The construction team was just 2 guys - JR and JT. First order of work was to remove the old ledger board (holds the deck to the house foundation), cut away vinyl siding, and attach "flashing" to the house (keeps rain out).
I asked why (that's why I stayed outside for 2 whole days - to learn things). They do it because it is easy to slightly adjust the deck floor box square when it is still flexible. After the support posts are in cemtny, there's no changing things!
Forehead slap! Of course. And because we had talked a little carpentry, they asked if I knew how to make sure the box was square. I said "sure, measure the diagonals". I got a "high-five" (and a little casual respect) for that one!
See, the outside measurements of the deck box have to be 16' exactly. So the senior guy (JR) had of course deducted the thickness of the end cap when he cut the joists to fit inside the box. But forgot to deduct the thickness of the ledger board! LOL! Oh did he catch flak for THAT from JT. And I got in a couple of friendly-kidding remarks later about that, which he took in good humour.
So here are most of the joists in place (I had to keep reminding myself; take pictures, take pictures).
The corner of my brain where my "Learned From Dad" experiences reside are all screaming "this is all bass-ackwards", but what I'm observing says "outside your box, watch and learn"! So I shushed the Dad Corner and learned...
I also loved the screws. In the old days, there were just straight-slot screw-heads. Then there were Phillip-Heads (an X). Then there were square heads (which I use myself), then star-shaped and even "tork" which has 7 or 8 sides. All the harder to slip the driver of the screw. The guys use star heads. But it this gaget that makes things so much easier.
Still, I may add "sisters" (additional boards screwed to the sides of the preforms) the later. But 4 of those only a foot apart does look pretty sturdy.