I think I misunderstood what the concrete guy was trying to describe. I'm betting he meant this, because no way would they place any membrane over a year prior to pouring the concrete. I mean, the fill material sat there for over one year before they dug in, made forms and drove piling I think I screwed up on my initial drawing. They had to place the membrane after they dug all those huge footings. oooops.The vapor barrier should be directly below the slab, not the aggregate because of water intrusion into the aggregate it can become a doughboy swimming pool.
The guy from the concrete company described the membrane as "the bladder" I suspect it may be in more than one layer. The building was not hacked together. It's extremely well engineered and thought out, with moisture issues being very high on the list because of it's location.
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