Basement & Crawl Space Pest Inspection Checklist

Inspect all foundation wall cracks — even hairline cracks must be sealed with epoxy or polyurethane injection; groundwater seepage brings persistent moisture that attracts every type of pest

Measure basement or crawl space relative humidity with a hygrometer — if it consistently exceeds 60%, install a dehumidifier or improve ventilation; dampness equals paradise for termites, cockroaches, silverfish, and booklice

Check where all wooden beams and floor joists contact the foundation wall — direct wood-to-concrete or wood-to-soil contact is the number one cause of termite infestation; there should be a metal sill plate barrier

Inspect joist and beam surfaces — tap with a screwdriver handle and examine with a flashlight at an angle; look for mud tubes, bore holes, hollow areas, and fine sawdust accumulation

All utility penetrations through walls (water pipes, electrical conduits, gas lines) — seal around them with steel wool and caulk as a dual barrier to prevent rodent and snake entry

Check ventilation opening screens — all crawl space vents must have stainless steel fine mesh (mesh smaller than 3mm); replace any damaged screening immediately

Inspect the floor for standing water or persistently damp areas — investigate pipe leaks, poor exterior drainage, or groundwater seepage; you must resolve the water source problem first

All items stored in the basement or crawl space — must be stored in sealed plastic bins; eliminate all cardboard boxes (cardboard equals food for cockroaches and silverfish plus nesting material for rodents)

Check for rodent droppings (black rice-grain-shaped), bat guano (crumbly, shiny insect exoskeleton fragments), and snake shed skins — each type of dropping calls for a different response plan

The basement sump pump pit — must have a tight-fitting sealed lid; sump pit water is a prime mosquito breeding and cockroach drinking source