Hey Cam, I just wanted to tell you something that works for my crickets that stops them from climbing. I tried vaseline and it's such a big mess and I did not like it, seeing as some of them even climbed on that too.. so then I tried "Scotch Moving and Storage Packaging Tape and that works great, stops the crickets from climbing. It's super smooth and doesn't make a mess.
Now, I don't know if this will work for roaches but it stops 1/4" crickets which are known to be good climbers, just thought I'd let you know figured you could give it a try.