Roaches get into your home usually through tiny crevices and cracks in the wall or base of the floor. Keep in mind, it only takes the tiniest little hole for a roach to be able to gain access to your house, but once you start searching you will probably find numerous places where they can gain access.
If you have a roach infestation, you may have noticed that the roaches tend to congregate in one or more areas, usually the kitchen or the bathroom. This is because roaches are in search of food and water for their existence and they are most likely to find it in these two rooms.
Wherever you tend to see the roaches the most, is a great sign that their entryway is in close proximity. You need to get down on your hands and knees and look along the base of the floor where the wall meets the floor and look for any cracks.
There is a good chance that their entry point is hidden in a location that you cannot see such as inside or behind the cabinets or one of the kitchen appliances. Look around the base of the toilet and the tub in the bathroom to make sure that they are properly sealed.
Use caulk to seal up cracks that cockroaches use to get in your house
Now you need to make sure that all these entry points are properly sealed to make sure that the cockroach can’t get inside anymore. The easiest and best way to do this is with a caulk gun.
Go through your entire house, but spend a special amount of time in the kitchen and bathroom, and make a good seal where your flooring meets the wall.
Make sure that all sources of water are well caulked, like the kitchen and bathroom sink, the toilets, and the bathtubs. Cockroaches need water more than anything and that is what they are attracted to the most.
Now get rid of the cockroaches already in the house
Now that you are properly protected your home from a cockroach invasion, it is time to get rid of the ones who already live there. Use a cockroach pesticide, I recommend boric acid as the best one for a number of reasons.
There are a number of different products you can choose from such as cockroach gel, and bait traps which all have their advantages and disadvantages. Please reference my articles on that topic for more information.
Clean up your house thoroughly and use a solution with diluted bleach in order to clean up any smells that might attract the roaches, as well as any residual food scraps that might be lying on the floor around the counters. Keep your house clean at all times in order to keep roaches from being attracted.