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Fastening Deck Boards to Joists - Weakening Joists?

So I've already attached a few deck boards by drilling pocket holes into the joists and securing with weather resistant screws.  It strikes me that I'm removing a fair amount of wood.  How badly am I weakening the structural integrity of my joists?

 

It's a small deck, 2x6 joists on 20" centers spanning about 5'.  Is this a big no no, or am I ok?

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Depends on how many you are using. I would think one on each edge of the deck board on alternating sides of the joist would be fine.

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