a soundwall and components are described that incorporate a significant amount of plastic materials while still retaining the strength , durability and resiliency necessary for the soundwall to resist wind loads and weathering . an exemplary soundwall is described that is composed of prefabricated sound reducing modules anchored by support posts which are themselves constructed from a significant amount of plastics . the modules used in this exemplary wall are formed from an internal support frame which , in a preferred embodiment , is constructed from reinforced plastic lumber members . the support frame is covered by an outer sheath which , in alternative described embodiments , may be formed from reinforced plastic sheets or plastic lumber members . methods are also described for fabricating the individual modules , support frame and support members as well as the soundwall itself . soundwalls constructed in accordance with the present invention result in an unexpectedly great reduction in sound . the high plastic content of the soundwalls and their components permits greater amounts of recycled plastics rather than other materials to be used , thus providing environmental benefits as well .