Pavement Ant — Identification & Control

• Size & color — 2.5-3 mm, dark brown to nearly black.
• Body — two-node waist (distinguishes from odorous house ants and Argentine ants, which have one node).
• Location — the strongest field ID. Pavement ants live in and around sidewalks, driveways, patio expansion joints, and slab foundations.
• Small soil piles along sidewalk cracks and driveway joints — the excavation from their nest.
• Aggressive intraspecific fights visible on pavement — hundreds of dead ants on a driveway after a colony boundary skirmish.

Pavement ant colonies contain 3,000 to 30,000 workers with a single queen. They nest under and along concrete slabs, sidewalks, driveways, patios, and stone landscape features — anywhere warm sun-heated surface meets soil. Colonies are strongly territorial with neighboring pavement ant colonies, which is why the mass battles are so common in spring and fall when colonies reassert territory.

Because pavement ants nest so consistently under hardscape, treatment approach is different from soil-nesting or wall-void ants. Broadcast baits and perimeter residuals along the concrete edges reach where they live.

Pavement ants enter homes primarily during two periods: early spring when workers first re-emerge and seek food, and mid-summer during hot dry stretches when they seek moisture. Common entry paths:

• Along the concrete-to-siding joint where garages or foundations meet slabs.
• Through cracks in slab foundations from below.
• Through weep holes in brick veneer.
• Under exterior doors, especially garage service doors.
• Along utility line penetrations at grade level.

Indoors, they typically trail across kitchen floors, along baseboards, and to pet food or spill residue.

• Perimeter treatments along concrete edges — sidewalks, driveway, patio, foundation slab.
• Granular baits broadcast along outdoor trails and around slab edges — workers carry the active back to the colony under the concrete.
• Interior crack-and-crevice treatments where they are entering.
• Direct treatment into expansion joints and slab cracks where colonies concentrate.
• Ongoing perimeter service for chronic-pressure properties.

Because pavement ants nest under hardscape you cannot dig up, ongoing perimeter service is a normal recommendation for properties with heavy pavement ant pressure. Every plan is scoped with a personalized quote.

• Seal cracks in driveways, sidewalks, and patios — pavement ants use them as both entry and nest expansion.
• Caulk the concrete-to-siding joint at the base of garages and slab foundations.
• Fix worn garage-door corner seals.
• Do not leave pet food out; sweep kitchen floors nightly.
• Keep vegetation and mulch pulled back from concrete edges.
• Repair irrigation leaks and downspout runoff that provides steady moisture along slab edges.