Pest Control — System Brief

Pest control in a Metro Vancouver home is a moisture and entry-point problem first, and a treatment problem second. The organisms change — carpenter ants, rodents, wasps, silverfish — but the root cause is almost always the same: damp wood, an accessible food source, or a gap in the building envelope. The one thing to get right across the whole system: fix the condition (moisture, entry point, food) before treating; chemical or physical control that doesn’t address the underlying condition will recur within a season.

The rules that matter most (system-wide tripwires)

• If you see frass, mud tubes, hollow-sounding wood, or winged swarmers indoors → call a licensed structural pest control company immediately. WDO signs are never cosmetic — an active colony has been excavating framing, and there is also a moisture source to find and fix. → pest-termites-wdo (Home Systems)

• If you hear scratching in walls at night, find droppings, or smell a musky odour → start exclusion and snap trapping now. Rodents breed fast; the longer they are inside, the more wiring they may chew. → pest-rodents (Home Systems)

• If a circuit breaker trips repeatedly with no obvious cause, or lights flicker → treat this as a possible rodent-wiring-damage sign. Get an electrician involved alongside the pest company. → pest-rodents (Home Systems), wiring-circuits (Home Systems)

• If you find droppings in a sealed space (attic, crawlspace, cabin) → do not dry-sweep. Wet the area with bleach solution (1:10) first — deer mouse droppings can carry hantavirus. → pest-rodents (Home Systems)

• If a wasp nest is larger than a tennis ball, in a wall void, eaves, soffit, or underground, or requires a ladder → it is a professional job. DIY on an established nest triggers defensive stinging and rarely eliminates the colony. → pest-insects (Home Systems)

• If you see large black ants (≥6 mm) with frass at the trail entry, or the trail disappears into framing → call a pro. Carpenter ants foraging from the garden are DIY territory; carpenter ants in structural wood are not. → pest-insects (Home Systems)

• If a gap anywhere on the building envelope is larger than 6 mm → it is a rodent entry point. Seal it before pest season, not after. → pest-prevention (Home Systems)

• If wood, mulch, or dense shrubs touch the building → that contact is a carpenter-ant and rodent bridge. Pull them back before anything else. → pest-prevention (Home Systems)

Component-by-component

Component	The one thing to watch	Owner vs pro
pest-termites-wdo (Home Systems)	Frass + hollow wood = active colony. In Metro Vancouver the threat is carpenter ants, not drywood termites — both follow moisture into softened wood. Annual spring WDO walk-through is the minimum; licensed structural pest control (BC IPM certificate) for any active colony or structural concern.	Pro for treatment and structural damage assessment; owner for annual spring inspection walk-through and moisture control
pest-rodents (Home Systems)	Exclusion is the only permanent solution. Snap traps remove current residents; if the entry gap stays open, new rodents replace them within weeks. Wiring-gnaw hazard makes any flickering/breaker-trip an electrician call, not just a pest call. BC banned second-generation anticoagulant rodenticides (SGARs) effective Jan 2023 — snap traps are the preferred residential method.	DIY for light, accessible infestations (exclusion + snap traps <$100); pro for wall/roofline/crawlspace nesting, strata spread, or suspected wiring damage
pest-insects (Home Systems)	Moisture and food attract insects; entry points let them in. Carpenter ants need damp wood (≥15% moisture); silverfish need >75% RH; pantry moths hitch in with purchased dry goods; wasps are a seasonal building-envelope problem. Fix the condition and most nuisance insects resolve without chemicals.	DIY for pantry moths, fruit flies, silverfish (humidity fix), small early-season wasp nests; pro for carpenter ants in framing, in-wall/underground wasp nests, cockroaches in strata
pest-prevention (Home Systems)	Two annual gates: spring (March–April) and fall (September–October). Spring seals gaps before ant and wasp season; fall seals gaps before rodents move indoors. Prevention ($50–$150 in materials) costs far less than any treatment ($300–$1,500+). Four pillars: exclusion, moisture control, food/waste management, vegetation discipline — all four are required; patching one while skipping another resets the treadmill.	DIY for all four prevention pillars; professional for annual prevention contracts ($300–$600/year) or exclusion packages ($435+) if ongoing pressure from a wooded or high-density urban environment

