping into the firebox or you notice rust streaks on the exterior brick that were not there last season.
Which DuraFlex Models This Applies To
DuraFlex crowns are not universal. The part you need depends on which DuraFlex series is running through your flue: the 316Ti stainless flexible liner (most common in New Rochelle homes built 1920-1960) or the heavier-duty AL29-4C alloy used with high-efficiency gas appliances. The crown itself, sometimes called a chase cover or termination cap, must match the liner diameter exactly - a 6-inch liner takes a 6-inch crown, and a 6 5/8-inch collar will not seal properly no matter how much caulk you apply.
To identify your part, look for the stamped DuraFlex label on the liner itself, usually visible from the firebox with a flashlight or from the roofline if the crown is already lifted. The label shows the series (316 or AL29) and the nominal diameter. If the label is corroded off, measure the liner outer diameter with a tape measure - not the flue opening, the actual flexible pipe. We carry both OEM DuraFlex termination assemblies and quality aftermarket equivalents from Olympia Chimney that match the spec at a lower price point. For most New Rochelle homeowners with standard 316Ti systems, the aftermarket crown performs identically and carries the same 15-year corrosion warranty in our salt-air climate.
Signs Your DuraFlex Crown Repair Is Failing
- Water in the firebox after rain. The crown’s seal against the flue tile or chase top has cracked, or the internal collar has rusted through. DuraFlex crowns use a stainless collar that can pit from the inside out, especially if the chimney has been venting unlined gas exhaust before the flexible liner was installed.
- Rust streaks down the chimney exterior. This means water is getting past the crown and running down the outside of the liner, carrying rust from the steel chase cover or the crown’s own hardware. In New Rochelle’s coastal environment, this accelerates once the factory powder coat is breached.
- Visible gaps or lifting at the crown perimeter. The caulking bead between the crown and the chimney chase has failed, or the crown was never properly counter-flashed. Wind-driven rain from Long Island Sound will find this gap every time.
- Musty or sour smell from the fireplace in summer. Water is pooling on the smoke shelf, usually because the crown is admitting moisture that the chimney’s natural draft cannot evacuate in warm weather. This is often the first sign owners notice, months before visible water appears.
- Birds or squirrels nesting at the chimney top. A failed crown may have detached entirely or left an opening large enough for wildlife. The DuraFlex crown includes a mesh spark arrestor; if that screen is collapsed or missing, the crown assembly needs replacement, not just repair.
Replacement Cost & What’s Included
In New Rochelle, a complete DuraFlex crown replacement runs $280-$520 for the installed assembly. The lower end covers a straightforward swap on a 5-inch or 6-inch liner with good roof access and a sound chase top. The upper end applies to 8-inch liners, chase tops that need resealing or minor reframing, or jobs where we need to remove a damaged rain pan to reach the crown.
That price includes the crown assembly (stainless collar, cap, and spark arrestor), high-temp silicone sealant rated to 500°F, labor to remove the failed unit and install the replacement, and a Level-2 camera inspection to confirm the liner is intact above the firebox. We photograph everything and give you the images with a plain-English verdict. The 90-Day Done Right Promise covers the installation in writing - if it leaks, we come back. No arguing, no paperwork to dig up.
DIY or Call Us?
You can safely check whether water is coming from the crown versus the flashing or brickwork - run a hose on the roof section by section while someone watches the firebox. But replacing a DuraFlex crown involves working at height on a sloped or flat roof, handling a metal assembly with sharp edges, and sealing it with materials that must survive 300°F-plus flue temperatures. The wrong sealant melts and drips into the firebox; the wrong crown diameter creates a gap that invites carbon monoxide into the chase cavity. We are not affiliated with DuraFlex, but we have installed their components since the brand entered the market, and we know which aftermarket crowns match their spec and which ones fail in two winters. For the cost of a single fall or a botched seal, the call to (516) 927-2678 is the cheaper option.
FAQs
How long does a DuraFlex crown last in New Rochelle?
A properly installed DuraFlex crown typically lasts 12-18 years in our climate. Salt air and freeze-thaw cycles shorten that to the low end if the crown faces south or west with no tree cover. Call (516) 927-2678 for an exact quote - estimates are free.
Can the crown be repaired instead of replaced?
Minor sealant gaps can be patched if the crown metal is sound and the collar is not rusted. Once the collar pits through or the spark arrestor mesh detaches, replacement is the only lasting fix. We will show you the camera image and tell you which category you are in.
How long does the swap take?
Most DuraFlex crown replacements take 90 minutes to two hours from ladder set to final photo. Jobs requiring chase top work or liner extraction add time, but we still complete most in a single visit. We will give you a firm time estimate when you call.
Do you stock DuraFlex crowns on the truck?
We carry 5-inch through 8-inch crowns for both 316Ti and AL29-4C liners, including the common New Rochelle sizes. If your system is an unusual diameter or an older DuraFlex series, we order it and return within 48 hours. Call (516) 927-2678 to confirm your size.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving New Rochelle and nearby areas.