This is some prefab construction built circa 1960, if I'm not mistaken First, I would go with a plastic six-mil vapor barrier.

Would have still worked great as a BRRRR but with everything going on, we decided to cash out now so we can chase bigger stuff.Here are the key stats:- 2/1, 945 SF house in Sans Souci neighborhood of Greenville, SC- Purchased from a wholesaler for 65K cash- Final rehab budget came in at 57K - basically new everything minus the major systems, had to replace subfloor/ a few joists in bathroom due to previous leaks, removed a wall between kitchen and living room, new appliances (minus fridge), new patio, privacy fence, removed trees, vapor barrier, insulation in crawl space, etc)- Sold for 160K in 3 weeks- Netted about 24K after holding costs, commissions, closing costs, etc- Entire process (initial purchase to closing) took about 6 monthsBiggest lesson learned: we did too much! 

I'm looking to do a vapor barrier to reduce any potential moisture, Insects, raydon, just better over all air quality is what I'm going for.

Well any basement can be waterproof with proper drainage and waterproofing technology (vapor barrier, proper underlayment, etc.).

As part of doing a light rehab, I was suggested to install a vapor barrier in the crawlspace of the house.

Additionally, they recommend installing new vapor barrier.

When all these newbie flippers and investors vaporize, that's when you know it's time to go make some deals.

I like to put a vapor barrier (layer of plastic) and reinforcement into the slab.

The demand for commission will most likely vaporize with that. 

The vapor dissipates pretty quick.