Kreg Jig Deck Kit

I've just been looking at the Kreg Deck jig being advertised on Lee Valley's website. http://www.leevalley.com/en/wood/page.aspx?pe628&catQ&ap=1
I was wondering about fastening deck boards as demonstrated by this jig. For those of you experienced with building decks, would the screws need to be inserted on both sides of a deck board, (assuming there's just enough room for screws to be inserted on a 45 degree angle both edges) or just on one edge? And if it is just one edge for fastening down a deck board, wouldn't there be a tendency for the opposite unfastened edge to rise or perhaps cup over time?
Thanks
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wrote:

This web page.
http://www.kregtool.com/Deck-Jig-Prodview.html
Has a video showing installing screws on the inside of the deck board, at about the 27 second mark, as well as the outside. Also has a link to the printed guide included with the jig, which shows the screws installed on both sides.
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