Do you have to have insulation?
We have an unfinished basement. I guess they are poured walls - not cinder block. The house was built in 1999. You can see some places where there were leaks, but we've been there for 3.5 years and built up the ground outside so water flows away from the house. There have been no leaks in 3 years. We also have a sump pump. We are finishing the basement. Do we have to put insulation? Can we just put up 2x4s and drywall? This weekend it was in the 20s and the walls were not very cold. Our basement really isn't cold - it's cooler than upstairs, but not cold. Oh, we live in southeastern Michigan. Thanks!