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Is using treated 5/4 decking going to be okay with 16" o.c. 2 x 10 joist with 12 ft span
It will be fine as long as you're installing it perpendicular to the joists. Diagonally installed 5/4" would need 12" on center.
 

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OK, if the treated 5/4 is new(green) make sure you butt them tight against one another when screwing them down because you will have shrinkage and you Will end up with a 1/8 to 1/4 inch gap any way. A lot of people will tell you to space the apart don't do it they will shrink and your gap will be unsightly.
 

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Discussion Starter · #4 ·
My deck

I am building a deck all treated. Using. 2 x 10 x 16 as beams and joist with 12 ft span deck is 16.x 16 with 3 6 x 6 under each beam for supports. Would using 6 x 6 for the hand railing post be to much weight if I have them every four foot around the perimeter???
 

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I am building a deck all treated. Using. 2 x 10 x 16 as beams and joist with 12 ft span deck is 16.x 16 with 3 6 x 6 under each beam for supports. Would using 6 x 6 for the hand railing post be to much weight if I have them every four foot around the perimeter???
If the deck is built correctly, you'll have no issue with the weight.
The visual ascetics are another matter. A 6x6 every 4' is a mass of wood.
 
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