Cockroaches can become a problem if the following preventative measures are not taken (Provided by Orkin.com) Prevention and Sanitation
American roaches can move from one building to the next during the summer, entering through cracks in foundations, around loose-fitting doors or windows, and along water and gas pipes. Seal openings with putty or plastic wood. Inspect sacks, cartons and boxes, etc., brought into the home and destroy any roaches. Sanitation is critical in roach control. Clean up spilled foods and liquids, avoid leaving scraps of food on unwashed dishes and counter tops, keep food in tightly sealed containers, rinse cans and bottles before putting in trash and transfer garbage outdoors into roach-proof receptacles.