Just a quick note from my experience. You may find the pressure treated 1x4 wants to curl and twist. I would use pressure treated only where it is going to be in contact with the soil or moisture, for long periods of time. I see lots of people use it for decking and in no time the boards twist so much that they break off the heads of the screws. Using it for the joists might not be a bad idea- probably don't have to as you are going to use boards for the deck- there will be spaces in between for the water to run out. Just my two cents worth.
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