Exterior — System Brief
The Exterior system is the home’s weather envelope and outdoor-use surfaces: roof, gutters, siding, soffits/fascia, grading, deck, fence, driveway/walkway, and exterior paint. The one thing to get right across the whole system: keep water moving away from the building at every level — from the roof peak to the soil at the footing — because every expensive failure here (rot, foundation wetting, structural damage) traces to water that stopped moving and stayed. Nine components, all interconnected; failures cascade down the chain.
The rules that matter most (system-wide tripwires)
These are the highest-stakes signals across all nine components. Each one is cheap to catch early and expensive to find late.
- Ceiling stains, wet attic insulation, or daylight through roof decking → treat as an active leak, call a roofer within days. Every day of delay expands scope and cost. → roof (Home Systems)
- Roof is 15–20+ years old (asphalt shingles) → shift to proactive replacement planning. Coastal BC’s moss and shade move this earlier than manufacturer warranties suggest. → roof (Home Systems)
- Moss thick enough to lift shingle edges → professional soft-wash treatment, never a pressure washer. Pressure washing voids the warranty and strips granules — the most common owner-inflicted damage in Metro Vancouver. → roof (Home Systems)
- Gutter overflow running down the wall or pooling at the foundation → clean or repair today. This is the direct sequence to fascia rot, foundation wetting, and basement water. → gutters-drainage (Home Systems)
- Downspout terminates at the foundation wall → extend it to ≥ 1.8 m from the building. A gutter that drains perfectly is useless if the downspout re-delivers water to the footing. → gutters-drainage (Home Systems)
- Dark staining, bubbling paint, soft or spongy siding, or cracks > 1.5 mm at window/door frames → water intrusion until proven otherwise. These precede 60,000+ wall-rot remediation. → siding (Home Systems)
- Any stucco crack at a penetration corner on a 1982–1998 Lower Mainland home → call a building envelope professional before doing anything else. This is BC’s leaky-condo legacy failure mode; it looks like a surface crack and hides structural rot. → siding (Home Systems)
- Soffit or fascia feels soft or spongy under pressure → rot extends further than what’s visible. The only question is scope. → soffits-eaves-fascia (Home Systems)
- Soffit vents are painted over or packed with insulation → clear them this season. Blocked vents kill attic ventilation, accelerating shingle failure and attic mold. → soffits-eaves-fascia (Home Systems)
- Water pools against the foundation after rain → check grading first. Re-grading is the cheapest fix (500 DIY) and the #1 outdoor cause of wet basements. Address it before spending on interior drainage. → grading (Home Systems)
- Deck wobbles, a post feels spongy, or any wood near the ledger board is soft → stop loading the deck and call a contractor. Ledger rot is the primary cause of catastrophic deck collapse; fasteners lose grip in soft wood. → deck-patio (Home Systems)
- Deck is over living space with no waterproof membrane below the decking → any rain is damaging your structure now. → deck-patio (Home Systems)
- A fence post rocks or leans > 10° → replace that post before the panels load it further. One failed post collapses two panels; catching it early costs 500 vs a cascading replacement. → fence (Home Systems)
- Driveway slopes toward the garage → correct the drainage direction. This drives water against the garage slab and foundation with every rain. → driveway-walkway (Home Systems)
- Walkway has a vertical lip ≥ 1.3 cm from frost heave → address it now. BC property owners are liable for reasonably safe walkways; this is legally exposed ground. → driveway-walkway (Home Systems)
- Peeling, cracking, chalking, bare wood, or mildew on exterior paint → repaint before the next rainy season. The paint film is what stands between coastal rain and the wood substrate; rot repair costs orders of magnitude more than a repaint. → exterior-paint (Home Systems)
- Pre-1978 home exterior → assume lead paint. No dry-sanding, power-sanding, or heat-gun stripping without a test and lead-safe practices. → exterior-paint (Home Systems)
Component-by-component
| Component | The one thing to watch | Owner vs Pro |
|---|---|---|
| roof (Home Systems) | Flashing — accounts for ~85% of roof leaks; inspect every penetration and valley twice a year. Moss is the coastal accelerant. | All on-roof work = pro. Inspection from ground and attic is owner scope. |
