implementations of the present disclosure provide an environmentally resistant structural member for use in areas exposed to water or other environmental elements . the structural member includes a core member and a polymer layer . the core member has an environmentally sensitive composition wherein extended exposure to the environmental element causes degradation of the core member . the core member includes at least one surface , such as a bottom and side surfaces . the surface is configured for positioning in the area exposed to the environmental element . the polymer layer has a molded shape and covers the surface so as to seal the surface of the core member against exposure to the environmental element .