How do pests get into a house on a concrete slab?
Through the edges and openings: cracks and expansion joints in the slab, gaps where pipes and wires pass through, the garage door seal, door thresholds and vents. Argentine ants travel up to 100 feet to find food, water and shelter inside buildings, and rats enter any opening larger than a nickel.
Slab houses have fewer hidden voids than raised-floor houses, but the wall cavities, attic and garage are still routes. In a dry summer, ants follow the moisture along a bathroom drain or a sink supply pipe, which is why the technician looks at where the plumbing comes through the floor.
A thorough inspection covers inside and out, since a ground-level entry point at the slab edge and a trail on the kitchen counter are often the same pest.
Do slab houses get termites?
Yes. UC IPM says subterranean termite colonies need soil moisture at all times, and a slab sits on the soil. Termites can come through cracks, joints and penetrations in the slab, or build tubes up a stem wall. Drywood termites do not need soil contact and can attack the framing and roof of any house.
The two types need different answers: subterranean termites are handled with soil and wood treatment near the ground, and drywood termites with spot treatment or fumigation of the structure. Our termite fumigation page explains the second route.
A California inspection report covers visible and accessible areas, and a slab limits access to the underside of the floor, so the report may flag areas for further inspection.
Why does the landscaping around my house matter for pests?
Landscaping gives pests water, food and shelter right next to the house. UC IPM lists leaking faucets, sprinkler heads and irrigation among the water sources that draw roof rats, advises pruning plants away from the house for Argentine ants, and notes that dense vegetation such as ivy is a nesting site.
Newer subdivisions often have young irrigated landscaping against the walls, and sprinklers that spray the siding keep that wall base damp. Adjusting the spray, trimming back shrubs and keeping mulch a few inches from the foundation takes away the water and the bridge.
Our guide on Argentine ants in a Sacramento summer shows what that water-seeking looks like in practice.
What should I check myself between visits?
Walk the slab edge with a flashlight once a month. Look for ant trails, mud tubes, fresh burrows, droppings and gaps where pipes come through the wall. Check the garage door seal, under-sink cabinets and irrigation heads, and note anything new for the technician so the written report is complete.
Keep a small list on your phone. Dates and locations help the technician see a pattern, such as ants only appearing at one bathroom, and decide where to place bait.
Photos help. A quick picture of a trail, a tube or a gap lets the technician decide what to bring before arriving, and it shows you whether the problem is growing between visits.