Polymeric structural panel

摘要

A polymeric twin wall board which includes a first substantially planar sheet forming the upper side of the board, a second substantially planar sheet forming the underside of the board and a plurality of spaced longitudinally extending webs connecting the first substantially planar sheet to the second substantially planar sheet wherein the difference between the level of the top surface of the first substantially planar sheet adjacent to its juncture with any of the longitudinally extending webs and the level of the top surface of the first substantially planar sheet intermediate any of the adjacent longitudinally extending webs is no more than about 1% of the average distance between adjacent longitudinally extending webs.