Structural integrity of new fence on concrete slab

anchorfenceframingstructural

I recently bought a condo with a 11'x13' patio with a wooden privacy fence. The fence is in pretty bad shape so I want redo it with new wood in a more modern design by doing horizontal planks. I posted another question about materials (Rebuilding fence – lumber questions) and from that discussion now have questions about the structural integrity of my design. I sketched out the existing framing and proposed framing with an sky view and front view.

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The main difference is that I will be increasing the size of the corner posts to 6×6 so that I can screw the horizontal planks to the framing and the post will still stick out of it. Something like (https://i.pinimg.com/originals/8c/e8/d4/8ce8d43018c740fb1c6b47f8a6a369d8.jpg). I also want to add a 4×6 post in the middle of each side to break up the long stretch of horizontal planks.

Is this plan sound? I am open to all suggestions, thanks in advance!

Best Answer

You aren't clear on how the posts are anchored. Are you pouring concrete piers or doing metal mounting plates with concrete anchors? Either way, I think your plan is sound but you should also anchor the center posts which are floating in your current plan. That will add considerably more structural integrity to your fencing.
I like the 6x6 posts for strength and aesthetics.