Crawl Space Insulation - Will this work?
Hello and welcome pjh, to the best darn DIY'r site on the web.
You say your crawl is enclosed, if totally enclosed (no vents) than you could use a minimum of 2" XPS on the walls, lay 6 ml plastic on the dirt and add a couple of heat registers to help dry the space out.
As for the flooring I would go with what is recommended by the manufacturer, I am not certain for laminate, but, hardwood underlayment can be 15 lb (roofing paper) felt paper.
When its all said and done there is usually more said than done
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