framing and decking

I am installing Doug fir for my decking and have been told to hold each board tight with no gap. Then when the lumber dries out there will be about a 1/4" gap...

My concern is that in the winter the wet weather will swell the boards and they will be touching again holding the moisture and causing rot...

Also in securing the boards with two screws on each joist will that cause the boards to split in the center by not allowing them to shrink inward as they dry?

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