roof (Home Systems)

Roof

• What this is: how a residential sloped roof works, how to inspect it safely from the ground and attic, when to call a roofer, and how to make the replacement decision — for a detached home in Metro Vancouver / coastal BC.
• Not: flat / low-slope membrane roofs (separate detailing); gutters (see gutters-drainage (Home Systems)); soffits and eaves (see soffits-eaves-fascia (Home Systems)); ceiling and attic damage once a leak has entered (see ceilings (Home Systems), attic (Home Systems)); strata common-property roofs where the strata corporation is responsible (see Strata reality section below for the detached-within-strata edge case).
• Figures: 2025–26 Metro Vancouver estimates — get your own quotes. Roof size, slope, access complexity, and material choice drive large ranges.

Bottom line

The rule (tripwire)

• If you see interior ceiling stains, wet attic insulation, or daylight through the decking → treat it as an active leak and call a roofer within days, not weeks. Water entering a roof cavity destroys framing, insulation, and ceilings below it; the longer it runs, the more the repair scope (and cost) expands.
• If your roof is approaching 15–20 years old (asphalt shingles) → shift from “fix when broken” to “plan proactive replacement.” Shingles in coastal BC’s wet, shaded, moss-prone climate often reach the end of useful life before the manufacturer warranty period; don’t wait for interior damage to force the decision on a bad timeline.
• If you see moss thick enough to lift shingle edges → schedule professional treatment, NOT pressure washing. Pressure washing strips the protective granules and voids your warranty.¹ This is the single most common owner-inflicted damage in Metro Vancouver.
• ALL on-roof work = a roofer. Fall from a residential roof is a leading cause of serious injury in BC. Ground-level and attic-side inspections are the owner’s entire scope; everything else goes to a professional.

Recurring upkeep

• Inspect twice a year (spring and fall) from the ground with binoculars: missing shingles, lifting edges, curling, granule loss, moss, and any visible flashing separation.
• Inspect the attic after every major rainstorm for the first few years in a new home, and annually thereafter: wet insulation, dark staining on rafters, daylight visible through decking.
• Keep the roof surface free of debris (leaves, branches, pine needles) — debris holds moisture and accelerates moss growth. A leaf blower or soft sweep from below; never a pressure washer.
• Maintain gutters and soffits — a blocked gutter backs water up under the drip edge; a blocked soffit kills attic ventilation, which shortens shingle life. Both are direct roof-health dependencies.

One-time setup

• Locate and photograph your roof’s flashing points (chimney, skylights, any pipe penetrations, all valleys) from the ground or with a phone camera extended on a pole. These are your primary watch points; build them into your inspection checklist.
• Find out when the roof was last replaced (building records, prior owners, permit history via your municipality). This date is the clock your replacement-planning window runs off.
• Identify a vetted roofer before you need one. Filling vendor-roster (Home Systems) ahead of an emergency beats negotiating under a leaking ceiling in November.

Standing facts

• Permit rules vary by municipality and scope. In Metro Vancouver, a full tear-off and re-roof often requires a building permit from your local municipal office; minor repairs (a few shingles, re-sealing flashing) generally do not. The contractor typically pulls the permit — but as the homeowner you bear responsibility if it is skipped.²
• There is no licensed-trade requirement for roofing in BC in the same way there is for gas or electrical. However, RCABC-member contractors employ Red Seal journeypersons and carry $10M liability insurance — the closest thing to a verifiable quality standard in the industry.³

How it works — the one thing that matters

A sloped roof sheds water by letting gravity do the work: rain hits the surface and runs downhill, layer by layer, from ridge to eave, and into the gutters. Every roofing system is a series of overlapping layers designed so that water always has somewhere to go — down, never under.

