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
AfterHeatShield Chimney Cap & Crown in Gaithersburg: What to Know First
We install, repair, and replace HeatShield chimney caps and crowns in Gaithersburg, and we do it as an independent HeatShield service provider, not as a manufacturer rep. Most cap or crown work in Montgomery County runs $285 to $1,200 depending on the flue count, crown condition, and whether HeatShield resurfacing is needed under a failing crown. Every job starts with a camera-scan inspection and a written price before any work begins.
This page is for homeowners in Gaithersburg who already have a HeatShield liner or HeatShield joint repair system and now need the top of the chimney addressed, whether that’s a rusted multi-flue cap, a spalling crown, or both. If your cap leaks or your crown is shedding concrete, call (240) 220-9395 and we’ll schedule the inspection.
How HeatShield Products Fail - and How We Fix Them
HeatShield is primarily a flue liner repair system, but in Gaithersburg homes the cap and crown sitting above that liner take the brunt of Maryland weather. Here’s what we actually see in the field, and what we do about it.
- HeatShield Eco-Ceramic Crown Finish breaking down under standing water. Gaithersburg gets 40+ inches of rain a year and plenty of freeze-thaw cycles. The Eco-Ceramic crown overcoat applied over a damaged crown can start flaking if the underlying crown wasn’t properly sloped, usually within 3 to 5 years. We’ll check the slope first, then recommend either a proper crown rebuild with correct pitch or a compatible crown coating from the Gelco line if the base is still sound.
- HeatShield Cerfractory joint seams exposed at the flue opening. When a HeatShield liner was installed to seal cracks in the flue, the top few inches near the crown are the first place we see heat and moisture stress. The seam can widen enough to let crown water seep behind the liner. We address this by resetting the cap with proper clearance and sealing the transition so water drains away rather than into the seam.
- Factory multi-flue caps rusting at the screen weld points. We see this most often on two- and three-flue Gaithersburg homes built in the 1980s and 1990s near the Rio Washingtonian Center corridor. The cap’s screen-to-frame welds rust first because that’s where cap condensation and flue gases meet galvanized steel. We replace with stainless aftermarket caps sized to the exact flue dimensions, not the nearest generic size.
- Crown spalling accelerated by an oversized cap. This is a HeatShield adjacent problem we find on homes where a previous company installed a cap too wide for the chimney chase, often thinking bigger meant better. An oversized cap directs more water onto the crown surface, and once the crown starts spalling under the top edge, water migrates inward. We’ll measure the outside diameter against the chase top and right-size the cap before any crown work is quoted.
- Aluminum chase covers replacing steel ones and corroding at the mounting bolts. On prefab HeatShield installations, we occasionally find a corroded aluminum chase cover that’s pulling away at the corners, letting water run into the chase cavity. The fix is either a custom stainless chase cover or a properly sealed replacement with a drip edge, and we’ll document it all with photos before and after.
Our HeatShield Chimney Cap & Crown Process
- 1
Camera-scan inspection first. We run the camera down the flue before anyone touches the cap or crown. That tells us if the HeatShield liner is still doing its job below, because replacing a cap on a failing liner doesn’t help anyone. This is Clause 4 of the Haven Standard: a documented photo record on every visit.
- 2
Written scope and price. You get a line itemed price for the cap, the crown work, and any HeatShield resurfacing we recommend, along with the photos from the camera run. Nothing gets approved verbally. If you have another company’s written estimate, bring it: we offer a Free Second Opinion on any written estimate.
- 3
Parts decision: OEM or aftermarket. For caps, we prefer stainless aftermarket when the HeatShield crown and liner don’t need an exact brand match. For crown coating and repair material, we stay with either HeatShield’s compatible products or Gelco’s crown system so the warranty chain stays intact.
- 4
The repair or replacement. Cap replacement usually runs 60 to 90 minutes. Crown rebuilds and coatings can take half a day, depending on cure times. We’ll tell you the day’s scope before we start and we arrive with the parts on the truck based on photos and measurements taken during inspection.
- 5
Documentation and guarantee. You get a photo record of the finished work and a written warranty. Every job is backed by the 365-Day Done Right Promise: if it’s not done right, we make it right.
BeforeAfterWhat HeatShield Chimney Cap & Crown Costs in Gaithersburg
Here’s the honest range we quote in Gaithersburg for the work described above.
- Single-flue stainless cap replacement: $285 to $460 installed
- Multi-flue cap replacement (custom sized): $480 to $780
- Crown sealing with Gelco or compatible coating: $390 to $620
- Full crown rebuild with proper slope and drip edge: $780 to $1,200
- HeatShield Eco-Ceramic crown finish repair: $350 to $550 when the base crown is still structurally sound
What moves the price: access from the roof, flue count, chase height, and whether we’re repairing a crown or rebuilding it from scratch. You’ll have a written price before we start, and the estimate is free. Call (240) 220-9395 to schedule.
Why Gaithersburg Homeowners Call Level Two Chimney Gaithersburg for HeatShield Work
Corrine Halstead and our crew have been servicing Gaithersburg chimneys for years, and we have pulled hundreds of cameras down HeatShield and HeatShield-related flues. That’s not a talking point; it’s how we know that a failing crown from the 1990s will often show up as a liner seam crack five feet down before it shows up in the living room as a stain. When we quote a cap and crown job, we quote the whole picture.
We’re not a HeatShield authorized dealer, and we don’t need to be. We source from the same materials network we have used for years, DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield. If a cap is the right fix, we say so. If the crown needs rebuild work before a new cap will matter, you’ll see it on camera and we’ll show you the photos. The camera doesn’t guess. Neither do we. Cost is always written before work starts, and the 365-Day Done Right Promise stands behind it.
FAQs
Yes, as an independent HeatShield service provider, we can perform cap, crown, and even liner-adjacent work without automatically voiding your HeatShield liner warranty. What actually matters is whether the work changes the liner’s contact with the flue or the crown. We document everything with photos so you have a record for any future claim. Call (240) 220-9395 and we’ll walk you through what your specific HeatShield system allows.
That depends on what the camera and the crown surface show. If the crown has hairline cracks but is still solid and properly sloped, a compatible crown coating costs $390 to $620 in Gaithersburg. If the crown is spalling, meaning chunks are coming off, coating won’t help. We’ll show you the photo evidence either way and write the recommendation you’d make if it were your house. Call (240) 220-9395 for a free inspection.
Most single-flue cap replacements are done same day, and we arrive with the parts measured and on the truck. Multi-flue or custom caps may take 3 to 5 business days if the chase dimensions require a made-to-order size. You’ll know the timeline in writing before we book.
When the base crown is still structurally sound, HeatShield’s Eco-Ceramic finish is a legitimate repair option that runs $350 to $550. When the crown is cracked down to the masonry and shifting, a rebuild is the only fix that lasts. We have no preference except the one that matches the condition, and we’ll quote both if both apply. Call (240) 220-9395 and we’ll put it in writing.
For caps, we carry a range of stainless single-flue and multi-flue sizes and custom-order the rest. For crown and liner materials, we source from HeatShield, Gelco, and DuraFlex through our supplier network, and we confirm lead times before quoting. You’ll know what’s in stock and what’s ordered before you authorize anything.
Contact Level Two Chimney Gaithersburg
If you have a HeatShield liner and a chimney cap or crown that’s due for attention, call (240) 220-9395 for a free estimate. We answer live around the clock, and we’ll schedule a camera-scan inspection with a written price before any work starts.
Written by Corrine Halstead, Owner, Level Two Chimney Gaithersburg at Level Two Chimney Gaithersburg, serving Gaithersburg and nearby areas.