Penn Ohio Roofing
Chimney Crown Repair and Replacement in Western PA and Eastern Ohio
Cast crowns with real slope, overhang, and drip edge — the top of the stack done right.
The crown is the sloped concrete slab across the top of a chimney that sheds water off the masonry and away from the flue. It is the most exposed surface on the entire house and the single most common entry point for chimney leaks. When it cracks, water runs straight down into the brick and mortar below, and every freeze-thaw cycle widens the crack that let it in.
Why crowns crack
Many crowns were never built as crowns. A thin skim of mortar troweled flat across the top of the brick — sometimes called a wash — has no reinforcement, no meaningful slope, and no overhang past the face of the stack. It cracks within a few winters because mortar is not a structural cap material and because water sits on it instead of running off.
The second cause is thermal movement. The flue tile heats and expands at a different rate than the surrounding masonry. A crown poured tight against the tile with no expansion joint gets pulled apart from the middle out, which is why so many cracks radiate from the flue opening.
What a correctly built crown includes
A proper crown is cast concrete, not troweled mortar. It slopes from the flue toward the outside edge so water moves, and it overhangs the brick face by roughly an inch to two inches with a drip edge cut into the underside so runoff falls clear of the wall instead of running back down the brick.
It is reinforced, it is thick enough to resist cracking, and it is separated from the flue tile with a flexible expansion joint so the tile can move without splitting the slab. When a crown fails, we also check the joints and flashing below it, because a leaking crown has usually been feeding water into that masonry for years.
What the Work Involves
- 1Inspect the crown, flue tile, and top courses of brick, with photos from the roof.
- 2Remove failed crown material or the old mortar wash down to sound masonry.
- 3Repoint the top courses of brick if the joints beneath the crown have opened.
- 4Form and cast a reinforced crown with slope from the flue to the outer edge.
- 5Build in a 1–2 inch overhang past the brick face with a drip edge underneath.
- 6Set a flexible expansion joint between the crown and the flue tile.
- 7Cure and seal appropriately, then install or reset the cap over the flue.
What Failure Looks Like
- Visible cracks across the top slab, often radiating from the flue
- Chunks of concrete or mortar found on the roof or in the gutters
- Staining or damp brick on the upper courses of the stack
- Interior stains near the chimney chase after heavy rain
- A flat top with no overhang past the brick face
- Loose or missing cap sitting on a deteriorated crown
What Drives the Cost
We do not publish fixed prices for masonry work, because no two chimneys or walls are the same and an honest number requires seeing the structure. These are the factors that move the estimate up or down:
- Chimney footprint — a two-flue stack takes far more material than a single
- Whether the existing crown is patched, resurfaced, or fully recast
- Height and access, including staging or lift requirements
- Condition of the brick courses beneath the crown
- Whether cap and flue work are bundled into the same visit
- Weather window, since cast material needs suitable curing conditions
Insurance Claim Assistance
Sudden damage — a lightning strike, a wind event, or a tree impact — is typically treated as a covered claim. Gradual deterioration from age and freeze-thaw is typically treated as maintenance and excluded. We document the condition either way with photos and work directly with your adjuster when there is a claim to file. We do not promise coverage.
Financing Available
Chimney Crowns work is often unplanned. We offer the same financing options as our roofing projects, so the repair can be spread across manageable monthly payments instead of coming out of savings all at once.
Financing OptionsRelated Services
Chimney Crowns — Frequently Asked Questions
- What is a chimney crown and why does it crack?
- The crown is the sloped slab across the top of the chimney that sheds water away from the brick and flue. It cracks when it was built as a thin mortar wash instead of cast concrete, when it has no slope or overhang, or when it was poured tight against the flue tile and thermal movement split it.
- Can a cracked crown be sealed instead of replaced?
- Hairline cracks in an otherwise sound, properly shaped crown can be treated with a flexible crown coating. If the slab is broken through, missing pieces, has no overhang, or is a thin mortar wash, sealing only hides the problem. We will tell you which one you have and show you photos.
- How much overhang should a crown have?
- Roughly one to two inches past the face of the brick, with a drip edge cut into the underside. That geometry throws runoff clear of the wall. A crown poured flush with the brick sends every drop of water straight down the face and into the joints below.
- Does a bad crown cause interior leaks?
- Frequently. Water passing a cracked crown travels down inside the stack and shows up as ceiling or wall staining near the fireplace, often several feet from the chimney. Homeowners usually suspect the roof first, which is why we inspect the crown, joints, and flashing as one assembly.
- How long does crown replacement take?
- Most crown recasts are a one to two day job on site, plus curing time before the cap goes back on. Access and stack size drive the schedule more than the crown itself — a tall two-flue stack with staging takes longer than a single-flue crown on a low roof.