Here's a pic of my house. That entire 1 story forward portion is sitting on a 3 foot crawlspace that opens to my laundry room (rear lower floor of house on a slab)
The crawlspace pretty much has a dirt floor. It looks like when it was built they laid down some building paper, but that has all deteriorated.
My ductwork for the forward portion of the house runs through here as does my kitchen piping but it is all insulated, so it seems there are 2 ways I can go with this.
Treat it as a mini basement and insulate the walls. Treat it as "outside" space and insulate the ceiling of the crawl (floor of my house).
In either case I have to lay down 6 mil plastic over the ground, correct?
Insulating the walls looks like it has more downside with pests and water condensing on the block and stuff. But the crawl I believe is causing a serious humidity issue in my laundry/mechanical room. My trunk line condenses water on top of the furnace, running a little kenmore dehum I had helps, but doesnt completely negate the issue.
It appears at one time the walls were insulated and it got pulled down for some reason (termites in the furring maybe>??)
What's the latest and greatest thinking on this? I find conflicting info when I search online.