The load-bearing mechanism is sequenced overlap:

• Shingles overlap from the bottom of the roof upward, so each shingle covers the fasteners of the one below it. Water travelling downhill never reaches an exposed nail.
• Underlayment (synthetic or felt paper) sits between shingles and the roof deck. It is the secondary water barrier if a shingle is damaged or lifted.
• Flashing — metal strips at every penetration and transition point (chimney, skylight, valleys, pipes, wall-roof joints) — redirects water that would otherwise find a gap.
• The roof deck (plywood or OSB sheathing) is the structural substrate. It must stay dry; once it rots, the entire system needs replacement.

The coastal BC accelerant — moisture and shade. In Metro Vancouver, roofs face extended wet seasons, infrequent drying sun, and abundant tree shade. Moss thrives in these conditions. Moss holds moisture against the shingle surface, lifts the edges over time, and creates a path for water to travel uphill under the shingle — reversing the overlap mechanism. An untreated moss colony can shorten an asphalt shingle roof’s life by 5–10 years.⁴

So what: flashing fails first (accounting for an estimated 85% of roof leaks⁵), moss is the coastal accelerant, and the roof deck is the irreplaceable substrate. Inspecting the flashing and treating moss early protects everything downstream. → Flashing-Fails-Before-The-Field-Does — The Primary Roof Water-Ingress Mechanism (Home Systems)

Attic ventilation is a hidden roof-life multiplier. BC code requires approximately 1/300 of the insulated ceiling area as net free ventilation area, divided between continuous soffit intake and continuous ridge exhaust, with baffles maintaining a ≥ 63 mm clear airway above insulation.⁶ When this system fails — blocked soffits, absent ridge vent, missing baffles — moisture accumulates in the attic cavity, wets the deck, feeds mould on the sheathing, and shortens shingle life from below. Poor ventilation can rob a roof of 3–7 years of useful life.⁴ → Attic-Ventilation-Is-A-Roof-Lifespan-Multiplier-In-Coastal-BC (Home Systems)

What goes wrong, and the warning signs

Watch for	What it means
Water stain on ceiling below the roof	Active or recent leak — trace uphill in the attic; the stain may be 10–30 ft from the actual entry point5
Wet, compressed, or clumped attic insulation	Water has been entering; check rafters and decking for dark staining or softness
Daylight visible through the roof deck from the attic	Gap in the decking — a direct water pathway; a roofer, not just repair
Curling, cupping, or cracking shingles	Shingles past useful life — granule loss accelerates, water infiltration risk rises
Missing shingles or exposed decking	Immediate water-entry risk if it rains before repair
Bare or thin patches where granules are gone	Shingle material weathered away; common near eaves in high-runoff zones
Thick green or black moss	Moisture trapped under shingle edges; flap-test any lifted edges
Rust staining near chimney, skylights, or vents	Flashing has corroded — probably leaking or about to
Gaps, separated caulk, or visible daylight at flashing	Direct water entry; often shows up first at chimney counter-flashing
Sagging or soft spots on the roof deck (visible from attic)	Decking rot from prolonged moisture — structural; replacement scope
Granule-filled gutters	Shingles shedding protective layer — age-related; roof inspection warranted

What actually fails (the load-bearing failures):

• Flashing separation or corrosion — the primary source of leaks, especially at chimney, skylight, valleys, and pipe penetrations. Metal expands and contracts through BC’s freeze-thaw cycles, separating from sealant over time.⁵
• Moss lifting shingle edges — coastal BC’s signature failure mode. Moss holds moisture under the overlap and defeats the downhill-water-shedding mechanism.⁴¹
• Shingle granule loss and aging — asphalt shingles in coastal BC last 15–25 years under architectural grades; 12–18 years for 3-tab.⁴ Shade, moss, and inadequate ventilation all move this earlier.
• Deck rot from prolonged moisture — once the substrate rots, the roof cannot be re-shingled without deck replacement; a significantly higher repair cost.
• Ventilation failure → moisture accumulation — blocked soffits or missing ridge exhaust creates condensation on the underside of the decking; this is often mistaken for a roof leak but originates from inside.⁶

