That is also what I'm learning about moisture and humidity control Jay. Seems like there are too many seasonal, climate, and locations variables that are changing all the time. Every time you try to put up a barrier, then that stuff finds another way around and sometimes gets trapped in a place where it will do damage. It is hard to keep the earth's atmosphere from equalizing. We can control alot of it but not all unless we live in a bubble like that bubble baby that was on tv a few years ago.
Ships aren't water tight either, they just use bilge pumps to keep them afloat. I was reading where the SR-71 black bird spy planes leaked fuel like crazy on the ground but at high altitude at mach 3, the fuel tanks stretch into place and seal off. I guess we have to adjust to the laws of physics.