A failing crown is often the real reason a Boston chimney leaks, even when the flashing and brick look perfectly fine from below. We coat a repairable crown with a flexible sealant that moves with the masonry, or rebuild a failed one so it lasts decades, not seasons. Older Boston homes frequently have crowns that were patched with the wrong material before, and that failed patch is part of what we fix. You get photos of the cracked crown and the finished repair, since you cannot see the top of your own chimney. Reach 508-305-7969 for a crown repair built to survive MA winters.
- Flexible crown coating
- Full crown rebuilds with overhang
- Freeze-thaw-rated materials
- Photos from the roof
- Honest seal-or-rebuild call
What Happens If You Wait
The crown is the sloped concrete (or sometimes mortar) cap covering the top of the chimney, with the flue tiles projecting through it. Its entire job is to shed water away from the masonry below. A properly built crown has an overhang with a drip edge so water falls clear of the brick; a poorly built one — flat, thin, or flush with the brick face — channels water straight down into the stack. Many of the crowns we see on older Boston chimneys were never built to shed water properly in the first place.
Masonry and water do not mix well, and a Boston chimney lives outdoors taking weather from every side. Rain driven against the brick, snow melting and refreezing on the crown, and the constant temperature swings of a MA year all conspire to open the chimney up to moisture. The chimneys that last are the ones whose owners address the small problems before the freeze-thaw cycle compounds them.
Our Approach, Step by Step
Deciding between sealing and rebuilding a crown comes down to how far gone it is. Hairline cracks on an otherwise sound crown can be sealed with a flexible, paintable membrane that bridges the cracks and moves with the masonry as it expands and contracts. A crown that is heavily cracked, crumbling, or missing chunks needs to come off and be rebuilt — properly formed this time, with the overhang and drip edge it should have had. We tell you honestly which one yours needs.
A rebuilt crown is poured, not patched. We form it with a proper slope and an overhang that extends past the brick face, and we use materials rated for MA freeze-thaw rather than ordinary mortar that will crack again in a season or two. A correctly rebuilt crown is the kind of repair you do once and forget about for decades, which is exactly the standard we build to.
Boston Housing Stock and Your Chimney
Boston is an old-housing-stock town, and area around it is much the same. The chimneys reflect that — plenty of them have served their homes for fifty years or more, through countless MA winters. We treat that age with respect, repointing and repairing in ways that match the original work rather than tearing into a sound old stack with a one-size-fits-all approach.
Keeping the Fire Where It Belongs
Beyond the masonry, the real reason chimney care matters is safety. A flue lined with creosote is a fire waiting for a hot enough night; a cracked liner lets heat and combustion gases reach the wood framing around the chimney; a blocked flue pushes carbon monoxide back into the living space. None of these are visible from the couch, and all of them are exactly what a proper inspection and the right service are meant to prevent.
Most Boston homeowners only think about their chimney when something seems wrong, which makes them easy targets for the scare-tactic end of this trade. Chimney Shield Boston refuses to work that way. We grade what we find honestly, we explain the difference between a problem that needs fixing now and one that can wait a season, and we put it all in writing. An honest assessment is worth more than a fast sale.
One call, every chimney job
A chimney is a system, so chimney crown repair rarely stands alone — it connects to flue cleaning, camera flue scan, brick repair, spark arrestor cap, stainless flue liner, and our crew handles all of it under one roof. We bring the same service to Chimney Crown Repair in Cambridge, Chimney Crown Repair in Somerville, Brookline chimney crown repair, Newton chimney crown repair and everywhere else across the area.
If you searched for a local chimney crew near you, you have reached a local crew — call 508-305-7969 any time. For background, read Why Your Boston Fireplace Smokes Back Into the Room on our blog, or head back to our Boston home page to see everything we do.
