Seeing ants in your kitchen and not sure if they’re carpenter ants or pavement ants? Correct ID changes everything — from bait choice to sealing and follow-up. Use this quick guide to compare species, map entry points, and choose DIY vs. professional ant control in Metro Vancouver.
Why ID Matters: Carpenter vs Pavement Ants
- Damage vs nuisance: carpenter ants excavate wood for nests; pavement ants nest under slabs, pavers, and foundations.
- Body clues: carpenter ants are larger (6–13 mm), rounded thorax, single node; pavement ants are smaller (2.5–4 mm) with parallel ridges on the head and two nodes.
- Signs: carpenter ant frass (sawdust with insect parts) vs. pavement ant sand mounds pushing up between cracks.
- Seasonal swarms: winged swarmers inside points to a nest nearby; ID wings/size to pick the right plan.
Pre-Inspection Checklist (10–20 minutes)
- Follow trails from kitchens/baths to find entries at baseboards, utility lines, and sliding doors.
- Check for frass piles under window trim or ceiling edges (carpenter ants).
- Look for soil mounds between slabs, driveway cracks, and along foundations (pavement ants).
- Trim vegetation touching siding; move firewood and recycling off walls.
- Set a few sticky monitors in kitchens and basements to map hot spots.
Same-Day Actions (Safe & Effective)
- Wipe trails with soapy water and reduce moisture; keep food sealed and counters crumb-free.
- Use targeted baits along trails — protein/sugar rotation works for pavement ants; sweet baits and exterior perimeter treatments help with carpenter ants.
- Do not spray over bait trails; repellent sprays can scatter colonies and slow results.
- For carpenter ant frass or night noises, plan a professional inspection to locate satellite nests in wood.
Entry Points to Seal First
- Door bottoms & thresholds (install sweeps) and weather-strip around jambs.
- Utility penetrations (cable, gas, AC lines, hose bibs) with exterior-grade sealant.
- Foundation cracks & slab joints — common for pavement ants.
- Siding & window trim gaps; wood-to-soil contact that invites carpenter ants.
Carpenter vs Pavement Ants: Cheat-Sheet
| Sign | Likely Areas | Fast Win |
|---|---|---|
| Frass (sawdust + insect bits) — carpenter | Under window sills, ceiling edges, wall voids near warm appliances | Moisture control, seal gaps, exterior perimeter + sweet bait; schedule inspection |
| Sand mounds between pavers — pavement | Driveways, patio cracks, along foundation | Place protein/sugar baits along trails; treat slab edges; seal joints |
| Large black/bicolour ants (6–13 mm) | Night foraging on siding/trees; kitchens at night | Track to entry; treat exterior trails; avoid spraying over bait |
| Small brown ants (2.5–4 mm) in lines | Kitchens, baseboards, recycling areas | Rotate baits; wipe trails; keep food sealed |
DIY vs Professional Treatment
DIY works for light pavement ant activity with sanitation, bait rotation, and sealing slab joints. Carpenter ants near frass or night noises often indicate nested galleries — get a pro to locate and treat hidden sites.
Professional service is best for repeat trails after rain, swarmers indoors, or activity that rebounds every few weeks.
When to Call Primary Pest Control
- You’ve found carpenter ant frass or hear wall/ceiling activity at night.
- Trails persist 24–48 hours after DIY baiting/sanitation.
- You want moisture-based inspection, targeted exterior perimeter treatment, and entry-point hardening.
Carpenter & Pavement Ant Treatment • (604) 716-6027
Service Area
Vancouver • Burnaby • Richmond • Surrey • New Westminster • Coquitlam • Port Coquitlam • Port Moody • North Vancouver • West Vancouver • Langley • Delta • Maple Ridge
FAQs
How do I tell carpenter ants from pavement ants fast?
Size and signs: carpenter ants are much larger and leave frass; pavement ants are small and push sand mounds from cracks.
Should I bait or spray?
Bait first. Spraying over trails can repel and split colonies. Use sweet/protein baits for pavement ants; sweet baits + exterior perimeter treatments for carpenter ants.
How long until activity drops?
Light trails typically fade within 24–72 hours after sanitation, sealing, and correct baiting. Carpenter ant issues tied to moisture may need a professional program.