| gutters-drainage (Home Systems) | Clean twice a year minimum (late fall + spring); always flush the downspouts, not just the trough. On 2-storey or higher, the 200 pro premium is not worth the fall risk. | DIY on single-storey only. Two-storey+ → pro. |
| siding (Home Systems) | Caulk at every penetration is the last defence. Re-caulk failed joints annually; full caulk replacement every 3–5 years regardless of appearance. 1982–1998 stucco homes need a building envelope assessment before any work. | Caulk touch-up + soft-wash = owner. Re-cladding = always pro, permit required. |
| soffits-eaves-fascia (Home Systems) | Two separate failure modes: blocked soffit vents (attic degradation, invisible) and fascia rot from gutter overflow (visible eventually, structural). Fix gutters first to stop the rot source. | Inspection and vent-clearing at ladder height = owner. Replacement at roofline height = pro. |
| grading (Home Systems) | Backfill settles slowly over years; a correct grade at move-in can flip to negative without you noticing. Annual perimeter walk with a level catches it. Keep 15 cm clear gap between soil and siding. | Minor re-grade with topsoil on one side = DIY. Multi-side or equipment needed = landscaper. |
| deck-patio (Home Systems) | The ledger board and post bases. Probe all wood within 600 mm of grade and at the ledger every spring. Composite boards don’t rot; the substructure under them still can. | Annual inspection = owner. Structural repair, ledger replacement, new guard systems = licensed contractor + permit. |
| fence (Home Systems) | Post-ground interface. Stain or seal wood fencing every 2–3 years. Confirm property line with a BC Land Surveyor before any line-fence work — building on or over the line without agreement can force removal. | Post inspection and staining = owner. Post replacement with concrete footing = capable DIY or pro. |
| driveway-walkway (Home Systems) | Drainage direction and surface maintenance cadence. Sealcoat asphalt within 12 months of installation and every 3 years after — this alone halves or doubles driveway life. Concrete spalling in Vancouver’s climate is typically not patch-repairable; once it starts, plan replacement. | Crack fill, sealcoating, paver joint sand = DIY. Resurfacing, base work, curb-cut permits = pro. |
| exterior-paint (Home Systems) | Prep is 80% of durability. Power-wash, dry fully, scrape, caulk, spot-prime — in that order — before any topcoat. Skipping prep is why repaints fail at 3 years instead of 8. North and west faces fail first in coastal BC. | Small spot-paint on a ladder = capable owner. Full house on ladders or scaffolding = pro. |
Recurring upkeep at a glance
Cross-linked to Maintenance Calendar (Home Systems).
Spring (March–May):
- Ground-level roof inspection (binoculars) + attic check after winter rain season
- Gutter clean #1 (spring debris and pine needles) + downspout flush
- Inspect soffit vents — clear any painted-over or packed perforations
- Siding inspection — all four walls; check caulk at all penetrations
- Grading perimeter walk — confirm positive slope at all sides
- Deck annual inspection: wobble test, poke test at ledger and post bases
- Fence post push-test; check gate hardware
- Driveway/walkway drainage walk after a rain — note pooling
Fall (September–November):
- Roof inspection before rain season; book a roofer promptly if anything needs repair
- Gutter clean #2 (late October–November, after leaf drop)
- Siding caulk touch-up for anything flagged in spring; clear organic debris from siding
- Exterior paint check — note any failing sections before wet season
Recurring but not annual:
- Gutters every 3 years: pro cleaning with hanger and fascia inspection
- Siding caulk: full replacement every 3–5 years regardless of appearance
- Asphalt sealcoating: every 3 years
- Paver joint sand: top up every 2–3 years
- Wood fencing stain/seal: every 2–3 years
- Exterior paint repaint cadence: wood siding 5–8 yr; stucco 7–10 yr; fibre cement 10–12 yr
- Roof at 15 years: professional roof inspection (roofer, not home inspector)
- Moss treatment (if present): professional soft-wash every 1–3 years
- Deck wood surface clean and reseal: every 1–2 years (PT wood) or 2–3 years (cedar)
Biggest-cost / irreversible decisions
These cross the >$500 and/or irreversible thresholds; all earn The Decision Lifecycle treatment. All feed into finance-replacement-reserves (Home Systems).
