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
AfterFast, Reliable Chimney Cap & Crown Across Somerville
Chimney cap and crown work in Somerville typically runs $340-$1,200 depending on whether you’re sealing a sound crown or rebuilding a spalled one on a triple-decker stack, and most jobs are completed in a single visit with our crew already working in the area. We’ve been dispatching to Somerville from our Boston office for decades, and we know the difference between a Winter Hill brick stack and a Spring Hill one - both in condition and in how the condos inside were carved up. Call (857) 597-5950; a live person answers, even at 11 p.m. on a Sunday.
Somerville’s housing stock isn’t like the suburbs. The city has one of the densest concentrations of Victorian-era triple-deckers in the country, and most of those brick chimneys were built with soft lime mortar before reinforced concrete crowns existed. Our Chimney Cap & Crown team has documented hundreds of these stacks on camera, and we’ve learned that the same crown can look fine from the street and be shedding chunks into three separate flues below. That’s why we don’t quote by sight from the ground.
Why Hearthstone Chimney Co. Is Somerville’s Preferred Chimney Cap & Crown Company
We’ve been answering the phone with a live person for over 42 years, and that hasn’t changed. Somerville homeowners call us because we’ve been around long enough that their neighbors remember the job we did, and they know we’ll still be here if something needs adjusting. Our 90-Day Done Right Promise is in writing with no arguing - if it’s not right, we come back. No paperwork chase, no “let us check with the office.”
Our Boston-coordinated crews serve Somerville locally, which means we’re not driving down from New Hampshire or across from Worcester. That matters when you’re trying to get a crown sealed before the first hard freeze, or when a storm has lifted a cap and you’ve got water tracking down a party-wall stack into two units at once. Most jobs are completed in a single visit, with no-hassle upfront pricing so the number on the estimate is the number on the invoice.
We document everything. Our Level-2 camera inspections end with photos you can see and a plain-English verdict. In Somerville’s condo-converted triple-deckers, that documentation has saved more than one new owner from buying a liner they didn’t need - or worse, from missing a cracked flue that was venting their neighbor’s furnace.
Our Chimney Cap & Crown Services in Somerville
Cap Installation
New cap installation in Somerville usually means a multi-flue cap on a triple-decker stack, not a single-flue unit from the hardware store. A single cap over the wrong opening leaves abandoned conversion flues open to weather and animals, and it does nothing for the flue that’s actually drawing. We measure the crown footprint, account for the irregular brick courses common in 1880s-1920s construction, and fit a cap with proper base clearance so it doesn’t trap moisture against the brick. Most installations run $340-$580 for standard stainless, with custom copper or larger multi-flue bases running higher.
Cap Replacement
Cap replacement in Somerville often reveals the real problem: the crown beneath it has spalled, or the fasteners were driven into crumbly mortar that won’t hold anything anymore. We see this especially on roofs facing McGrath Highway or Broadway, where decades of road salt spray has accelerated corrosion. We don’t just swap the cap. We inspect the crown, the brick courses below, and the flue termination with our camera. If the crown needs work, we tell you before we quote the replacement. Cap replacement alone typically runs $280-$520; if crown repair is needed, we price both together so you’re not paying for a return trip.
Crown Repair
Crown repair is where Somerville’s freeze-thaw cycle does its worst damage. The original unreinforced brick crowns on these triple-deckers weren’t built to survive 100+ winters of Boston-area temperature swings around 32°F. Spalling - the surface flaking off in sheets - is common, and cracks let water straight into the flue system. We rebuild crowns with proper slope and drip edges, using materials rated for the abuse this climate delivers. A partial rebuild runs $680-$940; full rebuilds on larger multi-flue stacks can reach $1,200-$1,800. We never recommend a rebuild when a coating will do, and we never coat over active spalling - that’s just trapping water against the brick.
Crown Coating
Crown coating is the right call when the crown is structurally sound but porous, with hairline cracking and minor surface erosion. In Somerville, we see this most often on crowns that were rebuilt 15-20 years ago with Portland cement rather than proper crown mix - hard but brittle, with fine cracks that haven’t started spalling yet. We use professional-grade flexible coatings that bridge those cracks and shed water without trapping vapor. Crown coating typically runs $340-$580, and it’s usually a same-day job. But we only coat after camera inspection confirms the crown isn’t actively failing underneath. A flat-coat patch over failing lime mortar just traps water - the crown keeps shedding into the flues below, and you’re back where you started in two seasons.