When to replace vs repair

What you see	Do this
Isolated missing or damaged shingles (< 10 shingles) on a young roof	Repair — like-for-like shingle replacement; straightforward
Flashing separated but metal still sound (no holes, no corrosion)	Repair — re-seat and reseal; inexpensive if caught early
Corroded or cracked flashing at chimney or skylight	Repair or replace flashing — a roofer, not a DIY sealant job
Moss present but shingles still lying flat	Treat — professional chemical treatment + debris removal; NOT replacement
Roof is 15–20+ years old, asphalt shingles, coastal location	Plan proactive replacement — within the next 1–3 years; don’t wait for interior damage
Active interior water staining with roof > 12–15 years old	Replace — repair cost compounds with roof age; get a full inspection and quote both options
Decking is soft, sagging, or rotting (confirmed in attic)	Replace — deck replacement is part of the scope regardless of shingle condition
Persistent leaks in multiple locations, multiple repairs	Replace — the roof is past its system life; patching is not cost-effective
Energy bills rising, attic is excessively hot/cold	Inspect ventilation first — often a ventilation fix, not a shingle issue

Verdict: roof replacement is irreversible (the old roof does not exist after tear-off) and clearly crosses the >$500threshold($10,000–$30,000+ for a typical Metro Vancouver detached home⁷⁸⁹). Both thresholds met → this decision earns full The Decision Lifecycle treatment. Get 2–3 written quotes; separate material and labour; confirm permit scope is included; decide on material class before contacting contractors so you’re comparing equivalent scope. → Roof-Replacement-Is-Irreversible-And-Five-Figure — Run-The-Decision-Lifecycle (Home Systems)

Typical cost (BC / Metro Vancouver)

Tier	What’s included	Range	Sources
DIY / parts only	Not applicable for full replacement — fall hazard; permit and workmanship standards require a roofer. Minor repairs (sealant, a handful of shingles) can be owner-done safely from ground-accessible eave edges only.	—	2 — indicative (limited sources)
Basic	Like-for-like asphalt shingle re-roof: tear-off, standard underlayment, 3-tab or entry-level architectural shingles, basic flashing, haul-away; does not confirm permit or ventilation upgrades included	$5–$9/ft² installed · typical 1,500 ft² roof: $7,500–$13,500	789
Standard	Full compliant re-roof: tear-off + deck inspection, synthetic underlayment, architectural shingles (25-yr class), complete flashing package (valleys, penetrations, drip edge, kick-outs), ridge vent, haul-away + permit; the default for any Metro Vancouver home	$9–$14/ft² installed · typical 1,500 ft² roof: $13,500–$21,000	8910
Premium / upgrade	Metal (steel standing seam or panel): 40–70 yr lifespan, no moss growth11 · Cedar shake or shingle: 25–50 yr, highest maintenance · SBS modified bitumen (low-slope): per project scope	Metal: $14–$24/ft² ($21,000–$36,000+) · Cedar: $14–$30/ft² ($21,000–$45,000+)	78119

Metro Vancouver labour runs 15–25% above the rest of BC.¹¹ The wide range within each tier reflects roof size, slope complexity, dormer count, access difficulty, and the extent of deck repair discovered during tear-off (budget $1,000–$4,000+ for decking surprises⁸). Additional line items often quoted separately:

• Chimney reflashing: $300–$1,000⁸
• Chimney repointing (mortar): $500–$2,000⁸
• Disposal/scaffolding on difficult sites: $500–$5,000⁸
• Permit: check with your municipality; commonly $150–$500 for a residential re-roof²

Get 2–3 written quotes before deciding. A quote far below Standard scope for what you believe is a full tear-off is a flag that permit, ventilation, or flashing work may not be included.

Basic tier: the $5–$9/ft² range represents entry-level quoting from multiple Metro Vancouver roofers; actual Standard-scope jobs typically land in the $9–$14 range. Use Basic tier numbers only to sanity-check a quote for partial/emergency repairs.

How to maintain it — the procedures

All on-roof work (walking the roof surface, installing or removing anything from the roof plane) is professional scope — fall hazard. Owner procedures are inspection from safe positions and keeping the surrounding systems (gutters, soffits, drip-edge, overhanging trees) clear.

