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I had roaches multiplying like crazy that were coming from the smallest cracks around my bathtub and the baseboards in the bathroom. You have to seal the cracks or else they WILL find a way in! Here is how to prevent cockroaches by caulking your bathroom. Definitely something you can tackle on your own.

Remember, they love water and moisture. So the bathroom is a perfect place for them. Also, roaches can squeeze in the tiniest of crevices, they can squeeze in spaces 1/16 of an inch up to 3/8 of an inch! They actually enjoy the feeling of having to squeeze in small places. So you have to make sure you prevent them from coming into your home by blocking all of these passage ways.

So instead of debating why cockroaches exist, one of the best things you can do is caulk your bathroom. And i’m talking about the inside of your tub or shower and also the bathroom floors. You don’t want water getting under your floors and behind the walls. Not only will this help get rid of roaches, but it will also protect your bathroom from mold.

Caulking your bathroom does take some time. But it is an easy do-it-yourself project.


  • Caulk.You want one that is mildew and water resistant. I used this one. I liked it because you can actually squeeze out of the tube and not have to buy a caulking gun. 
  • Sponge with Water. 
  • Blade
  • Metal or flat scraper
  • Bleach or some other mildew killer
  • Masking Tape


Here is a video that will show you how to do it.

Here are some things to keep in mind after watching this video.

The hardest part of caulking is getting rid of the existing caulk. Remember, you can’t be lazy here. If you don’t get rid of the existing caulk, there is a good chance some bacterial and mold will start to grow in your new caulk after some time.

You want to make sure you get rid of the existing caulk and clean it with some powerful soap. Let it dry. It’s not a good idea to caulk over wet surfaces.