Deck Beam Question

Should be using 6 X 6 post not 4 X 6.
Tried going to a real lumber yard to get longer lumber?
I have two close by that I can get up to 24' long 2 X 10's.
Why the odd ball length.
Make it 20' and you will have a whole lot less waste.
Building it this way is a lot faster because there's no notching needed.
https://www.google.com/search?q=dec...ch&q=deck+beam+splicing&imgrc=zD0B3oNOQ08M4M:
Here's an article that may help showing the 10 most common mistakes made when building a deck.
http://www.finehomebuilding.com/how-to/articles/top-10-deck-building-mistakes.aspx

4x4 posts may work. Compare your tributary load (example sited) to check if under maximum stated height allowed per chart, 3/4 down-scoll this; http://www.awc.org/pdf/codes-standards/publications/dca/AWC-DCA62012-DeckGuide-1405.pdf

Gary

The 19' span will have the beam spanning about 10'. That may not pass. I'm in NJ and for double 2x10 pt beam, nailed then bolted, I need 8' o.c. supports. The lumber joints must fall on the supports.