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Procedure: Bi-annual ground-level inspection

Why: most roof deterioration is visible from the ground with binoculars before it causes interior damage. Spring (after winter storms) and fall (before rain season) are the two highest-leverage times.

You’ll need: binoculars, a phone camera with zoom for documentation, about 30 minutes.

1. Stand back far enough to see the full roof plane. Work in sections: front slope, back slope, and each side.
2. Scan for missing shingles, lifted or curled edges, patchy bare areas, or dark staining on the field.
3. Look at every valley (the V-shaped joints where two slopes meet) for bare metal, lifted edges, or debris dams.
4. Find every penetration — chimney, vents, skylights, pipe stacks — and look for rust staining, visible gaps, or missing sealant bead.
5. Check the eave line and drip edge: any sagging sections or missing metal edge?
6. Look for moss or algae: a fuzzy dark-green carpet anywhere on the shingles, especially on the shaded north-facing slope.
7. Photograph anything that looks unusual. Date the photos.

Done when: you have a full picture of all visible slopes; unusual findings are documented.

Stop and call a pro if:

• You see missing shingles, exposed decking, or separated flashing — these are active water-entry risks if it rains
• Moss is thick enough that shingle edges are visibly lifted
• Any penetration shows rust, gaps, or missing sealant
• You cannot see a portion of the roof safely from the ground (do not climb up to investigate)

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Procedure: Post-storm attic inspection

Why: the attic is where you will see a leak before you see a ceiling stain. Water travels 10–30 ft along rafters and sheathing before dripping through; finding it in the attic is the earliest detection available to an owner.⁵

You’ll need: a flashlight (phone is fine), 15 minutes.

1. Enter the attic access during daylight, or wait until dusk and look for any daylight penetrating the decking.
2. MUST move carefully — step only on structural members (joists), never on the insulation batts between them.
3. Scan the underside of the roof decking with the flashlight for dark staining, wet spots, or frost (in winter).
4. Run the light along rafters from ridge to wall plate looking for water trails — these will be darker than the surrounding wood.
5. Feel any suspicious dark area: soft wood means the moisture has been there long enough to begin decay.
6. Check insulation near the eave walls — if it is compressed and darker than surrounding batts, it has been wet.
7. Look at any penetrations from the underside: pipe boot flashing should have no daylight halo around it.

Done when: no wet spots, no dark staining on rafters or decking, no compressed or wet insulation.

Stop and call a pro if:

• Any wet spot in the attic — even small ones indicate a water path through the roof
• Soft, discoloured, or punky wood on rafters or decking
• Visible daylight through the decking
• Mold or heavy mildew smell in the attic space

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Procedure: Moss treatment — when moss is present

Why: moss holds moisture against the shingle and lifts edges over time, defeating the downhill-shedding mechanism. Treatment is far cheaper than re-roofing a system shortened by untreated moss. NEVER pressure-wash — this strips granules from asphalt shingles and voids the manufacturer warranty.¹

You’ll need: A garden sprayer and a moss-control product appropriate for the roof type (zinc sulfate or potassium soap-based products — read the label for dilution). A leaf blower for pre-treatment debris removal. This procedure covers treatment from ground-accessible eave edges only; anything requiring you to be on the roof slope belongs to a professional roof-cleaning service.

1. Clear loose debris from the eave area using a leaf blower directed down the slope. Do not scrape or brush aggressively — dislodge only loose material.
2. On a dry day with no rain forecast for 24 hours, apply the moss treatment solution using the sprayer with a gentle fan setting, working along the eave and low edge you can reach from a ladder at ground level. Follow product label dilution ratios.
3. Allow the product to dwell per manufacturer instructions (typically 20–30 minutes). Do NOT rinse — the product works slowly over subsequent rainfalls.
4. Leave the dead moss to weather off gradually over the following weeks. Do not scrub or pressure-wash it off.
5. For significant moss extending up the field of the roof beyond eave reach, call a professional roof-cleaning service that uses soft-washing (low-pressure, chemical treatment) — NOT a pressure-washer crew.

