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Place a mark in the center of the box sill. This will be the location of the center beam.
Note: Before you start deck construction, you should set up a temporary worktable. For that, you'll need a couple of sawhorses, which can be built out of scrap lumber.
Dig footers and pour with concrete. Be sure to check with a local engineer to check the different sizes and weights of footers for the particular deck. Depending on what you plan to have on the deck (a hot tub, for example), the size of the footers will vary.
Cut a piece of 2x8 lumber the width of the deck and nail it into the box sill against the house. Then, on the other end, temporarily support the beam using a scrap piece of lumber (Image 1) and get the beam level (Image 2). Mark the joist locations every 16 inches. Cut joists to length and mark the joist locations along the box sill and beam (Image 3).
Before installing and nailing the joists, make sure they are flush with the beam. Install the joists using a pneumatic nail gun and then later install joist hangers.
Note: Before installing a joist, check for crowning (wood either has a natural arch or dip) and install boards with the arch facing up.
Tip: Be sure to have a good level to do this job. The longer the level, the truer the readings.
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