Did you have insulation in the joists before the crawl space tidy up?

Do you run a dehumidifier in the crawl space?

Moisture trap with the new work. You will need to run a dehumidifier or vent it.

Yes, there was insulation before; the same kind of pink batt is used now, tied up to keep it in the joints.

No dehumidifier; there are multiple vents to the outside, so wouldn't I be dehumidifying the world? (like my dad used to say I was 'heating the whole outside' when I left the door open)

Moisture trap? Not sure I understand, but it is vented, in multiple spots.

Does the insulation have a vapor barrier on one side?

Well: I assume so. I can check tomorrow. That's really an interesting point.

Right you are, live_wire, and I still don't. There's a lot of information in that link!

The vapor barrier should be facing down. Or you will need to switch to spray foam to completely seal it.

Facing down? towards the ground? If there is one, it must be facing up, towards the house. What I saw when I was there was the pink insulation.

Yes and wrapped with plastic or covered with foam board and taped seams. It needs to be completely sealed

OK! no vapor barrier on the insulation tied under the floor joists. And, according to contract, it is 'new R-30 fiberglass batted insulation, secured with twine.'

You Need a vapor barrier. The batting will collect condensation and evaporate onto the floor above instead of drip down. You will need to seal it. Either plastic or foam board with taped seams and spray foam any gaps. Have to keep the batting dry.

oh golly. I'll certainly look at this right away. — so, I need to take out the new insulation and replace it with insulation that has a vapor barrier? I would have thought the professional crawl space people I hired would have known this? I'm not doubting you at all, but just trying to figure out what happened.

Remove the insulation and allow the floor to dry out. When you're ready to re-insulate. Have the underside of the subfloor crawl space spray foamed, so it is air tight.

The faster you get it down, the better off your floors will be. I suspected that was the problem,when I asked if you had insulation before. Apparently, you did, but, some was loose, and most likely it did have a vapor barrier on it. You need to leave the insulation off for a month or two. That floor needs to dry out completely. Get some air circulation in that crawl space as soon as you get the insulation down. Here, we are recommended not to put insulation, other than the spray foam type under our houses, because, there is a lot of humidity etc in this area.

OK, from quick reading it seems that maybe I should have told you that I'm Pacific northwest; it's seldom below freezing, and summers are dry. Humidity is pretty much unknown.

What I'm reading says that for my climate " Fiberglass batts should be unfaced and installed so they make contact with the underside of the subfloor." Unfaced batts are what I have now. — however, the batts aren't in contact with the subfloor above. If you can accept the premise that this is OK for my climate, how important the contact issue?

And, again, thank you very much for your help.

— also, the crawlspace walls are poured, not block.

Do you have plastic on the dirt in your crawlspace?

Black 6 ml vapor barrier.

You need to prevent condensation on the batting. Replace the wet stuff with dry ones and install 6 mil plastic. Tape all seam and ends. Treat it like a finishing a wall in a basement. Prevent condensation and you won't have moisture issues.

You can use insulation foam board, which would be easier. Just fasten it to the joist and tape the seams and spray foam the ends. Any condensation on the underside will drip down.

Well, it's dry down there; never had a moisture problem. A cardboard container that was left there for several years is pretty limp, but no sign of mold. The original problem was with mice, who apparently like it because it's dry. The professional crawlspace company I used would, I'm sure, been very happy to tell me of any moisture problems. — but, now my hardwood floors are wavey. The insulation I checked yesterday seemed dry, top and bottom, but it's not in direct contact with the subfloor. I guess I'm missing something?

Again, very sorry to be so dim.

You have a pro telling you want to do, he does this for a living. The next step is up to you.......................................

Yours dont fit through the finished wall, so can get tiled around, and there is nothing on them, to actually hook a faucet spout too. Only the handles, which doesnt do you much good.