Crown replacement
Crumbling or badly cracked crowns are removed and recast that sheds water past the brick.
Masonry Repair
Chimney Crown Repair Millstadt, IL
A Millstadt chimney technician can repair the crown, the concrete slab that seals the top of the chimney around the flue, so rain stops soaking into the brick from above. Call (618) 476-0260 to reach a local chimney sweep.
At the very top of a masonry chimney sits the crown, a sloped slab that seals the brick around the flue and sheds rain. It takes more weather than any other part of the chimney, so it is often the first thing to crack. Once it cracks, water runs straight into the brick and mortar below, and every freeze widens the crack.
A crown is not the same as a chimney cap, though the words are often mixed up. The crown is the masonry slab, while the cap is the metal cover with a mesh screen that sits over the flue opening. A new cap will not stop water from soaking in through a cracked crown.
Many crowns crack early because of how they were built. Many original crowns are thin mortar caps rather than proper concrete, with no drip edge and the flue tile locked tight in the mix. Mortar is not meant for that job, and a flue tile that heats and expands will crack a crown that is cast tight against it.
Chimney Crown Repair is often paired with chimney cap installation and chimney leak repair, depending on the cause.
Dealing with this in Millstadt, IL right now? Call (618) 476-0260 to talk to a local chimney sweep.
Call nowThe process
What happens during a crown repair
The right fix depends on whether the crown is basically sound with surface cracks or failing all the way through.
Assess the cracks
From the roof, the crown is examined for cracks, crumbling, poor slope and missing overhang. Damage to the top courses of brick or the flue tile is noted too.
Remove loose material
Any crumbling material is chipped away and the surface is prepared. Skipping prep is the main reason crown patches peel off.
Apply crown sealer
Hairline cracks in an otherwise sound crown are filled and the whole crown is coated with a flexible, elastomeric crown sealer. It is the least invasive fix when the crown is still intact.
Rebuild if needed
If the crown is crumbling, thin or cracked through, it is removed and a new one is formed and cast. The new crown is sloped, overhangs the brick with a drip edge and is thick enough to resist cracking.
Flue tile joint
The crown is separated from the flue tile by an expansion joint sealed with flexible material. Without it, the hot flue tile will crack a new crown just like the old one.
Cap the flue
A chimney cap is installed or reset over the flue once the crown has cured. Any spalled brick at the top can be repaired at the same time.
What is included
What crown repair covers
Drip edges
New crowns are built to overhang the brick with a groove underneath so water drips clear instead of running down the brick.
Top course repair
Damage to the top courses from a leaking crown is fixed in the same job so the new crown sits on sound masonry.
Crown sealer
Hairline cracks are sealed with a flexible crown coating before water and frost can widen them.
Expansion joints
The joint between the crown and flue tile is opened and sealed with flexible material to prevent the most common type of crown crack.
Related service
Chimney Crown Replacement Millstadt, IL
When a crown has deep cracks, loose chunks or no overhang at all, replacing it is more reliable than sealing it. Replacement starts with removing the old crown and inspecting the masonry underneath. Forms are set to create the overhang, the flue tile is wrapped to allow movement, and concrete is placed and sloped away from the flue.
In Millstadt, the weather affects when a crown can be replaced. Because new concrete is vulnerable to frost while it cures, crown work is easier outside the coldest months. A winter crown failure can often be sealed temporarily to buy time until warmer weather. Ask the chimney sweep whether the new crown will have an overhang, a drip edge and an expansion joint at the flue, since those three details decide how long it lasts.
Local help
Chimney Crown Repair Near Me
In Millstadt, a crown that looked fine in the fall can be cracked by spring. Homes in Millstadt and nearby towns like Smithton, Belleville, Columbia and Dupo include plenty of older chimneys whose crowns were troweled from mortar rather than built as proper concrete crowns, so sealing cracks early or replacing a poorly built crown protects the rest of the chimney.
For chimney crown repair in Millstadt, IL or nearby towns like Smithton, Belleville, Columbia and Dupo, call (618) 476-0260 to reach a chimney sweep who covers your street.
How the weather here affects chimneys around Millstadt
Winters here are cold and long, with lake effect snow in many towns and deep cold snaps that can last for days. Heating systems and wood stoves work nearly nonstop for months, so flues collect creosote fast and liners and crowns see a lot of heat and cold. Snow that piles up behind a chimney and melts slowly is a common source of leaks at the flashing. That is why Millstadt chimney sweeps are busiest every September and October.
Why call
Why act early
Less damage
Small chimney problems caught early usually stay small repairs.
Familiar with local homes
Local sweeps see the same chimney types and weather wear across Millstadt and nearby towns.
Straight answers
Ask the sweep about the cause, the options and the estimate before work starts.
Chimney Crown Repair FAQ
What causes chimney crowns to crack?
Crowns crack from water freezing in small cracks, from being built thin out of mortar, and from the flue tile expanding against them. Many crowns are troweled from mortar mix with no overhang and no gap around the flue tile, so they crack within a few years. Each freeze after that makes the crack wider.
What is the difference between a chimney crown and a chimney cap?
The crown is the concrete or mortar slab that covers the top of the masonry around the flue, and the cap is the metal cover that sits over the flue opening. The crown keeps water out of the brick, and the cap keeps rain, animals and debris out of the flue. Adding a cap will not fix crown damage.
Do I need a new crown if mine is cracked?
How far the cracking goes decides it. Minor surface cracks are usually sealed with an elastomeric crown sealer. If the crown is cracked through, crumbling or missing pieces, replacement is the better option.
How long does a chimney crown last?
How long a crown lasts depends mostly on how it was built. The weak ones are thin, flush with the brick and cast tight to the flue. Having the crown checked each year lets you seal cracks before replacement is needed.
How serious is a cracked chimney crown?
Small crown cracks deserve attention because they let water straight into the chimney. Once water reaches the masonry, it leads to spalled brick, failing mortar, rusted dampers and damaged flue tiles. Fixing it now is far easier than repairing the masonry damage later.
More questions? Call (618) 476-0260
Other services that may help
Chimney Cap Installation
Fitting a metal cap over the top of the flue so water, birds and debris stay out of the flue.
Learn moreChimney Leak Repair
Finding and stopping water that gets in through the crown, cap, flashing or brick, before the water rots framing or ruins the flue.
Learn moreChimney Masonry Repair
Brick and mortar repair for weathered or damaged chimneys, before freeze-thaw damage spreads.
Learn moreChimney Waterproofing
Treating chimney brick and mortar with a breathable water repellent, applied after repairs so the brick sheds water but can still dry out.
Learn more
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