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I had to beef up the roof structure significantly. Doubled up collar ties and posted vertically 2' on center. The garden calcs out to 7,000 lb.s wet. The planting medium is 50/50 Perlite and Peet moss, 2 yards worth. Plants are all Sedum succulent. A lot of research went in to what is necessary for everything, drainage and filters, land slides, auto sprinklers, etc. PITA but we love it.
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