Smooth milled polymeric foam article

An article comprising an extruded polystyrene foam, the extruded polystyrene foam characterized by being a singular polymer foam that is free of halogenated blowing agents, having a milled primary surface, having a width of 750 millimeters or more, and further characterized by having a ρ(CST/CSP) value that is 50 kilograms per cubic meter or less and a milled primary surface where ρ corresponds to the extruded polystyrene foam density, CST corresponds to compressive strength of the foam in its thickness dimension and CSP corresponds to compressive strength of the foam in a dimension perpendicular to the thickness dimension of the foam.