Having the same wire diameter should not be confused with having the same level of reinforcement. When comparing the different types of reinforcement for crack control the calculation for the amount is to do with the surface area of steel facing any vertical section of the wall.
With truss-type reinforcement there are always three wires in contact the entire length, in contrast, in a ladder type you only have two.
With truss-type reinforcement there are always three wires in contact the entire length, in contrast, in a ladder type you only have two.
Therefore to meet the minimum requirements of reinforcement, comparing both types the truss type is needed less in the wall per square metre.
Furthermore when the reinforcement is assigned a structural role to withstand lateral side actions the only acceptable geometric configuration is the truss-type, for being the only non-deformable one in its own plane.
