Not 100% sure but eps lets vapors and liquids through. XPS is more resistant. There is a video about it demonstrating with colored water. As such, if using foam boards, I'd stick with xps and use it as a drainage plane, vapor barrier and air seal, and don't mix the two.
Rockwool is more moisture resistant but it's not going to solve any water problem, if you have it. Underground bsmt is protected by the ground against temp changes. As such you don't need as much insulation. But if thin and 2" boards were spaced away from the wall and there is gap or room for air to move into the living area, none of it is effective. Same with rockwool. You have to enclose the insulation and stop the air movement in and around the insulation.
I didn't know that xps can lose half the value. I read about some loss over time. This is true for all other insulation. Gas in the double glazed windows, example. Face value of insulation is when it is installed. After that, it is a guess, but it is better than having none.
Rockwool is more moisture resistant but it's not going to solve any water problem, if you have it. Underground bsmt is protected by the ground against temp changes. As such you don't need as much insulation. But if thin and 2" boards were spaced away from the wall and there is gap or room for air to move into the living area, none of it is effective. Same with rockwool. You have to enclose the insulation and stop the air movement in and around the insulation.
I didn't know that xps can lose half the value. I read about some loss over time. This is true for all other insulation. Gas in the double glazed windows, example. Face value of insulation is when it is installed. After that, it is a guess, but it is better than having none.
