The chimney crown — sometimes called the “wash” in older trade vocabulary — is the concrete or mortar cap that sits at the very top of the masonry chimney, surrounding the flue tile (or stainless liner termination) at the center and overhanging the brick face on all four sides. A correctly built crown does four jobs simultaneously, every one of them critical:

1. Sheds water away from the flue. The crown surface is sloped at minimum 3 degrees (preferably 5-7 degrees) downward from the flue collar to the outer edge, so rainwater runs out and off rather than pooling against the tile.
2. Overhangs the brick face by a minimum of 2 inches (the NFPA 211 and CSIA-recommended spec is 4 inches minimum, and that is what PCE builds to). The overhang acts as a drip edge — water runs off the crown edge and falls clear of the brick rather than streaming down the masonry. Without proper overhang, every rainstorm bathes the upper courses of the chimney in runoff.
3. Provides a watertight seal around the flue tile. A sealant joint (typically high-temperature silicone or a flexible polyurethane) bonds the concrete crown to the flue tile so that movement between them does not crack the seal.
4. Carries the metal flashing tie-in that prevents water entry at the roof-to-chimney intersection. The crown’s geometry has to coordinate with the step flashing and counter-flashing details below.

A crown that fails any one of these four jobs allows water entry. Water is the single largest destroyer of masonry chimneys in DFW; freeze-thaw on saturated brick spalls the face off in chunks, and acidic condensate inside a wet flue eats out the mortar joints from the inside.

Crowns fail in a predictable sequence, and the speed of the cascade is what makes early intervention so high-value. The progression we see, year after year:

Stage 1 — Hairline Surface Cracks

The earliest visible failure. Hairline cracks (1/64 to 1/32 inch wide) appear in the crown surface, usually radiating outward from the flue collar. These open up because the original crown was poured too thin (under 2 inches), poured without rebar reinforcement, or poured without a bond break around the flue tile (which expands and contracts at a different rate than concrete). At Stage 1, a CrownCoat-style elastomeric repair is appropriate and effective. Cost range: $400-$-+.

Stage 2 — Open Cracks and Edge Spalling

Cracks have widened past 1/32 inch and water has begun freeze-thaw cycling within them. Edges of the crown begin spalling — small chunks of concrete pop off, exposing rebar (if any). At this stage, water is reaching the brick courses immediately below the crown. CrownCoat is no longer reliable; partial reconstruction or full rebuild is the right call. Cost range: $1,200-$-+.

Stage 3 — Structural Cracks Through to the Flue

The crown has cracked through its full thickness, water is freely entering the chimney structure, the brick courses below show efflorescence (white mineral deposits from water transport), and mortar joints are beginning to recede. Full crown demolition and rebuild is required. Cost range: $1,800-$-+.

Stage 4 — The Cascade

If Stage 3 goes unaddressed for 2-4 winters, the damage becomes a system failure. Spalled brick on the upper courses (replacement: $45-$-+ per brick), tuckpointing required across multiple faces ($2,000-$-+), flue tile cracking from internal saturation (relining: $3,000-$-+), and in worst cases a chimney that has shifted enough to require partial demolition and rebuild ($15,000-$-+). The crown is the cheapest piece of the chimney to maintain and the most expensive piece to neglect.

CrownCoat / Elastomeric Repair

CrownCoat (and equivalent products from ChimneySaver and SaverSystems) is a brushed-on or troweled elastomeric membrane designed to bridge hairline cracks and re-establish a waterproof surface on a structurally sound but cosmetically failed crown. It is the right answer when the underlying crown is dimensionally correct (proper thickness, proper slope, proper overhang, no missing chunks), and the failure mode is limited to surface cracking. CrownCoat carries a 10-year manufacturer warranty when applied by certified technicians and properly prepared. PCE applies CrownCoat with the manufacturer specified primer, two coats minimum, brought up onto the flue tile and out onto the crown overhang. Cost range: $400-$-+.

CrownCoat is not the right answer when:

• The crown is under 2 inches thick (it lacks the structural mass to flex without re-cracking)
• The crown lacks the 2-inch minimum overhang past the brick face
• The slope is flat or back-pitched toward the flue
• Cracks exceed 1/8 inch in width
• Edge spalling has exposed rebar or removed material

Full Reinforced Concrete Rebuild

When the existing crown fails any of the dimensional or structural tests above, a full demolition and rebuild is required. PCE rebuilds crowns to NFPA 211 / CSIA spec: minimum 2.5 inches thick at the thinnest point, sloped 5-7 degrees outward, 4-inch minimum overhang past the brick face on all four sides, reinforced with #3 rebar or 6×6 W2.9 welded wire mesh, bonded to the existing brick with mortar, isolated from the flue tile with a flexible bond break (so differential thermal movement doesn’t crack the new pour), and finished with high-temperature sealant at the flue collar. The rebuild takes 6-10 hours of mason time plus 7-day controlled cure under cover. Cost range: $1,800-$-+.

Every full rebuild PCE pours is registered into the lifetime workmanship warranty — for as long as you own the home.

1. Assessment and Documentation

On-roof inspection with photographs from all four faces and the top. Measurement of crown thickness, slope, overhang, and crack width. Documentation of any related damage (efflorescence, spalled brick, flashing failure) for the file and the quote. We share the photos with you before quoting.

2. Demolition

The failed crown is broken out with a 4.5-inch grinder and a small sledge, taken down to the topmost brick course. Debris is bagged and removed. The flue tile is inspected for cracking; if compromised, we recommend addressing it as part of the same job (see our chimney relining page).

