Crack sealing
Small cracks in a sound crown are sealed before water and frost can widen them.
Masonry Repair
Chimney Crown Repair Avonmore, PA
A chimney sweep in Avonmore can seal hairline cracks in a chimney crown or rebuild a crown that is breaking apart, before water and frost turn small cracks into a rebuild. Call (724) 817-2006 to reach a local chimney sweep.
A chimney crown covers the top of the brick and slopes away from the flue so water runs off instead of soaking in. Sitting fully exposed at the highest point of the house, it takes a beating from rain, snow and sun. Water that gets through a cracked crown soaks the top courses of brick and expands as it freezes.
A crown is not the same as a chimney cap, though the words are often mixed up. A cap is metal and covers the flue opening, while the crown is concrete and covers the rest of the chimney top. Both matter, but a cap does nothing for a cracked crown.
Many crowns crack early because of how they were built. A common shortcut is a thin layer of mortar troweled over the top, with no overhang to throw water clear and nothing to let the flue tile expand. Mortar shrinks and cracks under weather, and an expanding flue tile will split a crown that has no room for movement.
Chimney Crown Repair is often paired with chimney cap installation and chimney leak repair, depending on the cause.
Need chimney crown repair in Avonmore? Call (724) 817-2006 to talk to a local chimney sweep.
Call nowThe process
The crown repair process
The right fix depends on whether the crown is basically sound with surface cracks or failing all the way through.
Assess the cracks
The crown is tapped and checked to see whether it is solid with surface cracks or breaking up. The cap and the upper masonry are part of the same check.
Remove loose material
Any crumbling material is chipped away and the surface is prepared. Repairs only hold on a clean, sound, dry surface.
Seal minor cracks
For minor cracking, a brushable crown repair coating seals the cracks and stretches with the concrete as it moves. It works well on a structurally sound crown with surface cracks.
Rebuild if needed
Crowns that are breaking apart are replaced rather than patched. The new crown is sloped, overhangs the brick with a drip edge and is thick enough to resist cracking.
Expansion joint
A bond break is left between the crown and the flue tile so the tile can expand without cracking the crown. Without it, the hot flue tile will crack a new crown just like the old one.
Protect the work
A chimney cap is installed or reset over the flue once the crown has cured. It is a good moment to repoint the top courses if needed.
What is included
Crown work a chimney sweep handles
Overhangs
An overhang with a drip edge is formed into the crown to protect the brick below.
Upper brick repair
Damage to the top courses from a leaking crown is fixed in the same job so the new crown sits on sound masonry.
Bond breaks
The joint between the crown and flue tile is opened and sealed with flexible material to prevent the most common type of crown crack.
Crown rebuilding
Thin mortar crowns are replaced that sheds water past the brick.
Related service
Chimney Crown Replacement Avonmore, PA
A crown that is breaking apart or was built from thin mortar usually needs to be replaced rather than coated. First the failed crown comes off, exposing the top of the brick and the flue tile. 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 Avonmore, 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. In the meantime, a temporary cover can keep the worst of the water out. It is worth asking how the new crown will handle water runoff and flue tile expansion.
Local help
Chimney Crown Repair Near Me
In Avonmore, a crown that looked fine in the fall can be cracked by spring. Across Avonmore and nearby places including Vandergrift, Delmont, Hyde Park and Murrysville, the crowns that crack first are the ones with no overhang and no room for the flue tile to move, and a properly built crown is one of the best investments in a chimney.
For chimney crown repair in Avonmore, PA or nearby towns like Vandergrift, Delmont, Hyde Park and Murrysville, call (724) 817-2006 to reach a chimney sweep who covers your street.
How the weather here affects chimneys around Avonmore
Winters here are long and cold, and the heating season usually runs from October well into April. The hardest thing on brick here is not the cold itself but the constant swing above and below freezing: rain and melting snow soak into the crown and joints, then freeze and push them apart, which is how cracks, loose bricks and leaks start. Nor'easters drive rain sideways into flashing and mortar that looked fine in summer. That is why chimney cleaning in Avonmore is usually booked in the fall, before the first cold night.
Why call
Why act early
Less damage
A chimney problem fixed early rarely spreads to the masonry, the liner or the house.
Sweeps who know Avonmore
Chimney sweeps in Avonmore know the chimneys and fireplaces common in local homes.
Straight answers
Ask the sweep about the cause, the options and the estimate before work starts.
Common questions about chimney crown repair
Is a chimney crown the same as 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. Each does a different job, so a good chimney needs both. A damaged crown needs its own repair.
How long does a chimney crown last?
A well-built crown can last a very long time, while a thin mortar crown may crack within a few years. Crowns made from mortar mix, with no overhang or no gap around the flue tile, fail much sooner. Yearly inspections, as NFPA 211 recommends, are the best way to keep an eye on it.
Can a cracked chimney crown be repaired?
That depends on how deep and widespread the cracks are. Minor surface cracks are usually sealed with an elastomeric crown sealer. A crown that is breaking apart or was built too thin usually needs to be replaced.
Is a cracked chimney crown a big deal?
A cracked crown is worth fixing quickly, even if the crack looks small. Water that gets through a crack soaks the brick and mortar, freezes and causes spalling, crumbling joints and leaks. Fixing it now is far easier than repairing the masonry damage later.
What causes chimney crowns to crack?
Weather, shortcuts in the original build and heat from the flue are behind most crown cracks. Many crowns are troweled from mortar mix with no overhang and no gap around the flue tile, so they crack within a few years. Water and frost then finish the job.
More questions? Call (724) 817-2006
Often needed together
Chimney Cap Installation
Fitting a metal cap over the top of the flue to keep out rain, animals, leaves and stray sparks.
Learn moreChimney Leak Repair
Tracing chimney leaks to the real entry point and sealing it, before the water rots framing or ruins the flue.
Learn moreChimney Masonry Repair
Fixing the brick, stone and mortar that hold a chimney together, with materials matched to the original masonry.
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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(724) 817-2006
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