Confu, I was worried about that, too, but have had zero problems with the batting coming apart. I was gonna put visqueen up onto the joists, but was told it's not necessary. Haven't found anything in the buds (except for when the cat got himself locked into the basement and then I found his ass hair on the top buds that were closest to the ground. Fucking cat).
Oh, let me clarify.
If you can afford to jar all your weed, you're either (in my opinion) wasting a lot of money on jars or not having to use very many jars. You also have loads of time to just stand around burping jars. That's assuming you're having to store tens of pounds, though.
Basically, I prefer efficiency, and jars ain't it. I learned the hard way how certain aspects of growing, drying, curing, and storing change when the volume changes. I had been warned, but hadn't quite appreciated it fully til I got my first big harvest and I stood there looking at several dozen jars and said, "Oh, fuck this shit."
Went to paper bags, plastic bins and vacuum sealing and haven't looked back.
:)