Done when: the accessible area has been treated; a roofer or roof-cleaning service is booked for upper sections.

Stop and call a pro if:

• Moss is on the upper two-thirds of the slope (you cannot safely reach it)
• Shingle edges are lifted — the moss may have already compromised shingle adhesion
• You are not confident in your ladder stability at the eave height

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Maintenance calendar:

• Spring (April–May): full ground-level inspection + attic check after winter rain season; clear any moss debris from eave zone; gutter inspection (tied to roof drainage — see gutters-drainage (Home Systems)).
• Fall (September–October): ground-level inspection before rain season; clear debris from valleys and eaves; book a roofer promptly if anything needs repair before winter.
• After any major windstorm: quick ground-level check for missing or lifted shingles.
• Every 1–3 years: if moss is present, professional soft-wash treatment or owner treatment of accessible sections.
• At 15 years (asphalt shingles): commission a professional roof inspection (roofer, not home inspector) to assess remaining life and flag any flashing or ventilation issues before they become interior damage.
• At 20 years (asphalt shingles) or sooner if any hard-fail sign appears: begin the replacement planning process — get 2–3 quotes, decide on material, line up a contractor.

Strata reality

This note is profiled for detached homes. For a detached owner, the roof is your asset and your responsibility — there is no strata corporation to call.

Detached-within-a-strata (bare-land strata or strata of detached homes). Some strata plans in Metro Vancouver cover detached houses on separate strata lots. In these cases, the roof may be common property (strata-maintained, funded by the depreciation report and contingency reserve) or limited common property / owner responsibility, depending on your registered strata plan and bylaws.¹² Action: read your strata plan and bylaws, and check the current depreciation report — the depreciation report must identify which common-property components are the owner’s vs the strata corporation’s responsibility.¹²

If your roof IS common property (strata corporation’s responsibility):

• You report deterioration, leaks, and failures to the strata manager in writing — do not arrange repairs yourself.
• The strata’s depreciation report should include a replacement reserve for the roof; check whether it is adequately funded.
• If the strata fails to act on a reported leak that damages your unit, document the failure in writing (SPA s. 72 — strata’s duty to maintain common property) before pursuing any claim.
• A leak from common property that damages your strata lot may engage the strata’s building insurance; confirm the deductible and any s.158¹³ chargeback risk with your broker.

If your roof is YOUR responsibility within a strata:

• All of the detached-home guidance above applies.
• You still need strata council approval (Standard Bylaw 8 or equivalent) before starting a full replacement, as it affects common property or limited common property boundaries in most cases.

SPA references:

• SPA s. 72 — strata corporation’s duty to repair and maintain common property
• Standard Bylaw 2 — owner’s duty to maintain their strata lot
• Standard Bylaw 8 — owner must obtain strata council approval for alterations
• SPA s. 96–103 — depreciation report requirements (roof is a typical Schedule-B capital item)

When you hire someone

Ask:

• Are you a member of the Roofing Contractors Association of BC (RCABC)? (Members employ Red Seal journeypersons and carry $10M liability — the verifiable quality standard in BC roofing.³)
• What liability insurance do you carry, and will you provide a current certificate before work starts?
• Are you registered with WorkSafeBC, and will you provide a current Clearance Letter?
• Will you pull the building permit and schedule the municipal inspection, or is that my responsibility?
• Is tear-off and disposal of the old material included in the quote?
• What underlayment are you using, and is it the full synthetic or just felt?
• How is flashing handled — is the full flashing package (valleys, penetrations, drip edge, kick-outs) included, or quoted separately?
• What ridge ventilation is being installed?
• What is the workmanship warranty, and who backs it (you or the manufacturer)?
• What happens if you discover rotted decking during tear-off? How is that priced?