| Decision | Cost range (Metro Van) | Notes |
|---|---|---|
| Roof replacement | 45,000+ (Standard–Premium) | Irreversible (old roof is gone); get 2–3 written quotes; separate material and permit scope; confirm flashing package and ventilation included. → Roof-Replacement-Is-Irreversible-And-Five-Figure — Run-The-Decision-Lifecycle (Home Systems) |
| Full siding re-clad | 80,000+ | Irreversible; requires permit + rain-screen cavity ≥ 9.5 mm per BC Building Code s.9.27; building envelope assessment first for any 1982–1998 stucco home. → BC Siding Material Decision — Fibre Cement vs Vinyl for Detached Homes (Home Systems) |
| Full deck replacement | 75,000+ | Irreversible; permit required for raised attached decks >600 mm above grade; structural safety (ledger rot) adds time-urgency to the decision. → Ledger-Board-Is-the-Structural-Linchpin-of-an-Attached-Deck (Home Systems) |
| Full soffit/fascia replacement | 10,000+ | Reversible (can re-replace); material choice (wood vs aluminum/vinyl) is the decision with decade-long consequences. → Aluminum or Vinyl Outlasts Wood Soffit-Fascia in Metro Vancouver’s Wet Climate (Home Systems) |
| Full gutter replacement | 8,000 | Reversible; get 2–3 quotes; watch for fascia rot discovered during install (adds cost). |
| Perimeter drain + re-grading | 20,000+ | Excavation = irreversible; full Decision Lifecycle warranted before committing. |
| Full driveway replacement | 30,000+ | Reversible; asphalt vs concrete vs pavers is a total-cost-of-ownership decision; concrete spalling = replacement, not repair. |
| Full fence replacement | 15,000+ | Reversible; property line confirmation before work; neighbour consent for line fences. |
Strata vs detached
Detached homes: all nine components are owner responsibility. This entire brief applies.
Strata / condo / townhouse: most of the Exterior system is common property — the strata corporation maintains and funds it. Owner scope is limited:
- roof (Home Systems) → common property; report deterioration and leaks in writing to the strata manager.
- gutters-drainage (Home Systems) → common property in conventional strata; bare-land strata may vary.
- siding (Home Systems) → common property; DO NOT caulk, drill, or patch without written strata council approval (Standard Bylaw 8). Envelope remediation is a major special levy risk in pre-2000 buildings.
- soffits-eaves-fascia (Home Systems) → common property.
- grading (Home Systems) → the ground around foundations is common property; report drainage problems to the strata manager.
- deck-patio (Home Systems) → typically limited common property (exclusive use, your enjoyment, but strata may hold maintenance obligations depending on bylaws). Confirm in writing: surface maintenance is usually owner; structural is usually strata. → Deck-Strata-Reality-Limited-Common-Property-and-Owner-Responsibility (Home Systems)
- fence (Home Systems) → common property; strata maintains it.
- driveway-walkway (Home Systems) → common property.
- exterior-paint (Home Systems) → common property; strata schedules and funds exterior repainting; Heritage Alteration Permits (where applicable) are strata’s responsibility.
Strata keyword: SPA s. 72 (strata corporation’s duty to maintain common property). If the strata fails to act on a reported defect that damages your unit, document the failure in writing before pursuing any claim. SPA s. 158: if owner-side neglect causes damage to common property or other units, the strata can charge back its insurance deductible.
What this brief is NOT
This is a one-screen rollup synthesized from nine component notes — not a substitute for them. Each component note contains the full mechanism, warning-sign table, step-by-step procedures, triangulated pricing with sources, hiring questions, and verification checklists. When something goes wrong or you’re making a decision, open the component note.
Start here for orientation. Go deeper in Exterior (Home Systems) (the system MOC) and Home Systems KB MOC (the full KB).