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Install the band joist. The band joist, also called a rim joist, sits vertically on top of the sill plate. Use the same size lumber for the band joist as you will for the main floor joists; 2x10s (50x250 mm) are an appropriate size for most applications. Position each board vertically so that its edge is flush with the outer edge of the sill plate, and then toe-nail the board to the sill plate with framing nails.
The minimum size joist to be used in deck construction is not a stand-alone consideration, and is related to the number of footings and beams that will be installed. In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists. In typical deck construction, with a ledger on one side of the joist and beam on the other, the size of the joists is driven by the size of the deck based on the general maximum spans mentioned above.