So, I will try to explain this as well as possible. I am finishing the basement of our new home built 2 years ago. One exterior wall is a half wall (cinder blocks roughly 4' up). The builder has then insulated and vapor barriered the remaining top of the wall. This wall has 2x6's running up over where the ceiling joists are which will cause me to install a 2x4 along the 2x6 studs parallel to the other joists to use for the ceiling. All of the electrical will obviously be running in the framing I did in front of the half wall. Will I still need need to install blocking between those 2x6s behind the installed 2x4? I've heard varied opinions due to the wall being insulated already. Ideas?