I am building an 8' x 12' greenhouse on the hill after asking a lot of folks for advice last year on the creek. It's less than 120 square feet and an accessory building so no permit/codes are needed. They don't seem to care if we use it as a shed or greenhouse as long as it's not a living space thing. Anyway, the plans aren't written down, just in my mind. Threw this together today out of 2 x4 walls and a 2 x 12 double ridge beam with 2 x 10 rafters. The slots in the roof are for three skylights an those have additional rafters. Used double 2 x 6 collar ties in the center rafters about 4' apart and a single on each end as a collar tie. The neighbor's wife wants to know if I can "beef it up" so it doesn't blow away. Everything is on 16" centers. Hurricane clips were also used. In her defense, a neighbor's Harbor Freight greenhouse blew into another neighbor's driveway last year. Is this one build solid enough?
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