What a Butler County year does to a Hamilton stack
A chimney in Hamilton absorbs punishment that has nothing to do with how many fires you light. The masonry stands fully exposed above the roofline and takes the entire swing of an Ohio Valley calendar, the muggy heat of a Butler County July, the long soaking rains that ride up the Great Miami River corridor, and then the relentless freeze-and-thaw of a southwest Ohio winter. Brick and mortar are thirsty materials, and they pull water in during every wet stretch. When that trapped water turns to ice it swells, and the swelling levers the masonry apart from the inside out. Every hard freeze widens what the last one started, and the crown at the very peak, the flattest and most weather-beaten surface on the whole stack, is almost always the first piece to surrender.
The heating season piles on a second kind of damage that works the opposite way. Every wood fire lays down creosote along the inside of the flue, a sticky, flammable film that thickens in layers and pinches the channel the smoke has to climb. A flue even partly coated in hardened creosote is two hazards at once, a fire waiting on a hot enough night and a draft slowly being strangled. So the two forces grind on the chimney from opposite ends at the same time, water and ice prying the structure apart from the top down while creosote packs the flue from the firebox up. That is precisely why a Hamilton chimney earns a look on a schedule, not only on the day something has plainly gone wrong.