[JJ0805]

Do I need to use 6x6 pressure treated posts over 4x4 pressure treated post. The footing is 5ft apart. It's a raised deck. The deck is 12ft from the house and 20ft in length. There is only 2 beams holding up the joists at the moment so I'm aiming for the 4x4s

 

[carpdad]

4x4 treated tend to twist and split more, so even if you're allowed, it's better to use 6x6.