CMU, no termite powder treatment or anything just standard. LACKS a metal termite shield however so I want to leave a 1/2 gap to monitor for tubes.

The company that installed the vapor barrier up the walls does encaps too. They drilled and used a plastic one-way fastener.

Fair enough. What’s the proper adhesive for rigid foam against a vapor barrier? (I would assume I could put foam on the vapor barrier I have, wouldn’t have to put it under it and against the CMU?)

For sure! I had one quote it with the sump pump work but ended up saying no because of the cost. I had them run 12 mil white vapor barrier up every wall, however, so I have a head start.

So, in terms of floor warmth and energy savings- is a full encap equivalent to insulating just the floors? Cost aside.

Thank you, I’ll read each. That’s helpful because I don’t know where this stuff is already studied and prescribed so this is super helpful. No sense recreating the wheel

Thanks for the detailed answer. I’ll re read a few times and maybe get some similar quotes if for no other reason than to hear what they would recommend. I’ve heard about and seen insulation that got humid falling out of joists and molding so, I’m cautious about that. But if I can control the humidity first then I’m not afraid of it. I just want to do the “best” option. I don’t want to circ house air through it but I’m not against a dehumidifier to keep it conditioned.

Thank you. I think I’m ASHRE zone 4. Central WV (not the mountains). Winters are not typically severe but can be single digits a few times and we recently had negatives (dry bulb) during this bomb cyclone.

So you recommend if I insulate, do it at the walls mainly because of the moisture issue?

I realize I didn’t answer your whole question. Typical temps in the crawl space during winter are probably 55-60. Long t shirt feels perfect, short sleeve if working. Humidity is typically high. We had to install a vapor barrier and sump pumps. It gets foundation run in from one side. Correcting the swale outside is on my list for things this summer but part of the issue is a cement slab that needs raised. May not be able to handle that. In other words I expect it to always have some water coming in when rainy/snowy. I plan to NOT cover over the boards in that area to let them keep breathing and I intend to place a dehumidifier in that area of highest humidity/source.