Verify the work:

• Municipal building permit number issued before work starts (request a copy)
• Inspection passed — confirm the municipal inspector signed off, not just that the permit was issued
• Full flashing package installed at all penetrations and valleys — look from the ground at every chimney, skylight, vent, and valley after the job
• Ice-and-water shield present at eaves and valleys (ask the contractor to show you a photo from during installation if you cannot view it in progress)
• Ridge vent continuous along the ridge line
• Drip edge and kick-outs installed at eave and rake edges
• No exposed fasteners on the field of the roof
• Gutters re-attached and slope maintained after the new drip edge is installed
• Old material removed and site cleaned — no roofing nails in the garden

Who to call

• Roofer (RCABC-member preferred) → vendor-roster (Home Systems). Fill: company name, RCABC member status (verify at rcabc.org), phone, WorkSafeBC clearance on file, notes on response time for emergency tarping.
• Insurer / broker → insurance-warranties (Home Systems). Fill: policy #, confirmation that your policy covers water damage from a roof leak, and — for detached-within-strata owners — whether a strata s.158 deductible chargeback is covered.
• Strata manager (if applicable) → Strata MOC. Fill: after-hours emergency contact, strata plan # confirming roof responsibility split, current depreciation report date.

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Sources

Idea Compass

North: Where this comes from

• Exterior (Home Systems) — parent system
• Flashing-Fails-Before-The-Field-Does — The Primary Roof Water-Ingress Mechanism (Home Systems) — the mechanism that defines what to inspect
• The Decision Lifecycle — the replacement decision framework

East: Tensions / failure

• Moss-Lifts-Shingles-And-Must-Never-Be-Pressure-Washed (Home Systems) — the coastal BC accelerant and its owner-inflicted failure mode
• Roof-Replacement-Is-Irreversible-And-Five-Figure — Run-The-Decision-Lifecycle (Home Systems) — the irreversible decision that demands full process
• Attic-Ventilation-Is-A-Roof-Lifespan-Multiplier-In-Coastal-BC (Home Systems) — the hidden failure mode from below

South: Where this leads

• ceilings (Home Systems) — what a roof leak destroys below
• attic (Home Systems) — first detection point for any roof leak
• gutters-drainage (Home Systems) — the drainage system the roof depends on
• soffits-eaves-fascia (Home Systems) — the ventilation intake the roof system depends on
• finance-replacement-reserves (Home Systems) — the financial planning for a five-figure replacement
• vendor-roster (Home Systems) — the roofer named-resource card

West: What’s similar

• siding (Home Systems) — sibling envelope component; same water-ingress priority
• grading (Home Systems) — sibling exterior component; both route water away from the structure
• water-heater (Home Systems) — same decision pattern: aging component, irreversible replacement, five-figure cost, proactive planning beats emergency replacement

Footnotes

1. Asphalt Roofing Manufacturers Association (ARMA) — algae and moss prevention and cleaning for asphalt roofing; explicit statement: “Never use a pressure washer to clean an asphalt shingle roof as this will cause granule loss and very likely premature failure of the roof system”; recommended cleaning method: 50:50 bleach-water solution, low-pressure rinse; warns against zinc/copper strip installation on existing roofs due to exposed-nail leak risk — https://www.asphaltroofing.org/algae-moss-prevention-cleaning-asphalt-roofing-systems/ ↩ ↩² ↩³

2. Taves Roofing, Metro Vancouver roofing contractor — when roofing permits are required in Metro Vancouver; full replacement and structural deck work require a building permit; minor repairs (limited shingles, small leak, flashing re-seal) generally do not; homeowner bears responsibility if permit is skipped even when contractor advises otherwise — https://tavesroofing.com/roofing-permits/roofing-permits-metro-vancouver/ ↩ ↩² ↩³

3. Roofing Contractors Association of BC (RCABC) — member requirements include employing Red Seal or TQ journeypersons, $10Mliabilityinsurance,$250,000 surety bond, current health and safety certification; members are the only contractors eligible for the RoofStar Guarantee on labour and materials — https://www.rcabc.org/members/become-a-member/ ↩ ↩²