Multi-Flue Cap
Multi-flue caps are the standard for Somerville triple-deckers, and they’re not an upsell - they’re a necessity. One brick stack, three units, often with abandoned conversion flues mixed in. A multi-flue cap covers the entire crown footprint with proper base clearance, protecting all openings and preventing the cross-draft that can pull exhaust from one flue into another. We fabricate custom bases to fit the irregular crown dimensions common on pre-WWI construction, and we use stainless or copper from brands like Gelco and Olympia Chimney that are built to outlast the fasteners. Multi-flue caps run $520-$980 depending on size and material, with custom copper work at the higher end.
Custom Cap
Custom caps are sometimes the only option for Somerville’s oddball crown footprints - the 1890s stack that’s two feet out of square, or the row house with a party-wall termination that no standard base fits. We measure, fabricate, and install on-site, usually in one visit. Custom work starts around $780 and runs to $1,400+ for large multi-flue copper with integrated spark arrestors. Every custom cap gets the same 90-Day Done Right Promise as our standard work.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Somerville
We work exclusively with professional-grade materials - no builder-grade substitutes that fail in three seasons. For Somerville’s harsh freeze-thaw environment, we specify Gelco multi-flue caps with stainless bases that won’t corrode where road salt spray hits, and Olympia Chimney components rated for the temperature cycling these stacks endure. We stock common sizes locally, which means faster turnaround when a storm has torn a cap loose or a failed crown is letting water into your flue before the next freeze. HeatShield crown coating products go on only after we’ve confirmed the substrate is sound, not as a cover-up. Every material choice is documented in your photo report, so you know exactly what was used and why.
Common Chimney Cap & Crown Problems We See in Somerville Homes
- Spalled crowns shedding into shared flues. The soft lime mortar in Somerville’s pre-WWI brick stacks can’t handle decades of freeze-thaw. Crown surfaces flake off in chunks, and those chunks fall straight down into flues serving multiple units. We find this on nearly every uninspected triple-decker stack over 80 years old.
- Single-flue caps fitted over the wrong opening. In condo-converted triple-deckers, abandoned oil-to-gas conversion flues often sit open beside active ones. A cheap single-flue cap gets installed over whichever opening looks right, leaving the true dead flue drawing weather, animals, and carbon monoxide risk into a neighboring unit’s chase. We’ve found squirrels nesting in flues that were supposed to be sealed.
- Cracked crowns patched with flat-coat cement that traps water. The quick fix - a layer of Portland over a failing crown - hardens like a shell while the brick beneath keeps deteriorating. Water gets in, can’t get out, and accelerates the damage. We strip these failed patches and rebuild properly, or coat only when the substrate is actually sound.
- Poorly seated caps leaking into party-wall stacks. Shared-wall row houses and triple-deckers mean cap fasteners and flashing land on a stack that serves two or three households. A cap that isn’t tied correctly, or flashing that doesn’t integrate with the roofline, leaks into multiple units at once. The repair is invisible until the next storm, and by then you’ve got water damage in two kitchens.
Pricing for Chimney Cap & Crown in Somerville, MA
Here’s what cap and crown work costs in Somerville’s market, based on jobs we’ve completed in the past two years:
| Service | Typical Range in Somerville |
|---|---|
| Single-flue cap installation | $280-$520 |
| Multi-flue cap installation | $520-$980 |
| Cap replacement (standard) | $280-$520 |
| Crown coating (sound substrate) | $340-$580 |
| Crown repair / partial rebuild | $680-$940 |
| Full crown rebuild | $1,200-$1,800 |
| Custom cap (fabricated) | $780-$1,400+ |
What moves the price: crown size and accessibility, whether the stack is on a party wall requiring ladder work or roof penetration, material choice (stainless vs. copper), and whether we find concealed damage once the old cap is off. We don’t guess from the ground. Every quote follows a Level-2 camera inspection with photos you can see. Estimates are free, and the number we give is the number on the invoice. Call (857) 597-5950 to schedule.
