The chimney crown is the concrete slab on top of the chimney that sheds water away from the flue. In Minnesota it cracks from freeze-thaw cycles, letting water in. Crown repair or rebuild is a common, fixable job.
What it does
The crown caps the top of the masonry and slopes to direct rain and snow away from the flue and brickwork. A sound crown is your chimney's first line of defense against water.
Why it cracks
Water sits on the crown, freezes, and expands, cracking the concrete. Once cracked, more water gets in and the cycle accelerates, threatening the brick and liner below.
How it is repaired
Small cracks can be sealed with a crown coating; a badly damaged crown is rebuilt. Pairing crown repair with a cap and waterproofing keeps water out long-term.
Frequently Asked Questions
Is a cracked crown serious?
Yes, it lets water into the chimney and drives further damage.
Repair or rebuild?
Minor cracks can be coated; major damage needs a rebuild.
How long does a crown last after repair?
Years, especially with a cap and waterproofing.
Need a chimney sweep, inspection, or repair?
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