07/17/2026
Here is something most people never think about: your chimney is expanding and contracting every single day. Central Texas swings through wide temperature ranges, hot afternoons and cooler nights, blazing summers and milder spells, and masonry grows when it heats and shrinks when it cools. That is heat cycling, and it is our version of the freeze-thaw stress colder regions deal with. Over months and years, that constant daily movement opens hairline cracks, widens existing ones, and loosens mortar joints. And a chimney, fully exposed on all sides above the roofline, takes the full force of it. This is why cracks appear even without a hard freeze. More on how it works here.
Central Texas chimneys crack for reasons specific to the region. How heat cycling, UV, and Hill Country soil damage masonry, and how to protect your chimney.