A deformation and weather resistant, noise attenuating fencing assembly comprises a series of hollow posts, each post formed of a fiberglass reinforced resin, having spaced apart load bearing walls defining an exterior surface, an interior surface, a first open end and a second open end. The structure-reinforcing cap is inserted within a first open end of each of the posts and frictionally engages the interior surface of the post to substantially prevent movement of the exterior surface thereof when various types of appurtenant structures are mounted thereon, which would otherwise cause deformation and possible structural failure of the post walls. First and second clips are inserted into the first and second open ends of the post, respectively, to provide an easy mechanism to properly space and secure the posts together.