I've listed below the order I plan to attack things in, let me know if this sequence makes sense:Resolve excess moisture under house (minor grading issue, gutter required, possible plumbing leak)Repair minor roof leaks (repair flashing, seal leaks around chimney, replace tree-damaged shingles)Trim trees away from houseInstall 50 concrete piers and level foundation (foundation had work done previously but shifter due to excess moisture)Install vapor barrierAdd structural roof support beams in attic, add insulationRepair rotten siding/soffit/window frames (mostly upstairs)Repair porch (replace rotten boards, sand & paint)Paint exteriorInstall central AC/Mini-split system (any recommendations on this?)

You could get the metal corner beads to rust from water vapor transmission thru the slab on grade.

I'll let a contractor weigh in but I'll bet that old vinyl will act as a vapor barrier for your new floor.

Insulation and vapor barrier.

Here are the comments:Nick Aalerud Meth labs are tough... definitely not for newer investors...19 hours ago · Like.James Gage Have to encase them or do a total rip out like lead....13 hours ago · Like.James Gage If you encase don't forget vapor barriers.13 hours ago · Like.Nick Aalerud First you need to call the local police station though, to ensure investigations are not ongoing.

But that is what it looks like in the photo and can't see the ceiling.Old houses used tar paper as a vapor barrier and can be changed out, maybe during an electrical update.

We look for a dry crawl space, vapor barriers, and windows/doors that seal completely.

We installed drains, sump pump, vapor barrier on the walls.

There’s already a vapor barrier under the house, but sometimes water pools on top of it.

Repaired and painted fencing; repainted and repaired exterior where needed; lawn care; interior paint in all bedrooms and bathrooms; small repairs within interior; added hardware to kitchen cabinets; removed insulation from crawlspace and added vapor barrier; flashing and siding repairs; removed junk from yard and exterior building...