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.
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AfterFast, Reliable Chimney Cap & Crown Across Somerville
Chimney cap and crown repair in Somerville typically costs $280-$890 depending on whether you need a single-flue cap replacement or full crown rebuild on a triple-decker stack, and most jobs are completed in one visit. Hearthstone Chimney Co. has been serving Eastern Massachusetts for over 42 years, with dispatch coordinated from our Boston office and crews working Somerville neighborhoods daily. Call (781) 905-8338 for a free estimate - estimates include a Level 2 camera inspection with photos you can see.
We know Somerville’s chimneys. The triple-deckers in Winter Hill, the century-old brick stacks along Broadway in Magoun Square, the converted flues in East Somerville - our technicians have capped, crowned, and sealed them all. These aren’t suburban single-flue systems. They’re multi-tenant masonry stacks built between 1880 and 1930, originally sized for coal, now venting gas appliances and wood inserts into flues that were never designed for them. That mismatch is where most cap and crown problems start.
Why Hearthstone Chimney Co. Is Somerville’s Preferred Chimney Cap & Crown Company
We’ve worked Somerville long enough to know the difference between a Winter Hill triple-decker built in 1905 and a Davis Square conversion from the 1920s. That matters when you’re sizing a multi-flue cap or diagnosing why one tenant’s exhaust is showing up in another unit’s kitchen. Our Chimney Cap & Crown team doesn’t guess - we run a camera, show you the footage, and explain what we’re seeing in plain English.
Our reputation here is built on documentation, not promises. Every Level 2 inspection ends with dated photos and a written verdict. The 90-Day Done Right Promise backs every job in writing - if it’s not right, we make it right, no paperwork and no arguing. Calls are answered by a live person 24 hours a day, 7 days a week, and our background-checked, uniformed technicians carry professional-grade materials from Gelco, Olympia Chimney, and Famco so most Somerville jobs finish in a single visit.
No-hassle upfront pricing means the number on your estimate is the number on your invoice. We’ve been at this since 1984, and we plan to be here in thirty more years. That changes how you treat every customer.
Our Chimney Cap & Crown Services in Somerville
Multi-Flue Cap Installation
Most Somerville triple-deckers need multi-flue caps, not standard single-flue models. A single chimney stack in Winter Hill or Magoun Square often contains two or three separate masonry flues serving individual units. We size and install multi-flue caps from Olympia Chimney and Famco that cover the entire stack, protecting all flues while maintaining proper draft clearance. A cap sized for only one opening leaves neighboring tenants exposed to rain, animal entry, and accelerated spalling - a scenario we see too often in landlord-owned buildings where one unit got serviced and the others didn’t.
Custom Cap Fabrication
Standard caps don’t always fit Somerville’s irregular stack dimensions. Century-old brickwork settles. Flue spacing varies. We’ve fabricated custom caps for Highland Avenue triple-deckers, Broadway conversions, and the oddball single-family Victorians near Powder House Park. Gelco and Copperfield components form the base, cut and fitted to your stack’s actual measurements. Custom work runs $450-$780 in Somerville, including installation and a five-year workmanship guarantee.
Crown Repair
The mortar crown is the horizontal slab sealing the top of your chimney stack. On Somerville triple-deckers, one flat crown spans all flues - and cracks at the seams first. Freeze-thaw cycles from November through March drive water into those cracks, eroding the mortar web between flues. That’s where carbon monoxide crossover happens. We remove deteriorated crown material, reform the slope for proper drainage, and pour new crown mortar rated for Eastern Massachusetts temperature swings. Crown repair in Somerville typically runs $380-$650.
Crown Coating
For crowns with minor cracking but sound structural integrity, we apply a flexible crown coating from HeatShield that bridges hairline cracks and repels water. This isn’t a substitute for rebuilding a failed crown, but it’s an effective preventive measure on Somerville stacks showing early deterioration. Coating runs $280-$420 and adds 5-7 years of protection when applied before freeze-thaw damage progresses.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Somerville
We stock professional-grade caps, crowns, and hardware from Gelco, Olympia Chimney, and Famco - no builder-grade substitutes that fail in New England weather. Our Boston-area warehouse carries common multi-flue and custom cap sizes, so most Somerville jobs don’t wait on parts. When we need specialty fabrication, Copperfield components arrive within 48 hours. Every brand we use is specified for freeze-thaw durability and proper draft performance on masonry chimney systems. That’s the standard for a city where January nights hit single digits and March thaws dump meltwater into every crack.
