The Riverstone Industries Monticello 8 x 8 ft. Greenhouse is terrific for growing all kinds of things, including a green thumb. By stabilizing some of the variables nature tries to throw at you, you can create a more conducive atmosphere for developing your growing techniques. No longer will an unexpected late frost dash your springtime efforts before you can see the fruits of your labors. Even after learning the ropes, this greenhouse makes for an indispensable gardening tool, allowing you to start your growing early and even produce year round, providing safe, sustainable ways to extend the growing season. The Monticello Greenhouse by Riverstone Industries uses the highest-quality extruded aluminum available - over 40 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 stretch as thin as .2mm. Riverstone"s 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 its 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. Not only does Riverstone Industries use the highest grade materials on these greenhouses, they also construct them with features designed to help you make the most of your horticultural efforts. The automatic roof vents will enable you to keep a good temperature and airflow, while the dual integrated rain water gutter system helps you make the most of the elements that nature already provides. And Riverstone hasn"t forgotten to keep assembly simple, so even an inexperienced builder doesn"t have to waste a whole weekend putting this greenhouse together. In less than a day, you"ll be able to jump right into your planting and production, which is the reason you bought it in the first place. Additional features: * High-impact, UV stable 8 mm twin polycarbonate walls and roof * Heavy-duty extruded aluminum frame * Easy, fast assembly even for inexperienced builders * Assembly time of approximately 4 hours * Peak height: 90 inches * Sidewall height: 58 inches * Door dimensions: 48W x 68H in. * ""Easy roll"" sliding entry doors with locking ability * 2 x 2 ft. roof vent with automatic opener * Expandable in 4-ft. increments as needed (extensions sold separately) * Efficient - average annual cost for year round operation is $100-$150 * Snow load capacity: 24lbs./sq. ft. * Wind load capacity: 52m/sec. (113 mph gusts) * Proudly made in the United States About Riverstone Industries Riverstone 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 manufactur