The next step, eliminating roach habitat and migration pathways, is equally important. Do not store materials or boxed items on the floor. Get rid of all cardboard - place boxed items into a sealed plastic or metal container, or remove the items from boxed storage and place them on a shelf. Eliminating sources of moisture is crucial. Fix leaky or dripping faucets and pipes.
Screen drains, and overflow pipes.
Drain overflow water away from the building. Keep areas which are frequently humid or wet cool and well-ventilated. Place garbage receptacles in dry areas only to prevent easy access to food and water in the same vicinity. Fill cracks in floors, walls, and cabinets with putty or caulk to deprive roaches of their hiding places. Caulk around pipes which run through walls, floors, or ceilings.