ledger strip

ledger strip

1. On a beam which carries joists flush with the upper edge of the beam (or girder), a strip of lumber which is nailed to the side of the beam (along its bottom edge), forming a seat for the joists and helping to support them.
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NAME 3/4" PLYWOOD A 4 Outside sides B 4 Outside tops and bottoms C 4 Outside shelves D 4 Outside hanging and filler strips E 2 Bracket hanging cleat F 2 Center sides G 2 Center top and bottom H 2 Center dividers J 3 Center shelves K 2 Center hanging and filler strips L 1 Center ledger strip M 1 Center light valance BOARDS AND MOLDING N 4 Brackets P 7 Cap Q 7 Cove molding
Your drawing will also give you the size of the ledger strip used to install the shelf.
Put the unit on the ledger strip (the batten of wood fixed on the wall you're using to help take the weight of the units) and 6mm away from the reference line on the wall.
If your deck was constructed without joist hangers, install them using 16d galvanized nails to secure them to the ledger strips and beams, and special galvanized stubby nails to the joists.