Cracked chimney crown? We seal, resurface, or fully replace damaged crowns before water destroys your chimney structure. Crown resurfacing from $400. Free inspection and estimate.
The chimney crown is the concrete slab on top of your masonry chimney. It sheds water away from the flue and protects the brick and mortar below. When it cracks — and in Chicago, they all crack eventually — water enters the chimney structure and accelerates deterioration through freeze-thaw cycles. A small crack this year becomes crumbling mortar joints next year and a full chimney rebuild the year after.
| Service | What It Involves | Cost |
|---|---|---|
| Crown resurfacing | Flexible sealant applied over existing crown (hairline cracks, surface wear) | $400–$600 |
| Crown replacement | Remove old crown, pour new with overhang, drip edge, reinforcement | $800–$1,500 |
| Crown + tuckpointing combo | Crown work plus mortar joint repair on surrounding courses | $1,200–$2,500 |
Resurfacing is right when: the crown has hairline cracks or surface erosion, the underlying structure is still solid, and the crown has proper shape (slight slope, overhang). We apply ChimneySaver CrownCoat — a flexible, waterproof sealant with a 15-year warranty that bridges cracks up to 1/4 inch and moves with the chimney through temperature changes.
Replacement is right when: the crown is missing large sections, has cracks wider than 1/4 inch, was built flat with no overhang (extremely common in Chicago), or is made of straight mortar instead of a proper Portland cement mix. We remove the old crown completely and pour a new one with steel mesh reinforcement, a proper Portland cement mix, a minimum 2-inch overhang on all sides, and a drip edge that sheds water away from the brick — the way it should have been built originally.
A cracked crown that costs $400-$600 to seal today will cost you $3,000-$5,000+ in chimney rebuilding within 3-5 years if left untreated. Here is the progression: hairline cracks allow water in, water freezes and expands in Chicago winters (50+ freeze-thaw cycles per season), the cracks widen and deepen, water reaches the mortar joints below, mortar erodes and bricks begin to spall (the face pops off), and eventually the chimney loses structural integrity and requires a partial or full rebuild above the roofline. Catching it at the crown stage is the cheapest possible intervention.
The majority of crown problems we see are on Chicago bungalows (1920s-1940s) and brick two-flats throughout neighborhoods like Portage Park, Jefferson Park, Garfield Ridge, Bridgeport, and the bungalow belt stretching from Cragin to Chicago Lawn. These chimneys were built with flat, thin mortar crowns — often just a layer of leftover mortar spread across the top. No overhang, no drip edge, no proper cement mix. These flat crowns pool water instead of shedding it, and Chicago's freeze-thaw cycles destroy them faster than properly built crowns. If your home is a pre-1950 Chicago bungalow or two-flat, there is a high probability your crown needs attention.
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