Common Chimney Cap & Crown Problems We See in Somerville Homes
- Carbon monoxide crossover between triple-decker units. When the mortar web separating two flues in a shared stack deteriorates, exhaust from one apartment’s appliance can migrate into an adjacent flue and backdraft into a neighbor’s unit. We find this regularly in Somerville’s rental housing. A proper multi-flue cap and sound crown are your first line of defense.
- Freeze-thaw spalling on century-old mortar. Somerville’s brick chimney stacks endure 15-20 freeze-thaw cycles each winter. Water enters crown cracks, expands when it freezes, and pops off mortar faces by spring. Annual inspection catches this before the crown fails completely.
- Single-flue caps installed on multi-flue stacks. A landlord repairs one unit, caps one flue, and leaves the other exposed. Rain enters the uncapped flue, accelerates deterioration of the shared crown, and eventually damages the capped flue too. We see this pattern repeatedly in absentee-owned triple-deckers.
- Undersized flues venting modern appliances. Original clay-tile flues built for coal furnaces run too cold for efficient gas appliance venting. The flue never develops adequate draft, condensation accelerates liner deterioration, and the crown above takes excess moisture damage. Proper cap sizing and crown integrity become even more critical on these marginal systems.
Pricing for Chimney Cap & Crown in Somerville, MA
| Service | Typical Range in Somerville |
|---|---|
| Single-flue cap replacement | $280-$420 |
| Multi-flue cap installation | $450-$680 |
| Custom cap (fabricated to fit) | $450-$780 |
| Crown coating (preventive) | $280-$420 |
| Crown repair (partial rebuild) | $380-$650 |
| Full crown rebuild | $680-$890 |
What moves the price? Stack height and access. Number of flues. Extent of mortar deterioration. Whether we need scaffolding or can work from the roofline. We price every job upfront after camera inspection - no surprises on the bill. Every estimate includes the Level 2 inspection with photos; if your crown and cap are sound, we’ll tell you so. Standing offers include $50 off any repair over $250, free second opinions on written estimates, and a permanent 5% senior and veteran discount.
We Also Serve Cities Near Somerville
Our crews work daily throughout the metro area. If you’re in Somerville or nearby Medford, Belmont, Brookline, or Winchester, the same technician standards and 90-Day Done Right Promise apply. Dispatch is coordinated from our Boston office, and we schedule to minimize travel time from one local job to the next.
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
Yes. Two flues in one stack require a multi-flue cap sized to cover both openings with proper clearance for draft. A single-flue cap leaves the second flue exposed to rain, animals, and accelerated deterioration. We measure your stack’s exact dimensions and install caps from Olympia Chimney or Famco built for multi-flue configurations. Call (781) 905-8338 for an exact quote - estimates are free.
Yes. When the mortar crown cracks and the mortar web between flues deteriorates, combustion gases from one unit’s appliance can leak into an adjacent flue and backdraft into a neighboring tenant’s living space. We documented exactly this on a Highland Avenue triple-decker in Winter Hill - camera footage showed the mortar separation clear through. A rebuilt crown and custom multi-flue cap stopped the crossover. Nothing is recommended without camera evidence you can see for yourself.
A cap blocks rain, yes. But on Somerville’s unlined or clay-tile flues, it also prevents animal entry (squirrels and starlings love these warm stacks), reduces downdraft that blows smoke back into apartments, and contains sparks from wood or pellet stoves. The secondary benefit is protecting the mortar crown beneath from direct precipitation and freeze-thaw damage. Given Somerville’s housing stock, a proper cap pays for itself in prevented crown repairs.
Absolutely. Our Level 2 camera inspection produces dated photos of your flue interior, crown condition, and any mortar separation between flues. We explain what we’re seeing in plain English and email you the footage. If the crown is sound, we’ll say so. If it’s failing, you’ll see exactly where and why. No homeowner should buy chimney work they can’t verify with their own eyes.
We apply HeatShield crown coating on crowns with minor cracking but sound structural integrity. It bridges hairline cracks and repels water, adding 5-7 years of protection. It’s not a substitute for rebuilding a failed crown - we don’t sell coatings on crowns that need structural repair. The camera inspection determines which approach is appropriate for your stack. Call (781) 905-8338 to schedule - estimates are free.
Written by Russell Haines, Owner at Hearthstone Chimney Co., serving Somerville and Eastern Massachusetts since 1984.