I don't know if this is what did it for me but here goes; I had a bad roach problem in my bedroom about a year ago. The bedroom has a bathroom within. Every day there were at least 2 roaches that I would have to kill. One time there was 8! Now this is a tiny bathroom so the plumbers who installed the toilet had to knock out part of the wall to make it fit. I noticed that behind the tank was a narrow opening in the wall so I caulked the hell out of it. That seemed to work but there were still some smaller roaches coming in. Fast forward a couple months and the toilet backed up so I go out on to the roof to snake the vent pipes. On a whim, I thought why not close these off somehow? So I got some aluminum screen and zip tied a layer of screen over every vent pipe I saw. Now I see a dead roach once a month. Keep in mind that I've sprayed raid pretty consistently throughout my ordeal so I don't know if that's the reason or the screen or a little of both. Hope this helps!
I don't know if this is what did it for me but here goes; I had a bad roach problem in my bedroom about a year ago. The bedroom has a bathroom within. Every day there were at least 2 roaches that I would have to kill. One time there was 8! Now this is a tiny bathroom so the plumbers who installed the toilet had to knock out part of the wall to make it fit. I noticed that behind the tank was a narrow opening in the wall so I caulked the hell out of it. That seemed to work but there were still some smaller roaches coming in. Fast forward a couple months and the toilet backed up so I go out on to the roof to snake the vent pipes. On a whim, I thought why not close these off somehow? So I got some aluminum screen and zip tied a layer of screen over every vent pipe I saw. Now I see a dead roach once a month. Keep in mind that I've sprayed raid pretty consistently throughout my ordeal so I don't know if that's the reason or the screen or a little of both. Hope this helps!