Specific construction how-to advice is not really our strong point here; we focus more on OPERATING pools, than on BUILDING them.
I'd see if the website associated with your brand of vermiculite has application data -- that will be, by far, the most reliable advice. Also, poolspaforum.com has a lot of builders registered. I don't know if they will answer your question or not, but some of them could. Just remember to put your sales resistance hat on -- that forum is moderated VERY differently than here, and there are quite a few spammers and so on registered and active.
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