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.
Should I use a construction adhesive? Anything special given that the boards are pressure treated?
What should I use: screws, bolts?
What is the recommended spacing between screws? how many screws at each mark?
Screw / bolt length?
[Edit] For clarification, by mating I mean side-by-side e.g.joining them together such that two 2x6s become a single 4x6.