The posts and frame for the landing and stairs are pressure treated and just needed joist hangers under the deck. I replaced the risers with PVC trimboard and the treads with Centurion Paramount PVC decking. In order to get the correct rail heights, I screwed 4" x 4" pressure treated blocks to the tops of the posts and covered the joints with trim.
I build to the DCA-6 Prescriptive Residential Deck Construction Guidelines. This deck has Fiberon Paramount PVC decking, Tiger Claw TC-G Hidden deck fasteners, Royal S4S PVC trimboards and treated railings with black aluminum balusters.
I receive this cry for help quite often. The old growth pine on the historic houses for which Ipswich is famous is very durable, but much of the finger-jointed farm-grown pine on new houses begins to rot almost as soon as it goes up.