[look 171]

OK, that may work.

I just got my kids to do this as our covid project. Red Balau aka mangaures or Cumaru all come from same family as Mahogany only Red Balau is much harder but not near as hard as Ipe but a tad more then a dollar per lin. foot for a 5/4 x6" decking.

I over build everything almost all the time so my floor joist are 4x8 and half of the lower deck is 4x12 and the other is salvaged metal roofing truss from an industrial building. The span is over 17' and they run the length of the house. There's no bounce on both the lower deck and upper. As a matter of fact, I am going to try and finish up the hand railing after I get off the computer and pry the cold hands off the key boards from the games.

Edit

Ipe is a bit more then a buck per lin' compared to the others.

I also suggest using pressure treated especially up where you are, its always wet.