Might not need it? Ultimately these are the "bones" of the wall to which you afix stucco or house wrap + furring strips + siding on the outside. Inside would

Might not need it? Ultimately these are the "bones" of the wall to which you afix stucco or house wrap + furring strips + siding on the outside. Inside would be stucco (if in warm weather climate) or furring + insulation + wall board (if in cold weather climate).