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 Chimney Cap Installation: The Hicksville Owner’s Guide
A properly fitted DuraFlex chimney cap installation in Hicksville typically runs between $380 and $720 installed, depending on flue diameter and whether your crown needs remediation before mounting. We stock the full DuraFlex cap line for 6-inch through 12-inch round flues and most oval configurations, and we can usually have a technician out within a day or two during sweeping season. Most Hicksville homeowners realize their cap has failed when they spot rust streaks on the chimney breast, hear water dripping in the flue during a nor’easter, or find debris - sometimes a squirrel’s nest, sometimes just years of leaf litter - sitting on top of a warped or missing lid.
Which DuraFlex Models This Applies To
DuraFlex organizes its chimney caps by flue diameter and series: the standard 304-alloy caps for 6″, 7″, 8″, 10″, and 12″ round flues, plus the oval variants for factory-built fireplace systems common in 1980s Hicksville split-levels. The critical detail is matching your inner flue diameter, not the outer terracotta or metal chase dimensions. We’ve seen homeowners in the Levittown-adjacent sections of Hicksville order a cap by exterior crown measurement and end up with a lid that rattles in the wind or, worse, slips down the flue.
Check the stamped collar on your DuraFlex liner if it’s exposed, or measure the flue opening with a tape measure across the inside edge. The cap model number will start with “DF” followed by the diameter. We also carry HeatShield and Gelco equivalents where the original DuraFlex spec has been discontinued, and we’ll tell you straight if an aftermarket cap fits your warranty situation or if OEM is the smarter call. Hearthstone Chimney Co. is an independent service provider - we don’t work for DuraFlex - so our recommendation is based on what lasts on your particular chimney, not what moves inventory.
Signs Your DuraFlex Chimney Cap Installation Is Failing
- Rust staining on the chimney face or hearth. DuraFlex caps use 304 stainless, but the mesh screen and the seam where the lid meets the collar are the first to corrode in Hicksville’s salt-air environment, especially within a mile of the LIRR corridor. Once the screen perforates, water tracks down the flue and exits wherever it finds a gap.
- Visible mesh sag or lid detachment. The lid is held by stainless tabs that fatigue after 15-20 years of thermal cycling. A lid that sits crooked or lifts in wind has already failed structurally, even if it hasn’t blown off yet.
- Water in the firebox after heavy rain. This means the cap’s overhang is compromised, or the flue gas velocity in a low-efficiency insert is too weak to prevent down-drafting past a damaged lid seal. We’ve traced this exact symptom to cracked DuraFlex caps in the older colonials near Broadway Mall more than a dozen times.
- Animal intrusion - birds, squirrels, or raccoons. A cap with intact 5/8-inch mesh keeps them out. When the mesh rusts through or the mounting collar loosens, you’ve built a wildlife hotel. The nests are flammable, and the smell when they die is unforgettable.
- Spalling brick or deteriorated mortar at the chimney top. This is secondary damage from a cap that failed years ago. Water freezes in the crown, expands, and begins destroying the masonry beneath. By the time you see this, the cap replacement is only the first item on the list.
Replacement Cost & What’s Included
For Hicksville homes, DuraFlex chimney cap installation breaks down as follows:
- Standard 6″-8″ round cap, installed on sound crown: $380-$490
- 10″-12″ round or oval cap, installed on sound crown: $520-$620
- Crown remediation or sealant required before mounting: add $180-$340
- Flue extension or custom collar fabrication for non-standard chase: add $150-$280
The price includes the cap, stainless hardware, a Level-2 camera inspection of the flue after installation, and photos of the mounted cap from two angles. We don’t quote by phone without seeing the chimney, because we’ve learned the hard way that “just a cap” often reveals a cracked crown or liner gap once we’re on the roof. The number on your estimate is the number on your invoice. Every cap installation carries our 90-Day Done Right Promise - in writing, no arguing - and the DuraFlex manufacturer’s own defect coverage applies for ten years on 304-alloy products.
DIY or Call Us?
An owner can safely check whether the cap is present, whether the lid sits level, and whether the mesh has obvious holes from the ground with binoculars. Do not climb the roof. Hicksville’s split-levels and two-story colonials often have pitches that look manageable from the driveway and aren’t, especially after rain when moss builds up on the north-facing slope. The cap itself is not high-tension, but the fall risk is real, and a dropped tool down a flue can damage a liner that was fine five minutes ago.
Where DIY goes wrong is in the fit. DuraFlex caps seal by friction and a stainless draw-band that requires even pressure all around. Uneven tightening warps the collar, creates a gap that leaks, and voids the warranty. We’ve re-installed enough homeowner attempts to know it costs more to fix the second time. If you’re unsure, call (516) 259-3797 and we’ll give you a straight answer about whether your situation is routine or needs eyes on it.
FAQs
A 304-stainless DuraFlex cap typically lasts 20-25 years in Nassau County’s climate, though homes within a few miles of the salt marsh or the LIRR corridor may see screen corrosion closer to 15 years. The lid itself usually outlasts the mesh. Call (516) 259-3797 if you’re unsure of your cap’s age - we can date it by the stamping and condition during a free estimate.
Screen patching and lid-straightening are possible but rarely worth the labor cost compared to a new cap with full warranty coverage. We don’t recommend repairs on caps older than 12 years because the adjacent corrosion isn’t visible until disassembly. Call (516) 259-3797 and we’ll show you the camera footage so you can decide with the facts in front of you.
Most DuraFlex cap replacements take 45 to 90 minutes on site, assuming the crown is sound and the flue collar is accessible. If we find crown damage or liner gaps during the pre-install inspection, we’ll stop, show you the photos, and quote the additional work before proceeding. Most jobs are completed in a single visit.
We carry the full DuraFlex round and oval line on our trucks, along with HeatShield and Gelco equivalents for discontinued specs. If your configuration is unusual - a custom chase pan, an extremely tall flue extension - we may need a day to fabricate. We’ll tell you when you call.
The chimney doesn’t care what you hoped it was - it shows you what it is. After 42 years in this trade, we’ve learned to look at what’s actually up there, document it with photos you can see, and give you a plain-English verdict on what needs doing now versus what can wait. No surprises on the bill. Done right, and we stand behind it.
If your DuraFlex cap is showing its age, call (516) 259-3797. A live person answers 24 hours a day, 7 days a week - not a voicemail, not a callback queue. We’ll schedule a free estimate, show you exactly what we find, and price the work before we start. Senior and veteran discounts apply, and we honor our $50 off any repair over $250 for first-time customers.
Written by Russell Haines, Owner & Master Sweep, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Hicksville and nearby areas.