The ornamental design for a barrier for isolation of metal structures, as shown and described.
FIG. 1 is a front, top, left side perspective view of a barrier for isolation of metal structures showing my new design;
FIG. 2 is a front, top, left side perspective view thereof, showing the barrier for isolation of metal structures in an environment of use;
FIG. 3 is a front elevation view thereof, the rear elevation view being identical thereto;
FIG. 4 is a left side elevation view thereof, the right side elevation view being identical thereto;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The dashed lines in FIG. 2 represent environmental structure and form no part of the claimed design. In FIGS. 1-6 the barrier for isolation of metal structures is shown with symbolic breaks along its length and width. The appearance of any portion of the barrier for isolation of metal structures between the break lines forms no part of the claimed design.
The barrier isolates metal structures from contact with concrete or other surfaces.