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Originally Posted by WhipperSnapper
Interesting. Sounds reasonable. I have never been inside so I became curious and called upon google. I've never quite seen that.
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Googling bubble deck, it does seem to be used to reduced the mass of the concrete. I had originally thought of this, but dismissed it in thinking they could just reduce the depth of the slab to reduce the concrete. Very interesting, never heard of this system before, will have to research it a bit I think.