In Somerville’s condo-converted triple-deckers, one brick stack often contains three flues for three separate households, and it’s common to find abandoned oil-to-gas conversion flues left unlined and uncapped inside that shared chase - so a cap-and-crown quote legitimately depends on which of those flues our camera shows is live, dead, or already serving someone else’s appliance. Anyone who quotes a cap replacement without looking down every flue is guessing, and guessing with your money.
We were called to a triple-decker off Highland Ave in Spring Hill where the middle-floor condo owner kept smelling gas odor at the top-floor furnace’s flue. Our tech ran a Level 2 inspection down the shared brick stack and found the original clay tile cracked and the crown spalled into loose chunks, with the top-floor unit’s furnace vented into a flue the middle floor had assumed was theirs. We documented the crack on camera, installed a stainless multi-flue cap with a custom base to fit the irregular 1800s crown footprint, and rebuilt and coated the crown so water stopped tracking down the mortar joints - no liner sold that day, just the evidence-backed fix.
We Also Serve Cities Near Somerville
Our crews work throughout the metro area, and we regularly handle cap and crown jobs in Somerville as well as Boston, Everett, Chelsea, and Revere. The same triple-decker stock and freeze-thaw exposure extends across these neighborhoods, and we bring the same camera documentation and upfront pricing to every job. If you’re in a surrounding city and found this page, the same standards apply - call and we’ll schedule from our Boston office.
Serving Somerville, MA - Our Local Coverage Area
We’re based in the Somerville area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Chimney Cap & Crown in Somerville
A multi-flue cap covers the entire crown and all flue openings at once, which is essential when your stack contains active flues, abandoned conversion flues, and sometimes a neighbor’s appliance - a configuration we find in most Somerville triple-deckers. A single cap over one opening leaves the others exposed to rain, animals, and cross-drafting between units. We size multi-flue caps to the irregular crown footprint common on 1880s-1920s construction, with proper base clearance so moisture doesn’t get trapped. Call (857) 597-5950 and we’ll inspect every flue before recommending a cap configuration.
You don’t - and neither do we until we run a camera. In condo-converted triple-deckers, it’s common to find that none of the three new owners knows which flue belongs to which unit, or that a middle-floor gas insert was vented into a flue already serving the top-floor furnace. Our Level-2 inspection traces each flue from appliance to termination, documents the route on camera, and gives you a plain-English map of your stack. We don’t cap or seal anything until every homeowner in the building knows which flue is which. Call (857) 597-5950 to schedule the inspection.
Yes - we distinguish between the two with a camera inspection and a physical probe of the crown surface. Coating is appropriate for sound crowns with hairline cracking and minor porosity; repair or rebuild is necessary when there’s active spalling, deep cracking, or loose material that a coating would only trap moisture against. In Somerville’s climate, we’ve seen too many flat-coat patches over failing lime mortar that just accelerated the damage. We’ll show you the photos and explain which category your crown falls into. Estimates are free - call (857) 597-5950.
Yes - gas and oil appliances produce acidic condensation that deteriorates flue liners and crowns, and in Somerville’s freeze-thaw climate, a small crown crack in October becomes a spalled surface by March. Annual inspection catches crown deterioration, cap displacement, and flue damage before they become multi-unit water intrusion or carbon monoxide hazards. The inspection includes photos you can see and a written verdict, with no pressure to book work that isn’t justified by what the camera shows. Call (857) 597-5950 to schedule before heating season.
Start with a Level-2 camera inspection of every flue in your stack, not just the one you think is yours. You need to know: which flue serves your unit, whether any flues are abandoned and uncapped, whether the crown and cap are intact, and whether your appliance is vented into a flue designed for it. In Somerville’s condo conversions, we’ve found gas inserts vented into unlined coal flues and active furnaces sharing a flue with a dead oil conversion - both serious hazards. We document everything on camera, explain what needs immediate attention and what can wait, and never recommend work without evidence you can see. Call (857) 597-5950 for a free estimate.
Written by Russell Haines, Owner at Hearthstone Chimney Co., serving Somerville and local communities for over 42 years.