Answer-first
Cockroaches enter East Texas homes through four main routes: grocery bags and cardboard boxes (the #1 route for German cockroaches), used appliances (especially secondhand refrigerators and microwaves), shared plumbing walls in duplexes and multi-unit homes, and exterior gaps under 1/16 inch — weep holes, foundation cracks, garage seals.
When this applies to your East Texas home
- You just brought home groceries in cardboard cases or paper bags from a warehouse store
- You bought a used appliance (refrigerator, microwave, dishwasher) in the last 6 months
- You live in an apartment, duplex or triplex with shared plumbing walls
- You had roaches, treated them, then reintroduced them via cardboard or bags
- Recent construction near your home displaced an existing outdoor roach population
Failure modes we see in the field
- Storing cardboard indoors: cardboard is roach habitat AND food. Break down boxes at the door — never bring them into pantries or garages
- Skipping used-appliance inspection: a secondhand microwave or fridge can house 200+ roaches in the compressor housing or under the drip tray
- Ignoring exterior gaps: American cockroaches migrate indoors through weep holes and garage seals, especially after heavy rain
- Ignoring shared plumbing walls: in duplexes, treatment on your side alone is often defeated by the neighbor's population
What actually works — the proof
Effective exclusion for cockroaches: seal weep holes with copper mesh (never caulk — brick needs to drain), install garage-door bottom seals, seal HVAC and plumbing penetrations, and use a receiving protocol for groceries and used appliances. Combined with baiting, this cuts reintrusion by 85%+ over 90 days.
Your next step
Book a free cockroach entry-point inspection. Our tech maps the top 5 entry routes for your home, places matched bait and gives you a written exclusion checklist. Free with any SPOTGuard plan.
Reviewed by the field team
The Spot On Team · Spot On Pest Control
Family-owned in Lufkin, TX · Texas SPCS Business License #License #805260072 · Serving the East Texas Piney Woods since Pawpaw's day.
Frequently asked
Do cockroaches come from outside or inside?
Both — depending on the species. German cockroaches (small, tan, kitchen-loving) almost always enter via cardboard boxes, grocery bags or used appliances. American cockroaches (larger, reddish-brown, occasional invaders) enter from outdoors through weep holes, garage seals and sewer connections. Different species, different entry routes, different treatments.
