What insulation is best?
Right now we have the spray foam stuff in our attic and the regular roll stuff in our walls. Our walls are 2x6 and we live in South Dakota (i.e. cold climate). Is this sufficient? Or should we do the spray foam stuff in the walls as well? We originally had that in the bid and then changed it because people have told us if we get good windows and doors, the roll stuff will be sufficient.