Rim joist insulation, embedded mud sill – GreenBuildingAdvisor

hello,

Im looking to finish part of my basement and started to insulate by gluing 2” XPS to the walls. The original plan was to cover rim joist and top of the walls with 2” XPS as well and seal them with spray foam. I used this method last year when I build my wife an office in the basement.

Im now realizing I may have gone about insulating the rim joist area wrong when I built my wife’s office, due to the fact I have embedded rim joist(without a capillary break)and my floor joist make contact with the top of the concrete wall. 

My concern is trapping condensation where the joist and sill contact the concrete causing rot. I’m wondering if I should change my methods? Possibly installing a poly sheet under the effected floor joist (probably wouldn’t do much for my mud sill)or injecting borate rods. 

-house with built circa 1994

-The rim joist was originally all insulated with 1.5” EPS and sealed with calking. I tore a couple pieces out and didn’t find any moisture.

-bottom of the rim joist is 7-15” above grade, seems to have good drainage, have never had any moisture issues in the basement.

– I assume I have a PT mud sill but is hard to say for sure.

-no exterior rim joist insulation, just ship lap siding with tar paper 

-house is located Nova Scotia, not sure of climate zone.