Cockroaches have multiple ways to enter your home, but the most common ways are through cracks and holes in doors and windows. These openings can be as small as one-eighth of an inch, so roaches can squeeze through them. They can also enter your home through pipes or holes in walls.
Cockroaches like to live in warm, humid areas, such as cardboard boxes. These materials absorb their chemical pheromones, allowing them to find each other and organize themselves. Therefore, if you notice cockroaches living in your home, you should dispose of these items or replace them with plastic bins. Likewise, you should avoid leaving newspaper piles indoors.
Cockroaches can get into your home through small gaps, but they cannot fly. However, they can be easily carried from one place to another by humans. Some species can even scurry into boxes without being noticed. They are also known to live in warehouses and cardboard boxes.
German cockroaches are small, light brown roaches that often hitchhike into homes. They can live in small spaces like the corners of refrigerators and appliances. This makes them difficult to spot, but their breeding ability is very strong. In a month, these cockroaches can go from a baby to a mother cockroach.
Other ways for cockroaches to enter your home include gaps in the walls and garage door, cracks around windows and doors, and utility lines. Sometimes, roaches are carried in your home from neighboring apartments. Likewise, they can migrate through plumbing lines, vents, and foundations.