If you've always wanted a backyard greenhouse, don't give up on the idea. It's actually a feasible do-it-yourself project with a 40' x 40' heavy-duty premium clear poly tarp from Tarp Surplus. Our durable three-ply poly tarp features a 14 x 14 mesh count and 14 mil polyethylene. With heat-sealed seams, reinforced plastic corners and grommets strategically placed every 36", installing the premium tarp is a simple process. The UV treated tarp fabric lets a healthy amount of light in to allow delicate plants and blossoms to grow and prosper while blocking out the sun's harmful rays. Each clear poly tarp is tear-resistant and offers artic flexibility, making them the ideal seasonal choice for greenhouses and patio enclosures. The premium clear tarps are rot resistant and waterproof as well, providing top of the line protection from the Mother Nature. Finished tarps are slightly smaller therefore it's important to measure prior to ordering. The 40' x 40' clear poly tarp has a finished size of 39'6" x 39'6".