[dad911]

Originally Posted by 5495bb

I like to put some innovation into all my work so I really want to try the composite but I don't think I'll be able to. All the framing is based on lumber 5 1/2" (5 3/4 " gapped) widths, the composite I'd be using (Fiberon) is just 5 3/16" (5 3/8" gapped). ........

Don't overthink the board width, start on the outside and put a rip by the house if needed.

Originally Posted by gregpark

Composite decking will work just fine. Double up your joists and cap them all with paper. Add lots of blocking and maybe sister on a rim joist if needed at the end. Check the health of the existing joists at the house with a screwdriver, they look suspect. I would also add a beam across the middle while it's open. It'll feel way more solid

This.

While the decking is off, it would be a good idea to make sure grade pitches away from the house, and maybe put down some plastic and stone.