I just built a large deck 24' x 27'. Priced SS screws - astronomical price - went with the ceramic coated. I couldn't imagine trying to screw boards in from the underside. We had a hell of a time getting the 2 x 6 boards straight using spacers and pry bars and then screwing them down, to add the effort of screwing them from the underside makes the job considerably more difficult IMO, in any case large parts of my new deck are not accessible from the underside. Boards were laid bark side on top so that boards cup downwards and water does not make a trough, 5 months later most boards now have a very slight cup, since they dont dam the water it's not noticible. I have no experience with anything other than treated SYP for wood.

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