3. Form Building

A custom plywood form is built on-site for the new crown. The form establishes the outer dimension of the overhang (4 inches past the brick face on all sides), the inner cutout around the flue tile, and the slope from flue to outer edge. The form is fastened to the brick with masonry screws and lined with form-release.

4. Reinforcement and Bond Break

#3 rebar (3/8 inch) or 6×6 W2.9 welded wire mesh is laid into the form on 1.5-inch chairs so the steel sits at mid-thickness. A compressible bond break (closed-cell foam or felt) is wrapped around the flue tile to isolate it from the concrete pour — this is the single most-skipped detail on cheap rebuilds and the leading cause of cracked crowns within 2-3 years of a “professional” pour.

5. Concrete Pour

5,000 psi reinforced concrete (Quikrete 5000 or equivalent) is mixed to a stiff slump, poured into the form, vibrated to release air voids, and screeded to the slope dimension. The mason finishes the surface with a steel trowel, profiles the overhang drip edge, and brushes a non-slip texture into the wash surface.

6. Controlled Cure

The pour is misted and covered with damp burlap and poly for the first 72 hours, then poly-only for an additional 4 days. This 7-day controlled cure is the difference between a 5-year crown and a 50-year one. Concrete cured too fast develops shrinkage cracks and weak surface; controlled cure produces full hydration of the cement matrix and design-strength concrete.

7. Sealant and Flashing Tie-In

After cure, the flue collar is sealed with high-temperature silicone (Permatex Ultra Black or equivalent). If the flashing detail at the chimney-roof intersection requires repair (which it usually does, because crown failure often coincides with flashing failure), we coordinate with the homeowner’s roofer or perform the flashing work ourselves under a separate scope.

North Texas chimneys lose their crowns faster than chimneys in most of the country. Three drivers, every job:

Freeze-Thaw Cycling — 28+ Days Per DFW Winter

DFW averages 28-35 freeze-thaw days per winter. Every cycle drives water deeper into hairline crown cracks, and every freeze expands that water by 9% in volume. Concrete that started with a single hairline crack ends a winter with a 1/16-inch open crack. Three winters and the crack reaches the rebar. Five winters and the crown has spalled at the edges.

Hail Impact

The DFW hail belt produces 1-3 major hail events per year. Hail does not crack a properly built crown (2.5+ inches of reinforced concrete shrugs off softball-sized stones), but it absolutely shatters the under-built crowns common on 1980s-2000s construction — the 1.5-inch unreinforced mortar wash that production-builder masons poured before crown-rebuild best practices were widely adopted. We track NOAA SPC reports and inspect customer crowns after major hail events; insurance often pays for the rebuild.

Thermal Cycling and UV

Surface temperature on a DFW chimney crown swings from 25°F on January nights to 160°F on August afternoons — a 135°F differential that drives expansion-contraction cracking, especially around the flue tile where the concrete and tile expand at different rates. Without a proper bond break, the crown cracks at the flue interface within 5-10 years.

Crown work pricing on DFW chimneys breaks into two tiers:

CrownCoat / Elastomeric Repair

• Standard CrownCoat application (single-flue, average crown size): $400-$-+
• Crown patching + CrownCoat (small spalls + membrane): $900-$-+
• Major patching + CrownCoat + sealant refresh: $2,400-$-+

Full Reinforced Concrete Rebuild

• Single-flue stack, average crown: $1,800-$-+
• Double-flue stack: $3,200-$-+
• Tall stack or difficult access: $4,800-$-+
• Add: flashing repair at chimney-roof tie-in: $400-$-+

Every quote is itemized, in writing, and registered into our lifetime workmanship warranty at sign-off.

Case Study 1 — Westlake: Full Rebuild on a 1998 Custom Estate

A 6,400 sq ft custom on Vaquero Club Drive, original 1998 construction, double-flue stack. The homeowner discovered water staining on a master bedroom ceiling after a March storm. Our inspection found the original 1998 crown was 1.25 inches thick (under-spec), unreinforced, and pitched flat — three faces had cracked through to the flue. We demolished both flue crowns, rebuilt with #3 rebar, 5,000 psi concrete, 4-inch overhang, 6-degree slope, and bond-broke flue isolation. We coordinated with the homeowner’s roofer for flashing tie-in. Total cost: $5,400. Insurance paid $3,800 as hail-related damage with our written documentation. Lifetime warranty registered. Call 682-226-6257.

Case Study 2 — Trophy Club: CrownCoat on a 2008 Production Home

A 3,400 sq ft Highland Homes build in Trophy Club, original 2008 crown structurally sound but with three hairline cracks radiating from the flue. The homeowner had been quoted full rebuild at $4,200 by a competing chimney company. Our inspection confirmed the underlying crown was 2.25 inches thick, properly sloped, properly overhung — a good crown with cosmetic surface failure. We applied ChimneySaver CrownCoat with primer + two finish coats, brought up onto the flue and out over the drip edge. Total cost: $650. Saved against rebuild quote: $3,550. 10-year CrownCoat warranty + lifetime workmanship warranty registered.

Case Study 3 — Southlake: Post-Hail Rebuild After May 2025 Storm Event

A 4,800 sq ft Carillon home struck by the May 2025 Southlake hailstorm — softball-sized stones shattered the 1.5-inch original crown across the entire surface. Insurance adjuster initially offered $1,400; with our written technical report (photos, depth measurements, code comparison to NFPA 211), the adjuster approved $4,200 for full rebuild. We poured a 2.75-inch reinforced crown with 4.5-inch overhang and bond-broke flue isolation, cured under cover for 7 days. Lifetime warranty registered.