This is a complicated question to answer. Not all roaches are created equal. And, not all homes are created equal. Keeping roaches out of an old home is significantly more complicated than keeping them out of a new home with proper sealing. In some situations, it is impossible to fully roach-proof. But, fortunately, most of the time, roaches can be entirely excluded--or at the very least, put into a no threat category.
The problems roaches pose, and tips that can address them.
You are not dealing with your ordinary bug here. Some roaches, like the German cockroach, can be quite tiny in the larvae state, making it possible for them to get through a hole the size of an electrical outlet. It's okay. You can gasp. That is definitely gasp worthy. To prevent roaches from birthing thousands of babies in your home, you need to get rid of all food sources. Deep clean the outside of your oven where food drips or drops. Clean under your fridge where juice runs under. Clean around the toaster where crumbs linger. If you have organic matter on any surface in your home, you will encourage roaches to stay and multiply.
If you think baby roaches are bad, here is a fact about adult roaches that will leave your belly unsettled. Roaches can compact their bodies to squeeze into very tight spaces, allowing them to get under hinged doors or through the gaps between sliding doors. This ability to compress themselves can make them half as tall when needed. If you're hoping to keep this insect out, you're going to want to make sure all your door sweeps and weather stripping are in good working order. And, do an inspection of your basement and exterior walls for gaps, cracks and holes that roaches can use as an entry. In most cases, a caulking gun will seal those areas adequately.
This is an insect that can climb walls and traverse ceilings at a heart-stopping speed. That means it can get access to all your windows. Be sure to check your screens. If you have any holes, even tiny ones, get the screens repaired, or fix them yourself. There are great how-to videos on Youtube for doing screen repairs on the cheap.
If all of these factors were not enough, some roaches can fly as well. That means an open door or window offers quick access. So, keep the door closed while you go to get that second load of grocery bags from the car.
If you apply all the tips mentioned in this article, you can significantly affect the number of roaches living in your home, but being roach-proof requires an additional step. Contact a professional pest control company for help preventing and/or controlling cockroaches. At McCall Service, our home pest control program targets roaches and other household pests using products and techniques that are safe for you, your children and your pets. Sure, it's possible to make your home roach-proof but it isn't easy. Let us do the hard work for you!