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How to mate two pressure-treated 2x6s together?

I want to mate two 2x6s pressure-treated boards (span = 8') so that I can use them as a beam for my ground-level floating deck.

  1. Should I use a construction adhesive? Anything special given that the boards are pressure treated?

  2. What should I use: screws, bolts?

  3. What is the recommended spacing between screws? how many screws at each mark?

  4. Screw / bolt length?


[Edit] For clarification, by mating I mean joining them together such that two 2x6s become a single 4x6.