34 that is attachable to the bracket 32 the trim 34 includes a first and second outer face surface 60 62 a first and second hidden surface 64 66 facing the building and a cutout 68 70 on each side of the trim piece proximate the first and second hidden surfaces the cutouts 68 70 are comprised of overhangs 72 74 that serve to shield the potentially rough cut edges 15 of the siding panels 13 from view by an onlooker the overhangs 72 74 are preferably no thicker than 0 25 inches and extend no further than 0 75 inches from the cutout face surfaces 76 78 fig2 also reveals at least one longitudinally extending slot 80 82 disposed within each of the first and second trim piece hidden face surfaces 64 66 for receiving the at least one flange 46 48 extending outwardly from the outboard ends 40 42 of the first and second orthogonally disposed panel elements 36 38 the flanges 46 48 are preferably canted away from the plane of the panel elements 36 38 at an angle in the range of from 120 to 150 degrees and preferably at 135 degrees the bracket 32 may optionally include a weather strip 50 52 that extends outwardly from the hidden surfaces facing the structure 64 66 the weather stripping 50 52 serves to prevent the intrusion of moisture beneath the siding panels 13 or trim piece 34 and are flexible yet resilient the weather stripping 50 52 may optionally be secured to the trim 34 with an adhesive.