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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 is the recommended spacing for screws? how many on each mark?

  3. Screw length?