A good friend had a deck that had a rotting sub-structure beneath some fairly original Trex decking that seemed in reasonable shape, though most Trex decking from that era had been recalled due to flaking. But the rotting underlying substructure was causing the deck surface to undulate in a way that was becoming quite dangerous. Sorry, I have no picture of the “before” deck.
I really should spend some time getting "before" starting demolition. This was a tricky job because to save money we salvaged all of the existing decking, which is already cut to exactly the right shape. Therefore, we cut the decking off the rotting substructure and placed it in order on the lawn while we rebuilt the substructure. Wish I had a picture of that too.
Plus we added a built-in bench on the south end. Here is the structure beneath the seat.
Plus we replaced the original bench surfaces after sturdifying the posts. Solid, 3 feet deep into concrete.
Deck and benches complete.