A chimney is only as sound as the masonry holding it together, and in Somerville that masonry has weathered a century of hard New England winters. Mortar joints wash out, brick faces spall and crumble, and crowns crack, and once the masonry starts to fail, water gets in and the freeze-thaw cycle accelerates the damage from there. Somerville Chimney Sweep handles the brick and mortar side of chimney work, from tuckpointing eroded joints to replacing spalled brick to rebuilding a failed crown, matching new materials to your existing chimney and waterproofing where it makes sense so the repair lasts.
- Tuckpointing and repointing of eroded joints
- Spalled and cracked brick replaced
- Crown rebuilt and sealed against water
- Color-matched mortar and brick
- Waterproofing applied where the masonry warrants it
- Full or partial rebuilds when the stack has deteriorated
How freeze-thaw takes a Somerville chimney apart
Masonry fails in this city largely because of one relentless process, the freeze-thaw cycle. Brick and mortar are porous, so they absorb water from rain and snow. When that water freezes it expands, prying at the mortar joints and pushing the face off the brick, and when it thaws it soaks back in to do it again with the next cold snap. Over a Somerville winter that cycle repeats again and again, and over many winters it washes the mortar out of the joints, spalls the faces off the brick, and works the whole stack loose. The damage is slow and easy to ignore until a chunk of mortar lands in the yard or a brick comes loose at the top.
The upper part of the chimney takes the worst of it, because that is the most exposed masonry on the entire house. It catches the wind-driven rain, it freezes hardest, and it is furthest from any warmth. That is why so many Somerville chimneys show their first real masonry trouble at the crown and the top few courses of brick, and why a problem up there is easy to miss from the ground. Once the joints are open and the brick is spalling, water has a direct path into the chimney, which feeds the leaks, the liner damage, and the interior staining that bring people to call in the first place.
Repointing, brick replacement, and crown rebuilding
Most masonry repair on a Somerville chimney falls into three jobs, and which one you need depends on how far the deterioration has gone. Tuckpointing, also called repointing, is the repair for eroded mortar joints. We grind out the failed mortar and pack in fresh, color-matched mortar, restoring the joints that hold the brick together and seal water out. Done before the brick itself is damaged, it is the most cost-effective masonry repair there is. When brick faces have already spalled or cracked, we replace the damaged brick, matching it to the existing chimney as closely as the materials allow so the repair blends in rather than standing out.
The crown, the sloped cap of concrete or mortar at the top of the chimney, is its own repair and one of the most important. A cracked or crumbling crown is one of the leading ways water gets into a Somerville chimney, because it sits flat to the sky and takes the full weight of the weather. We seal a crown that is cracking and rebuild one that has failed, sloping it to shed water away from the flue the way it was meant to. Where the deterioration has gone far enough, we rebuild the top courses of the stack, or in serious cases more of it, but we always scope the smallest repair that genuinely fixes the problem rather than defaulting to a teardown.
Matching the work and keeping the water out
Good masonry repair should look like it was always part of the chimney, and that takes more than packing in mortar. We match the new mortar to the color and the joint profile of the existing work and the new brick to the old as closely as the materials allow, so a repointed section or a replaced brick blends into the chimney rather than announcing itself. On a visible chimney on a Somerville Victorian or triple-decker, that match matters, and it is the kind of detail that separates careful masonry from a quick patch.
Because water is what drives almost all of this damage, keeping it out is part of doing the repair right. Where the masonry warrants it, we apply a breathable waterproofing that lets the brick release moisture while keeping driving rain from soaking in, slowing the freeze-thaw cycle that caused the trouble in the first place. We pair the repair with the right cap and crown work so the whole top of the chimney sheds water as a system. The goal is masonry that is sound, matched, and protected, so the chimney stands up to the next New England winter rather than starting the same slow decline over again.
Where this work sits in the bigger picture
A chimney is a system, so masonry & tuckpointing rarely stands alone, it connects to fireplace sweep, pre-season chimney inspection, crown repair, a new chimney cap, stainless liner installation, and our crew handles all of it under one roof. We bring the same service to Masonry & Tuckpointing in Cambridge, Medford masonry & tuckpointing, Everett masonry & tuckpointing, Malden masonry & tuckpointing and everywhere else across the Somerville area.
If you searched for a local chimney crew near you, you have reached a local crew, call 617-203-6382 any time. For background, read Caring for the Chimney on a Somerville, MA Victorian on our blog, or head back to our Somerville home page to see everything we do.