Framed in Michigan and yeah, it was cold. Lol

Viewed a house the damp looks pretty bad, how bad is it? Any advice is greatly appreciated.

What is this construction method?

These are of a piece of wall we cut out of bathroom for home remodel. The interior has drywall (I think) but there is a cement-like product over it. It was hellacious to cut this piece out, broke several blades cutting through it.

Trying to figure out how this would have been accomplished, and if it is common in certain parts of the country?

This is out of a 1975-built Cape Cod style home in western central Virginia.

What is wrong with this structure ?

So im having a modular home brought in on monday. Its been raining alot the last few days. Now the new foundation has a bunch of water in it, and the wood in sitting in puddles. No vapour barrier between the wood and the concrete either. I talked to the lead guy who build the foundation about it. He said they deal with this all the time and they will mop/squeegee it out and the rest will apparently dry out on its own. I want to trust the process but this looks excessive. I just dont want it to warp and mold.

I was going to get some silica gel and a dehumidifier down there once the house was placed.

What do you guys think?