I have an old Home that I am rehabbing for a rental in Lower TN. The wall structure consists of Brick, Felt, diagonal 1x6 tongue and groove planks, 2x4's, then Horizontal 1x4's completely covering the interior wall, in that order. The interior 1x4's only had Wall paper, no drywall or any other coverings. There is a living room section that has plaster or stucco on top of what appears to be 16" drywall strips.
I am looking at blowing in insulation before dry walling over the interior, but I am worried about condensation, or other problems that this may cause. I was wondering if i could blow in insulation, cover the boards with Plastic as a vapor barrier, then cover the plastic with Drywall. Will that prevent the condensation issue, or will that just cause to condensation to form on the 1x4s and compound the issue?
If I am unable to insulate and prevent problems, I may skip the insulation and just put the plastic up to stop any airflow, but don't know if that would cause the same issue as having the insulation in the wall. What would you do, or what is the best way to go about this, keeping in mind that I do not want to remove the interior lumber.