What is a chimney crown, and how is it different from a chimney cap or chase cover?
A chimney crown is the sloped concrete or masonry slab on top of a brick or stone chimney — it sheds rain off the top and away from the flue. That's different from a cap, the metal-and-mesh lid over the flue opening itself, and a chase cover, the metal top on a framed prefab chimney chase where a masonry crown would be.
The crown: the chimney's roof
A chimney crown is the sloped slab of concrete or mortar poured across the top of a masonry chimney, around the flue tile. Its whole job is to shed water — rain and snowmelt hit the crown and run off and away from the flue and the brickwork below instead of soaking in. It's the chimney's roof. Up here that slab takes a beating: our freeze-thaw winters work into any hairline crack, and a cracked crown is one of the most common ways water gets into a WNC chimney and quietly wrecks it from the top down.
Cap and crown are not the same thing
People mix these up constantly. The cap is the metal-and-mesh lid that sits over the flue opening itself — the actual hole the smoke comes out of. It keeps rain, birds, squirrels, and leaves out of the flue, and its mesh acts as a spark arrestor so embers don't land on your roof. The crown is the big masonry slab the cap sits up out of. A chimney can have a good cap and a failing crown, or the reverse — they do different jobs, and you want both intact and doing their part.
The chase cover: a prefab's version of a crown
If your fireplace is a factory-built prefab, its chimney usually runs up inside a framed enclosure called a chase, finished with siding to look like a masonry chimney. That chase is topped not with a concrete crown but with a chase cover — a fitted metal lid that does the crown's water-shedding job. Chase covers can rust or pool water if they're the wrong metal or poorly pitched, which is a frequent source of leaks in prefab systems. Crown, cap, chase cover — when we inspect a chimney we check all three, because water getting past any of them is what turns a small repair into a big one. Call (828) 545-0525.
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