Spray foam – rim joist and sill plate – GreenBuildingAdvisor

Hello,

I have a house in Zone 5 with a poured concrete foundation, at least 10 inches above ground, with slope towards back.

The basement walls have 5” Type 2 EPS (unfaced) insulation installed.

Regarding the rim joist and sill plate, some sections of the sill plate have pink foam and poly,

I’m considering using P90 spray foam for the rim joist and sill plate, continuing the insulation down to meet the EPS. The P90 foam I’m planning to use is a low-density, hybrid product (approximately 30% open cell, 70% closed cell) that feels relatively soft.

Questions:

1. Would fully encapsulating the sill plate with this foam create a moisture issue by preventing it from drying properly, given the potential for moisture wicking from the concrete foundation?, I’m worried about drying potential since I will encapsulate it
2. Are there any concerns about long-term moisture management with this approach?

I will add that I do have high water table, but never had any water issues in basement always dry

sill plate and rim joist are not pressure treated

thank you