I am building a cabin in NE Texas, I can not find anything on insulating the raised floor except closed crawl space. I want an open crawl space but would like to use 1/4 inch PT plywood on bottom side exposed to out side to keep out the varmints and minimize bugs. Would I use pressure treated wood on out side, then house wrap, then insulation, then inside T&G flooring? And no vapor barrier insulation by using the house wrap. Or am I way off base here. Has anyone had any experience with this type of setup. My wife hates bugs inside
Thanks for any info RLS

Look into TAPS insulation. It's a sealed roll insulation with an insecticide impregnated wrapper. It seems to be a good bit more effective than PT wood, but I don't know about longevity.

http://www.tapinsulation.com/

NE Texas is a 'hot, moist' climate and there should be no vapor retarders used at all.

Or if used, vapor retarders should be on the exterior side of the floor or wall assembly.
----
Housewrap is fine but remember, housewrap is an air barrier, not a vapor retarder.