Feb 24, 2017 · For instance, 1 mil to 6 mil "construction grade" polyethylene sheeting in the nstruction aisle is the lowest grade of polyethylene sheeting available on the market. It is made from up to 25% post nsumer recycled goods, reground resins, and the HENAN OKAYolute least expensive resins that can be bought from any source in any location across the globe.