Exterior Wall Insulation Exterior wall insulation using Dow Styrofoam extruded polystyrene boards will considerably reduce energy loss through external walls of new and existing buildings. Exterior wall insulation provides a good substrate for any finishing jobs such as plastering, dry ling and rendering. External walls should be insulated to reduce radiant, conducted and converted heat … Continue reading Exterior wall Insulation – (XPS) Extruded Polystrene