4. Paragon Roofing BC, Metro Vancouver roofing contractor — how long asphalt shingles last in Vancouver; architectural shingles 15–25 years; 3-tab 12–18 years; ventilation adds 3–7 years; maintenance adds 2–4 years; moss and shade the primary coastal accelerants — https://www.paragonroofingbc.ca/blog/how-long-do-asphalt-shingle-roofs-last-in-vancouver-and-why ↩ ↩² ↩³ ↩⁴

5. Paragon Roofing BC, Metro Vancouver roofing contractor — roof leak detection guide for BC homeowners; flashing accounts for an estimated 85% of roof leaks; water travels 10–30 ft along rafters before appearing as a ceiling stain; systematic attic-first inspection process — https://www.paragonroofingbc.ca/blog/roof-leak-detection-guide-for-bc-homeowners ↩ ↩² ↩³ ↩⁴

6. Paragon Roofing BC / BC Building Code (NBC adopted by BC) — attic insulation and ventilation for Vancouver homes; BC code requires approximately 1/300 of insulated ceiling area as net free ventilation area; continuous soffit intake and ridge exhaust; baffles maintaining ≥ 63 mm clear airway; poor ventilation shortens shingle life and feeds mould on sheathing — https://www.paragonroofingbc.ca/blog/attic-insulation-ventilation-in-vancouver-r-values-moisture-mould ↩ ↩²

7. Paragon Roofing BC, Metro Vancouver roofing contractor — no-nonsense guide to roof replacement cost in Vancouver; supports $5–$9/ft² range for basic/entry-level asphalt shingle scope; complete material-and-labour cost breakdown by home size — https://www.paragonroofingbc.ca/blog/roof-replacement-cost-in-vancouver-a-no-nonsense-guide-to-costs-quality-and-confidence ↩ ↩² ↩³

8. Vancouver General Contractors — 2026 Metro Vancouver roofing cost guide; cost by home size (1,500 ft² $7,000–$12,000; 2,500 ft² $10,000–$18,000; 3,500 ft² $15,000–$30,000+); additional cost line items (decking $1,000–$4,000, chimney flashing $300–$1,000, disposal $500–$3,000, scaffolding $1,000–$5,000) — https://vancouvergeneralcontractors.com/roof-replacement-cost-vancouver-2026/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

9. AUK Roofers — average roof replacement cost Canada 2026; Metro Vancouver asphalt shingle $9,500–$18,000 for typical detached; metal $20,000–$36,000; Vancouver trends 10–25% above Canadian average; standard quote should include tear-off, deck inspection, underlayment, ice-and-water shield, drip edge, labour, permit, inspection, and workmanship warranty — https://aukroofers.com/average-roof-replacement-cost-canada ↩ ↩² ↩³ ↩⁴

10. Paragon Roofing BC, Metro Vancouver roofing contractor — 2025 real cost guide for roof replacement in Vancouver; explicitly states “Asphalt architectural shingles (full tear-off, standard details): $9–$14/ft² all-in on many homes” for full standard-scope work — https://www.paragonroofingbc.ca/blog/how-much-does-a-roof-replacement-cost-in-vancouver-really-2025 ↩

11. Green Building Canada — average roof replacement cost in BC by material; metal is non-porous (no moss growth); metal 40–70 yr lifespan vs asphalt 15–30 yr; Metro Vancouver labour 15–20% above rest of BC — https://greenbuildingcanada.ca/average-roof-replacement-cost-bc/ ↩ ↩² ↩³

12. Province of BC, BC government — strata depreciation report requirements; depreciation report must identify common property and limited common property that strata lot owners are responsible to maintain; roof responsibility depends on registered strata plan and bylaws — https://www2.gov.bc.ca/gov/content/housing-tenancy/strata-housing/operating-a-strata/repairs-and-maintenance/depreciation-reports/depreciation-report-requirements ↩ ↩²

13. Strata Property Act (BC Laws) — the governing statute (incl. ss. 135, 158, 164) — https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/98043_09 ↩