What the coast and the cold do to a Quincy chimney
Quincy chimneys live in a harder environment than most people realize. The town sits right on the water, and the damp, salt-bearing air that drifts in off the bay is patient and corrosive. It works on the mortar joints, the metal flashing, and the steel components of a chimney year after year, drawing moisture into the brick and accelerating the rust and decay that dry inland air would take much longer to cause. A chimney that would last decades in a drier climate can show its age noticeably faster within sight of the coast, which is why we pay such close attention to the masonry and the metal on every chimney we inspect here.
Then comes the New England winter, which is brutal on brick in a very specific way. Masonry is porous and soaks up water, and when that trapped water freezes it expands, prying the brick and mortar apart from the inside. Our winters do not freeze once and stay frozen. They cycle above and below the freezing line again and again, sometimes within a single day, and each one of those cycles widens the cracks a little more. A chimney crown that was sound in October can be flaking and fissured by April. This relentless freeze and thaw is the single biggest reason South Shore chimneys spall, crack, and leak, and it is exactly what a fall inspection is meant to catch before the worst of the cold arrives.