Is polyiso board or styrofoam best for insulating when finishing a basement in CO?

Evan B.
Updated: Aug. 27, 2020

We have a concrete basement in decent condition that's about 20 years old in Boulder CO and having had mitigation installed for high radon levels we now want to use the room more. It's currently completely unfinished, nothing on the walls - what's the best way for us to finish and insulate our basement so it's easy to heat and doesn't get mold problems in the future? We're thinking of doing this job ourselves, do you think it's possible for reasonably competent DIY'ers to complete?

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