There are many varieties of cockroaches.
The most common household insect and perhaps the most concerning would be, the German Cockroach. Typically known to invade kitchens and bathrooms, they will live anywhere inside a heated structure where there is food, water and harborage. While rare, in warm climates they can be found outdoors. German cockroaches can get entry a number of ways; grocery bags, cardboard moving or shipment boxes and used appliances, just to name a few. In addition to chemical treatment for successful control, to ensure there is no re-infestation, intense cleaning and sanitation is recommended as it helps control the breeding environment, thus, the population of them.
The most commonly treated in Northern Michigan are wood roaches. The Pennsylvania Wood Roach is often found in wooded areas under logs, damp wood and mulch piles. They often target log or cedar sided homes, wood piles, decks and wood planters and are very attracted to lights. Often brought in with firewood, entering through cracks and crevices or damaged screens, they are of no harm and survive only a short time indoors. Caulking, sealing and insuring screens are free of rips or gaps are effective measures in preventing the invasion of wood roaches and many common occasional invaders such as spiders and ants.