Carpenter Ants: What Damage Do They Cause to Your Home?

Carpenter Ants: A Silent Structural Threat

Carpenter ants (Camponotus spp.) are among the most destructive insects for Quebec homes. Unlike termites, they don't eat wood -- they excavate it to build nests, creating gallery networks that progressively weaken your home's structure.

How Carpenter Ants Damage Your Home

Carpenter ants primarily attack moist or decaying wood but can also excavate sound wood. Workers create smooth galleries, expel sawdust ("frass"), and the colony expands through satellite nests. Vulnerable areas include window frames, door sills, floor joists, and deck structures.

Telltale Signs of Their Presence

• Fine sawdust: small piles of light-brown sawdust mixed with insect fragments
• Wall sounds: rustling or crackling from walls at night
• Winged ants: winged ants indoors in spring indicate a mature nearby nest
• Large ants: carpenter ants are 6-25 mm, much larger than common ants
• Hollow wood: tapping on beams produces a hollow sound

Potential Damage Scale

A mature colony can number up to 50,000 individuals and operate for years undetected, causing structural weakening, floor sagging, water infiltration, and cosmetic damage.

Repair Costs

• Window frame replacement: $500-$2,000 per window
• Joist/beam repair: $2,000-$8,000
• Exterior siding replacement: $3,000-$15,000
• Major structural repair: $10,000-$30,000+

Professional extermination typically costs $300-$800. Early intervention is far more economical.

Why Montreal Homes Are Especially Vulnerable

Montreal's harsh winters drive ants indoors. Freeze-thaw cycles create moisture problems. Mature city trees serve as primary nests. Older wooden structures and popular wooden decks provide ideal conditions.

Prevention Tips

• Eliminate wood-to-soil contact around your home
• Keep firewood 6+ meters from the house, elevated
• Trim branches touching your roof
• Fix water leaks and ensure ventilation in damp spaces
• Replace water-damaged wood promptly

Professional Treatment

DIY solutions rarely reach the main nest. 514 Extermination locates the main and satellite nests, applies targeted treatments, and provides perimeter prevention. Visit our ant extermination service to protect your real estate investment.