What the lake-shore climate does to a Lorain chimney
Lorain sits right on Lake Erie, and that location shapes everything about how the local chimneys wear. The lake feeds heavy, wet winters and the kind of lake-effect snow that piles onto a crown and sits there for days. It also drives the humidity that makes water the single biggest enemy of a masonry chimney here. Brick and mortar are porous, they drink up moisture, and when that soaked masonry goes through the relentless freeze-thaw cycle of a shoreline winter, the water inside it expands as it freezes and pries the material apart from within. One winter is rarely enough to matter. Ten of them turns sound brick into spalled, crumbling faces and mortar joints you can pick out with a finger.
The second half of the local story is heat and use. Because the heating season here is long and the wind off the water makes a fire genuinely welcome, Lorain fireplaces burn a lot of wood, and wood smoke is what coats the flue in creosote. The cooler and slower a fire burns, the more creosote it lays down, and a flue carrying a load of that tarry, flammable residue is the leading cause of chimney fires. So the two forces work from opposite directions. Water attacks the chimney from the outside in, creosote builds up on the inside, and a chimney that gets neither swept nor inspected through several hard Lorain winters is quietly stacking up both problems at once.