Non-metal decking for use in association with residential structures; PVC decking boards for use in association with residential structures, the PVC decking boards impregnated with a dense foam interior to fill in voids and gaps in the material, create a dense cell structure, and reduce degradation from moisture or microbials; light-weight decking boards for use in association with residential structures, the light-weight decking boards having a rigid, PVC outer layer with a dense foam interi...