Flashing & Details
Walls, chimneys, skylights, vents. Step/headwall flashings, sealants, transitions.
Leak Diagnostics — What We Check First
Our roof repair in Toronto process starts with correct leak diagnostics to avoid repeat issues.
Field Condition
Tabs, membranes, seams, splits, blisters, hail marks. Photo report with plan.
Drainage
Ponding, clogged eaves, scuppers, downspouts, slope (≈1/4″ per ft target).
Attic/Ventilation
Moisture/heat patterns that mimic leaks. Intake + exhaust balance.
Substrate
Deck integrity: cores on flat roofs; probe tests on wood sheathing.
Evidence Map
Interior stains, optional IR/thermal, controlled hose testing by zone.
Shingle Damage — Top 9 Causes
Common shingle issues we see during roof repair in Toronto include wind damage, nail pops, and flashing errors.
Wind Blow‑off
Unsealed tabs; missing or lifted shingles allow water entry.
Nail Pops
Backed‑out fasteners create holes and raised tabs.
Improper Nailing
High/over‑driven nails; reduced pull‑through strength.
Valleys/Flashing
Open or corroded valley metal; poor step/headwall detailing.
Heat/Age
Granule loss, brittleness, cracking; UV degradation.
Ventilation Issues
Trapped moisture/heat ages shingles; ice dams in winter.
Manufacturing Defect
Rare; pattern blistering/fishmouths — document for claim.
Hail/Impact
Fractured mats or bruising; accelerated aging and leaks.
Algae/Moss
Moisture retention and wicking; decay at laps.
Flat Roof — When Replacement Makes Sense
For commercial and low-slope roof repair in Toronto, these are the signs replacement may be smarter than patching.
Wet System
IR + cores show >25–30% saturation of insulation/mats.
Recurring Leaks
≥3 leak events/yr across different zones despite repairs.
End‑of‑Life
BUR 20–25y, Mod‑bit 15–20y, TPO 15–20y, EPDM 25–30y.
Attachment Fail
Fastener pull‑out, poor adhesion, or deck rust/rot.
Alligatoring
Brittle surface, granule loss; patches won’t bond/last.
Splits/Seams
Defects on >10–15% of field or laps.
Ponding
Water >48h; slope <1/4″/ft; drains can’t be corrected.
Code/Ins.
Two layers already; R‑value/fire upgrades required.
Economics
12‑mo repairs >30–40% of replacement cost.
Slate Roof — Repair vs Replace
During roof repair in Toronto on slate systems, failures are often limited to flashing or fasteners.
Broken/Slipped Slates
Storm or foot traffic; replace with copper nails/hooks.
Nail Sickness
Rusting iron nails fail; re‑nail with copper/stainless.
Flashing Failure
Valleys/chimneys; upgrade to copper with proper steps.
Patch Cement
Old tar patches trap water; remove and re‑detail.
Hail/Impact
Cracks/chips; selective replacement typically viable.
Delamination
Poor‑quality slate layers peel; assess field % damage.
Underlayment
Expired felt on older installs; add eave ice‑shield during repairs.
Structure
Check deck/sag; slate is heavy — verify load path.
Economics
Wide failures >20–30% → discuss sectioned re‑slating.
Cedar Roof — 8 Reasons to Replace
Splits/Curling
Felt/deck visible; widespread failure.
Recurring Leaks
Multiple areas despite past patching.
Rot/Moss
Decay between shakes; moisture retention.
Fastener Corrosion
Loose/falling shakes from rusted nails.
Deck Damage
Structural sagging or compromised sheathing.
Hail Fractures
Across many courses; systemic damage.
End‑of‑Life
Severe weathering; brittle and thin.
Fire‑Rating Upgrade
Class A/B requirements with reroofing.
Metal Roof — 6 Common Leak Sources
Metal details are frequent sources during roof repair in Toronto; these are the usual culprits.
Backed‑out Fasteners
Washer cracks; retighten and replace with proper gaskets.
Open Seams/Laps
Capillary action; re‑seal or add stitch screws as designed.
Aged Sealants
Ends/ridges cure out; replace with compatible sealants.
Penetrations
Pipe boots & details split; retrofit boots or curbs.
Flashing Gaps
Wall/chimney details; add counter‑flashing.
Condensation
Mimics leaks; address insulation & ventilation.
Eaves, Soffit & Fascia — When to Replace
Rotten Wood
Soft fascia/soffit; fasteners won’t hold.
Chronic Overflow
Undersized or clogged; upgrade runs/guards.
Leaky Seams
Corners/joints drip; reseal or replace sections.
Bad Pitch
Back‑pitch/no pitch; standing water.
Pulling Away
Upgrade hangers/spikes to hidden hangers.
Dents/Impacts
Hail/ladder damage reduces capacity.
Vent Intake
Target ~1:300 NFA; clear soffits/baffles.
Animal Entry
Soffit gaps; repair screens & closures.
Corrosion
Oxidation/pinholes; replace affected runs.
Edge Upgrades
Drip edge & ice‑shield with reroof.
Recent Case Studies
![Roof repair in Toronto — residential shingles re[space]roof with improved ventilation](https://qualityroofingservices.ca/wp-content/uploads/2024/09/20230411_164953-scaled.jpg)
Service Areas
Toronto, East York, North York, Etobicoke, Scarborough, Vaughan, Richmond Hill, Thornhill, Woodbridge, Mississauga, Oakville, Kleinburg, Bolton.
Roof Repair — FAQ
Do you offer same‑day emergency repair?
Yes — we triage active leaks first, with temporary or permanent repairs as needed. Call 416‑666‑0798.
Which systems do you service?
Shingles, torch‑on SBS, TPO, EPDM, PVC, metal details, skylights, vents, and flashings.
Are you licensed, insured, and WSIB covered?
Yes — safety and coverage are standard on every job.
How fast is a typical diagnosis?
Most assessments are same‑day with photo documentation and a written plan.
External Resources
Helpful official resources related to roofing and maintenance: