One advantage of using the cement footings and the wood attached to them above ground, is the leveling and exact location can be set later, when the beams are positioned. Step 5 Secure beams to posts. Using a string and level, find the desired deck floor height on the posts. Or extend a long straight 2 by 4 from the ledger board to the posts and placing a level on the board, determine the post height. Carefully mark all 4 sides of the posts.
Beams can rest on top of the post, or be fastened to the side.
You may cut all posts except those serving as railing supports at this time. Fasten the beam to the post, keeping post and beam flush. Or set the beam atop the post nailing it down to the post. Step 6 Attach joists. Joists can be attached to the beams using joist hangers, or rest on the beam.