A chimney chase cover in Lexington, KY only applies if your chimney is factory-built rather than masonry — and knowing which one you have before calling a repair company saves everyone a wasted trip, since a chase cover and a masonry crown solve the same water problem on two completely different chimney types.
How Do I Tell If I Have a Masonry Chimney or a Factory-Built One?
A masonry chimney is built brick-by-brick from the foundation up and has a solid concrete crown on top; a factory-built chimney is a metal flue pipe boxed in by a framed, siding-covered enclosure called a chase, topped with a thin metal chase cover instead of poured concrete.
Look at what’s on top: a flat or slightly sloped slab of concrete or mortar means masonry, and that’s what a chimney crown repair or rebuild addresses. A flat sheet-metal pan, sometimes with a small pitch and a single flue pipe or two sticking through it, means factory-built, and that pan is the chase cover — a component the Chimney Safety Institute of America covers separately from masonry crown and carpentry work because the failure points and materials are different. We’re a masonry contractor, so the crown side is our work; a cracking or rusted chase cover on a factory-built chimney is usually handled by a chimney sweep or the original installer, and we’ll tell you plainly if that’s what you’re looking at instead of quoting masonry work you don’t need.
Why Does a Chase Cover Fail Faster Than a Masonry Crown?
A galvanized steel chase cover typically lasts five to ten years before rust perforates it, while a properly built and sealed masonry crown can go decades before it needs attention.
The gap comes down to material and geometry. Thin sheet metal sitting in standing water and freeze-thaw cycles corrodes from the inside out, usually starting at seams and screw penetrations; stainless steel or copper chase covers cost more up front but can run 40–50 years for the same reason a masonry crown does — better material resisting the same weather. A masonry crown’s failure mode is different: hairline cracks from shrinkage or a flat pour with no wash (slope) let water sit and freeze, which is the same freeze-thaw spalling we see on the rest of the stack. Either way, the fix depends on what you actually have on top.
What Does It Cost to Fix Either One?
A replacement chase cover typically runs $300–$800 depending on size and metal, while a masonry crown repair or rebuild typically runs $450–$1,800–plus depending on size and whether it’s a coating, a repair, or a full rebuild — both are typical ranges, not quotes.
If you’re not sure which one applies, a photo from the ground or a quick look with binoculars usually settles it before anyone climbs a ladder. See our full chimney repair cost breakdown for the rest of what typically comes up on a masonry chimney.
Common Questions
Do you install or repair chase covers on factory-built chimneys?
We focus on masonry chimney work — brick, block, and the crown. For a factory-built chase cover, a chimney sweep or the manufacturer’s installer is the right call, and we’ll say so rather than take on work outside our lane.
Can a cracked masonry crown be sealed instead of rebuilt?
Often yes, if the cracking is minor and the slope still sheds water. A crown coating or sealant buys years; a crown that’s badly cracked, flat, or spalling usually needs a full rebuild.
Is a rusted chase cover an emergency?
Not usually, but water getting past it can damage the chase framing and insulation over time, so it’s worth scheduling before the next wet season rather than waiting for a leak inside.
Not sure if your Lexington-area chimney is masonry or factory-built? Call or text (859) 310-1209 and describe what you see on top — we’ll tell you straight whether it’s our work or point you the right direction.
Related: Chimney Crown Repair & Rebuild | Chimney Repair Cost in Lexington, KY | Chimney Cap Replacement
Source: Chimney Safety Institute of America — Carpentry, Chase & Crickets.
Last updated: September 29, 2026