With so much research coming out about the financial and dietary benefits of consuming locally grown food, the Riverstone Industries Monticello 8 x 20 ft. Premium Greenhouse Kit makes sense now more than ever. After all, there's nothing more local than your own backyard. This large greenhouse allows you to start a substantial crop early and even produce year round, so you won't have to settle for overpriced or chemically sprayed produce or flowers trucked in from states away. Good growing requires safe, sustainable ways to extend the growing season, and the commercial-grade materials of this greenhouse allow you to do just that.The Monticello Greenhouse by Riverstone Industries uses the highest-quality extruded aluminum available - over 85 lbs. more than an average imported greenhouse of this size Furthermore, it uses high-impact, UV-stable 8mm twin wall polycarbonate for the walls and roof, whereas most other greenhouses on the market use less expensive materials that they shave down as thin as .2mm. These extra measures of strength pay off by securing your greenhouse and all its precious contents from snow loads up to 24 pounds per square foot and from gusts of wind up to 113 miles per hour, making this far stronger than the average greenhouse. In addition to this obvious ability to hold up under strenuous natural conditions, these high-quality materials also make the greenhouse's growing potential more efficient, stretching the natural season longer and cutting down on electric bills for those looking to grow year round.As if top-quality materials weren't enough, Riverstone Industries has also equipped this premium package with a slew of features to help you make the most of your horticultural efforts. This greenhouse's workbench and sink - the only one found in the industry - will help you plan out your plantings and minimize your work time and effort. Its unique interior shade system will help you prevent sun scorching on more sensitive leaves and flowers, while the automatic roof vents will enable you to keep a good temperature and airflow. This greenhouse even comes equipped with gutters as part of its automatic watering system to help make the most of the elements that nature already provides. Even with all these features and commercial stability, Riverstone has made sure to keep assembly simple so that even an inexperienced builder can put this greenhouse together in less than a day, allowing you to jump right into your planting and production, which is the reason you bought it in the first place.Additional features:Features work bench systemIntegrated flush-base designHigh-impact, UV stable 8 mm twin polycarbonate walls and roofHeavy-duty extruded aluminum frameFour 2 x 2-ft. roof vents with automatic openersIntegrated dual rain water gutter systemPeak height: 90 inchesSidewall height: 58 inchesDoor dimensions: 48W x 68H in.Easy roll sliding entry doors with locking abilityExpandable in 4-ft. increments as needed (extensions sold separately)Efficient - average annual cost for year round operation is $175-$225Snow load capacity: 24lbs./sq. ft.Wind load capacity: 52m/sec. (113 mph gusts)Assembly time of approximately 12 hoursProudly made in the United StatesAbout Riverstone IndustriesRiverstone Industries prides itself on producing high-quality environmentally and economically conscientious products for the masses. They believe that their green product lines will enable everyone to help forge a brighter future for themselves and their world. By creating merchandise that is easy to assemble, backed by confident warranties, and supported by top-notch customer service, they have built and maintained outstanding quality that has resulted in customer satisfaction. Over the years, Riverstone Industries has also made a conscious effort to move its design and manufacturing programs to the United States, helping secure domestic jobs and a stronger economic environment.