Why not take advantage of the available square footage in your basement and not just leave it as a storage room. By finishing out a basement or at least insulating it, you’ll be able to enjoy more of your home as well as save energy.
One Project Closer went through the process of selecting basement insulation and they considered all of the major options including fiberglass, wet cellulose and spray foam.
They chose closed cell spray foam:
While closed cell spray foam is slightly more expensive than other methods, it offers high R-value with the best mold resistance. Given that we’ve invested thousands of dollars in radiant floor heating, we believe that the higher cost is justified and would recommend this method.
Recycled denim insulation and cotton are other options to consider if you are going green.