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Hey guys. I am looking to add a pergola to our recently expanded patio. (picture below)The dimensions of the patio are 14.5'x16.5'. We received a couple quotes to have the pergola built but they were astronomically high so now have decided to build it myself. Have quite a few questions and hoping to get feedback as I have done a few minor building projects but nothing this big. I'm just going to explain what I have envisioned and am open to all suggestions, see the last photo below as I plan on making a replica of this pergola but on a larger scale.

I decided that it would be easier for me to build the pergola free standing instead of attaching it to the house with a ledger. The size of the pergola will be 13x15 using four 6x6 posts that will be anchored drilling holes into the existing concrete and using saddle brackets. (Are saddle brackets the best option to secure the posts to the existing concrete?) I then plan on using (3) 2x10x16 beams to span the 15' distance (my wife really doesn't want a middle post), plan to secure the beams using a beam connector. (Will 2x10's be strong enough to hold the weight without sagging? Should I use 2x12's? How should I secure the beams "on top" of the posts as in the picture below? Would beam connectors work? Should I reconsider securing the beams to the sides of the posts?). I then plan on using 2x6x14 for the rafters spaced 14" apart securing with angle brackets. Finally I will use 2x2 for the battens spaced approximately 2" apart. Will this be structurally sound? Looking forward to your feedback. Thanks!
 

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retired framer
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I would not trust anchoring posts to a poured slab. I'd cut out 6x6 holes for the posts, using a 4" angle grinder and excavate by hand for longers posts with poured concrete over gravel. PITA I know but ...
 

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The issue I see with pergola pictured is no angle bracing. It is going to be wobbly. If the post was notched and beam set and bolted that would help a bunch.
 

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I was skeptical of using attaching beams using holder but have read reviews of a couple heavy duty post holders and other seem to be pleased with the result. Anyone have any first hand experience with this?
 
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