The original wall construction was brick, cavity, brick, plaster.
This is now brick, graphite beads, brick, 24mm foil faced PIR with battons every 400-600mm(changed our mind half way through) then another layer of 24mm foil faced PIR then plasterboard(drywall) and skimmed to finish.
The top layer of PIR was sealed around the edge with expanding foam and all joints foil taped.