Recurring upkeep at a glance

Link to Maintenance Calendar (Home Systems) for the full scheduling home. The pest-control rhythm:

• March–April (spring gate): full entry-point audit and sealing; door sweeps and vent screens checked; eave and soffit inspection for early wasp nests and carpenter ant trails; crawl space and attic WDO walk-through; prune any vegetation that grew back into contact with the building over winter.
• April–June: carpenter ant and wasp season peaks — treat early. A wasp nest in April (golf-ball size) is DIY; the same nest in August is a pro call.
• September–October (fall gate): re-seal any gaps opened over summer; move or elevate firewood; re-inspect door sweeps; second perimeter check before rodents migrate indoors.
• Year-round (quarterly): food storage and moisture check — under-sink drips, pet food, compost lids, pantry dry goods in sealed hard containers.
• After any renovation or trade work: re-inspect and re-seal every penetration the trade opened before the drywall goes back.
• On home purchase: commission a full WDO inspection before possession — one of the most under-asked-for inspections in BC real estate.

Biggest-cost / irreversible decisions

These are the decisions this system surfaces that hit insurance-warranties (Home Systems) or finance-replacement-reserves (Home Systems) and warrant the full The Decision Lifecycle treatment:

• Structural framing repair after WDO infestation — irreversible + commonly >$500,often$1,500–$10,000+. Do not commit to repair scope until the pest company has confirmed the colony is under control AND a contractor (or structural engineer for load-bearing elements) has independently scoped the damage. The two are parallel, not sequential.
• Major exclusion project (roofline, crawlspace, sill plates) — if the quote approaches $1,500+, treat as a formal decision with 2–3 competing written quotes.
• Recurring annual pest control contracts — reversible (you can cancel), typically $300–$600/year; no full Decision Lifecycle needed, but compare a single-season quote to a contract price before committing.
• Carpenter ant treatment when structural damage is found — a one-time treatment ($450–$800) can escalate sharply into a remediation project ($3,000+). Get the licensed pest company’s written report on colony extent and damage, then a separate contractor quote on repair scope, before authorising work.

WDO and rodent damage: insurance usually excludes both. Most standard policies exclude “insect damage” and “vermin damage.” Confirm in writing with your broker what your policy actually covers — the standard policy exclusion makes the prevention and early-detection investment even higher-leverage.

Strata vs detached

Governing principle: pest responsibility follows the access point, not where the pest is found.

Question	Strata	Detached
Building envelope exclusion (foundation, exterior walls, vents, soffits, roofline)	Strata corporation — SPA s. 72 common-property maintenance duty	Owner
WDO in structural framing or building envelope	Strata corporation — structural framing is common property	Owner
In-unit pest (silverfish from your bathroom humidity, pantry moths from your kitchen)	Owner — unit-level condition	Owner
Wasp nest on common-property eave or soffit	Strata corporation	Owner
Wasp nest on your private balcony	Owner (subject to bylaws)	Owner
Rodent entering through shared voids, foundation, or building envelope	Strata corporation — entry is almost always through common property	Owner
Multi-unit spread (cockroaches, bed bugs, or rodent colony in shared voids)	Strata corporation — building-wide coordination required; unit-by-unit is not effective	N/A (single structure)
In-unit food, waste, and sanitation (attractants within your unit)	Owner	Owner

Strata procedural defence: document in writing (email to strata manager with photos, date, and evidence) before acting on any pest issue that could involve common property. SPA s. 164 allows owners to apply to the Civil Resolution Tribunal if the strata corporation fails its maintenance duty. Do not seal common-property gaps yourself without strata approval.

BC IPM Regulation: licensed pest control operators must give 72-hour notice before applying pesticides in occupied living accommodations; this applies to strata-commissioned pest control — confirm notice procedures with your strata manager before work starts.

What this brief is NOT

This is a rollup, not a substitute for the component notes. Each component note carries the full mechanism, failure-mode discrimination tables, SOPs with step-by-step procedures, triangulated pricing tiers, sourced claims, strata-specific bylaws (SPA provisions cited), and hiring/verification checklists.

For the full picture on any component, open the note directly. For the system index and the atomic Q-I-ST notes this system generated, see Pest Control (Home Systems). For the whole KB, see Home Systems KB MOC.