Don't give up on having a backyard greenhouse. Make that dream come true with a 30' x 40' heavy-duty premium clear poly tarp from Tarp Surplus. Each hardy three-ply tarp features a 14 x 14 mesh count and 14 mil polyethylene. Thanks to heat-sealed seams, reinforced plastic corners and grommets strategically placed every 36", installation is a stress-free process. The UV treated tarp fabric lets a healthy amount of light in to allow plants to flourish while blocking the harmful rays. Our clear poly tarps are tear-resistant and offer artic flexibility, making them the perfect year-round pick for greenhouses and patio enclosures. The premium clear tarps are also rot and waterproof, giving top notch safeguarding from the elements. Finished tarps are slightly smaller, so be sure to measure. The 30' x 40' clear poly tarp has a finished size of 29'6" x 39'6".