Foundation: 8x8 CMU, set just below floor grade, with cast-in-place Unistrut "Telestrut", inside of which Frame posts will be fastened;
Frames: Use "Unistrut" 1-5/8" channels for posts and rail frames, and 1-1/4" channels for "purlins" under trays; Use 4"dia and 2"dia steel pipe slices (1" slice length) as frame stiffeners as shown, fastened to Unistrut frames with standard Unistrut spring nuts and bolts, and rings fastened to each other with welds or short 1/2" dia bolts, one per connection;
Trays: To dimensions shown and 4" tall, make trays from CDX Plywood, 5/8" thick sides and 3/4" thick bottoms, with two or four 1/2" dia holes drilled through plywood as liner leak indicators, evenly spaced in tray bottoms, and liner-lined 3" dia drain for water flow to the tray or tank below; Mount trays to Unistrut purlins as shown, and set purlins of lower tray on frame without fasteners. Mount purlins of upper tray to frame with Unistrut #P2749 single-axis wheel trolleys, so that the upper tray can be rolled to the front for plant maintenance and back to the rear for growing. Trays to be lined with food-grade waterproof liner ( suggested vendor http://www.aquaponics.com/ )
Download complete Unistrut Catalog: http://www.unistrut.com/DB/PDF1/Unistrut_16-Catalog.pdf
( Irrigation pumps, Aeration fountains and tank heaters and thermostats to be specified)
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