Diagnostic-led chimney rebuilds, crown reconstruction, lead and stainless flashing, and listed stainless liner installation across the Greater Toronto Area.
Free On-Site Quote
Call or email directly for the fastest, most accurate quote — usually scheduled within 1 business day.
Problem & Risk Analysis
A failed chimney is rarely a cosmetic issue — it is a freeze-thaw failure of the mortar joints, a cracked crown wash letting water into the flue, or a corroded steel flashing apron dumping rain behind the brick. Once moisture is inside the stack, every winter cycle accelerates spalling, displaces brick courses above the roof line, and eventually condemns the structure.
Fadom Construction begins every chimney call with a top-down inspection — checking the crown integrity, mortar joint condition, flashing seal, and flue liner for cracks or acid pitting. The diagnosis dictates scope: a sealed crown and re-flash for a minor leak, course-by-course repointing for active mortar failure, or a full above-roof rebuild when displacement and spalling exceed safe service life.
Every rebuild is detailed to Ontario Building Code Part 9.21 for masonry chimneys — including correct minimum clearances to combustibles, listed stainless liner sizing per appliance BTU, and lead or stainless step-and-counter flashing terminated into the brick — not face-caulked over the shingles.
Technical Service Breakdown
When mortar joints have failed below the top three courses and brick has displaced or spalled, the chimney is dismantled to the roof line and rebuilt in matched brick bedded in Type S mortar. A new pre-cast or cast-in-place crown wash is poured with drip kerf, and the assembly is re-flashed in lead or stainless.
Cracked crowns are demolished and replaced with a 100 mm cast-in-place wash sloped to drain, with bond-break around the flue tile and a 50 mm overhang with drip kerf. Surface-coating a failed crown with sealant is a short-term band-aid — Fadom rebuilds the crown to a 25-year service life.
Cracked clay flue tiles or oversized chimneys for modern high-efficiency appliances are corrected with a listed UL-1777 stainless liner sized to the appliance BTU input — insulated where required for combustibles clearance, and capped with a code-compliant rain cap and spark arrestor.
Materials & Specifications
| Category | Material / Specification | Engineering Notes |
|---|---|---|
| Mortar Type | Type S (1800 psi compressive), Type N for heritage soft brick | Type S above roof line for freeze-thaw exposure |
| Crown Material | Cast-in-place concrete 3500 psi, pre-cast crown, brick rowlock with cement wash | Min. 100 mm thick, 50 mm overhang, drip kerf |
| Flashing | Lead 2.5 lb/ft², stainless 26 ga., step + counter detail | Counter-flashing reglet-cut and lead-wedged into brick |
| Liner | UL-1777 stainless steel 304 or 316L, ovalized or round, insulated | Sized to appliance BTU per NFPA 211 / OBC 9.21 |
| Cap | Stainless rain cap with bird/spark screen, multi-flue caps | Required by OBC for wood-burning appliances |
Code Compliance
All Fadom chimney work is detailed to Ontario Building Code Part 9.21 (Masonry Chimneys & Flues) and NFPA 211 for liner sizing. GTA chimneys see approximately 50 freeze-thaw cycles per winter — Type S mortar (1800 psi minimum compressive strength) is specified above the roof line for that exposure, and crowns are poured with a 50 mm drip-kerfed overhang to shed melt water clear of the brick face. Insurance reports and WETT-style condition assessments available on request.
Service Area
Chimney Repair & Rebuilds installed across 10 cities across the Greater Toronto Area. Select your city for local pricing, lead times and recent installs.
Free on-site assessment, fixed-price quote, written workmanship warranty.
