Once the footings have been poured, follow these steps to put up the posts and beams.
Once you've laid out for the footing holes, follow instructions to dig and pour the footings. Footings should be at least 2 inches above grade at all points; on a sloped site they'll stick up higher on the down side of the slope.
Keep things level, plumb, and straight
Take a little extra time to precisely align all the framing members. Double-check posts for plumb and adjust the braces if necessary. When using a mason's line to set a row of posts, keep the line about 1/8 inch away from the posts so the line stays straight. Framing members often get bumped during construction, so go back and check all the posts just before installing the beam, and check the beam just before installing the joists.
Two days with a helper to install posts, beams, and joists for a medium-size deck
Tape measure, hammer, drill, circular saw, handsaw, layout square, chalk line, post level, carpenter's level, mason's line
Measuring and cutting boards, checking for level and plumb, following a framing plan
Install the footings with J-bolts and allow the concrete to set; draw layout lines on the ledger and the header
Lumber for posts, beams, joists, blocking, and braces, 16d galvanized nails or 3-inch deck screws, joist hangers, hurricane ties
Install post anchors on the footings. The day before you set the posts, square one end, seal them, and cut them about a foot longer than needed. Install and brace the corner posts plumb in both directions, sealed end down. Align the line posts with the corner posts and brace them.
Make the beams longer than they need to be (you'll trim them later). Lay one 2x on top of another with the crowns facing the same direction and the cupped sides facing each other.
To keep the top edges flush, you may need to use clamps. Drive two or three 10d nails or 2-1/2-inch screws every 16 inches unless your building codes have specific fastening requirements.
In this deck plan one end of each beam is cut at a 45-degree angle. Cut only this end now; cut the other end after the joists are installed and the frame is squared. Set a circular saw at 45 degrees (test it for accuracy on a scrap). Using a layout square as a guide, cut through one of the boards. Flip the beam over. Use a square to mark the other board with the same angle. Complete the cut.