If you're looking for supreme coverage for your greenhouse or patio enclosure, turn to the wonderfully versatile and durable 18' x 20' heavy-duty premium clear poly tarp from Tarp Surplus. This tear-resistant tarp features a 14 x 14 mesh count, six ounces per square yard along with ½" x ½" reinforced fiber. The water- and rot-proof clear poly tarp is fashioned from a three-ply material that is constructed from 14 mil of polyethylene. Grommets are strategically placed every 36 inches and reinforced plastic corners and heat-sealed seams make for a secure installation that can withstand even Mother Nature's worst. The clear tarp is UV treated, so it will protect delicate plants from the harmful effects of the sun's rays while still allowing a healthy amount of sunshine to flow through. The 18' x 20' clear poly tarp has a finished size of 17'6" x 19'6".