Abstract: An outside STYROFOAM.upsilon. polystyrene plastic wall or fence is constructed by anchoring each of at least two styrofoam H-columns to a concrete base in the ground supporting a steel reinforcing bar which extends up into a hollow of the column by filling the hollows with concrete. A STYROFOAM.TM. polystyrene plastic panel is supported within the grooves of juxtaposed columns. The fence may have any desired length. The panel is secured to the two columns by L-shaped rebars or a continuous length of rebar laid in a recessed groove atop each panel and column and anchored in the concrete in the column hollows. An exterior mesh-stucco or paint finish covers the wall. Columns--in--line, L, T--and panels--square or T--enable making walls of any shape or configuration.