I've been doing a lot of reading. I live in Maryland, not particularly cold. We have an 8 foot ceiling in the basement which is poured concrete built in 1973. Only about a foot is above grade. I've done the tape and plastic test and let it sit for a couple years with no issues. We do have a dehumidifier in the basement. When we bought the house 5 years ago is had a slightly mildew smell. I believe they had had water issues before but they were rectified with grading and such outside. I messed up and added about 100 feet of framing before insulating. I left a bit of space between the studs and walls so i can make sure the walls are true even if the basement isn't. I did paint the areas behind the walls with Drylock. I still have the majority to do.
Is drylock sufficient to use R-15 batt? Or should I skip it entirely?
If not then should I put in EPS/XPS? (again Drylock?)
Would I really need more than that? We aren't in the mountains but it is a little chilly in very very cold weather (cold for us anyway, like 12F outside).
I have a feeling once I add returns and vents int he basement it would clear up any potential mildew buildup just having air exchange.
My father is very much pushing for plastic and batt but I'm concerned about the batt becoming a sponge. I've read up on the building science site. Still concerned because they always talk about Canada and New York.