Before the insulation for the walls is installed the room studs must be installed. The choice was wood or steel. Surprisingly to me, the cost is the same. I went with steel, as it is resistant to mold and termite proof. The door frames are encased in wood 2 x4″ lumber to decrease the chances of the steel, at the doors, from twisting out of plumb. The second floor ceiling is insulated with SealTite PRO Open Cell insulation. The R…