Azek PVC deck boards with Joist Tape

I've never noticed that before, but Home Depot sources their lumber from different mills, so they may vary slightly from batch to batch. It may also even out a bit as the wood dries.

One thing I did find, at least in my area, is that the 5/4 deck boards from Home Depot are significantly different than the ones at Lowes. The Lowes ones are slightly narrower but a bit thicker and the depot ones are thinner but slightly wider. Was very annoying when I got some boards from one place and more later from another only to find that they weren't really the same dimensions.

Move the deck to the right, so that all main beams are continuous (move it up, to similarly simplify the notch-out, if possible). It'd make construction much easier and need less piles (especially some of those piles that would be adjacent to a tree; roots).

Red lines= entire deck moved to the right to make the beam that hits the center cutout, continuous

Blue circles= guesses as to where you need piles (assuming it's moved over to the right)

Blue line= doubled up joist to help take the weight of the notch (may or may not be necessary here, also possibly needed for the four two joists that [will] support the center cutout)

Extend the beams all the way through the triangle at the bottom, straight through its hypotenuse to the tip; one less pile there. The joist that supports that end of the triangle out in the middle of nowhere (above the 1347mm note), should probably also be doubled up.

I see no reason to double up those joists in the center, running left to right, unless that's where you're going to have a continuous seam in the decking and want them there to make the decking installation easier.

See here for how to build a deck that will last longer than your house:

2011 Porch Guide -cityofchicago.org