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Another way to think of barriers is to grow certain plants around the periphery of your home.
You can use the same trick for fly control. Just substitute the above plants with mint and basil which repel flies, but smell good to humans.
Boiling water is excellent for ant control or if you see where they are creeping into your house, squeeze some lemon into the hole or crack.
Barriers also work for snails. They dislike sand, lime, copper or ashes, so use these borders to keep snails away.
Baking soda and powdered sugar mixed in equal parts is a good roach killer. Just spread around the area where you see roaches and soon you won't see them anymore. (Boric Acid, while slightly more toxic, is naturally occurring and is another way to get rid of them.)