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Chimney Caps & Crowns in Mokena, IL

The cap and crown are your chimney’s roof. When they fail, rain, snow, and animals get straight into the flue and the masonry. We install new caps and repair or rebuild crowns to keep the top of your chimney sealed.

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Two components protect the top of your chimney. The crown is the sloped concrete or mortar slab that covers the top of the masonry and sheds water away from the flue. The cap is the metal cover that sits over the flue opening itself, keeping rain, animals, and debris out while still letting smoke escape. Together they are the first line of defense against the number-one enemy of any chimney: water. When either one is missing or damaged, everything below it starts to deteriorate faster.

Global Chimney Sweep installs stainless steel caps and repairs or rebuilds crowns for homeowners across Mokena and the south suburbs. These are among the most cost-effective things you can do for a chimney, because a small investment at the top prevents expensive water damage throughout the structure. We size caps to your flue, use materials that stand up to Chicago winters, and quote the work up front.

What a Cap and Crown Do

Keep Rain Out

A cap covers the flue opening and the crown sheds water off the top, so rain does not pour straight into the chimney and soak the masonry.

Block Animals

Birds, squirrels, and raccoons love an open flue. A cap with mesh keeps them from nesting in or falling into your chimney.

Stop Debris

Leaves and twigs that fall into an uncapped flue can block the draft and even become a fire hazard. A cap keeps them out.

Arrest Sparks

The mesh on a cap also acts as a spark arrestor, helping keep embers from landing on your roof.

Signs Your Cap or Crown Needs Attention

Look for these: a missing or visibly rusted, dented, or dislodged cap; cracks, gaps, or crumbling in the concrete crown at the top of the chimney; water in the firebox or a damp, musty smell after rain; animal sounds or nesting material in the flue; or debris and leaves in the firebox. A cracked crown is especially important to catch early — water that gets through a failed crown travels down into the chimney structure and causes the kind of freeze-thaw damage that leads to major masonry repairs. Sealing or rebuilding it is far cheaper than fixing what a leak destroys.

Caps and Crowns We Provide

New Cap Installation

Stainless steel single- or multi-flue caps sized and secured to fit your chimney and keep water and animals out for years.

Cap Replacement

Swapping out a rusted, damaged, or improperly sized cap for one that actually protects the flue.

Crown Sealing

Applying a flexible crown coating to seal hairline cracks and extend the life of a crown that is still structurally sound.

Crown Rebuild

Rebuilding a badly cracked or crumbling crown with proper slope and overhang so it sheds water correctly.

A cap or crown problem often shows up alongside other masonry damage. We can handle it all in one visit.

Frequently Asked Questions

What is the difference between a chimney cap and a crown?
The crown is the sloped concrete or mortar slab that covers the top course of masonry and sheds water away from the flue. The cap is the metal cover that sits over the flue opening to keep out rain, animals, and debris while letting smoke escape. You typically need both, and they work together to protect the top of the chimney.
Do I really need a chimney cap?
Yes, in almost every case. An uncapped flue is an open invitation for rain, animals, and debris, all of which cause damage and blockages. A cap is inexpensive relative to the problems it prevents, which is why it is one of the first things we recommend for an unprotected chimney.
How long does a chimney cap last?
A quality stainless steel cap can last many years, often with a long warranty. Cheaper galvanized caps rust out faster in our climate. We install stainless because it holds up to the freeze-thaw cycles and moisture of Chicago-area winters.
Can a cracked crown be sealed, or does it need rebuilding?
It depends on the severity. Hairline cracks in a crown that is otherwise sound can often be sealed with a flexible crown coating. A crown that is crumbling, badly cracked, or lacks proper slope and overhang usually needs to be rebuilt so it actually sheds water. We inspect it and tell you which one you are dealing with.
There is an animal in my chimney. Can a cap help?
A cap with mesh prevents animals from getting in going forward. If one is already nesting in the flue, that needs to be addressed first, and then a properly installed cap keeps the next one out. We can advise on the right sequence when you call.
Will a cap stop my chimney from leaking?
A missing cap is a common leak source, so installing one often solves the problem of rain going straight down the flue. But leaks can also come from a cracked crown, failed flashing, or porous masonry, so we check all of those. Sometimes the fix is a cap; sometimes it is a combination.
Can you install a cap on a multi-flue chimney?
Yes. Chimneys with more than one flue can use individual caps or a single multi-flue cap that covers the whole top. We measure your chimney and recommend the option that seals it best and looks right.
How much does a cap or crown job cost?
Cap installation is one of our more affordable services, and crown work depends on whether it needs sealing or a full rebuild. We quote every job up front after seeing the chimney. See our pricing page for starting prices, or call for a quote specific to your setup.

Seal the Top, Protect the Whole Chimney

A new cap or a repaired crown is one of the smartest, most affordable ways to prevent expensive water damage. Get yours quoted today.

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Published July 29, 2026

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