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3

Use 2x material... it's probably cheaper, stronger, and gives you more surface to screw into. (edit: this was based on the original question -- 'use 1x or 2x material?') 1/2" ply would probably be fine, but I'd suggest you upgrade to at least 5/8" ply (or whatever the horrible version of that is in the box stores -- 19/32"?!?) to skin the exterior. ...


2

Unless height is an issue, why limit yourself to a 6" deep timber? It's the height that's going to give the beam its rigidity. Why not look at an 8" or 9" deep floor joists? We use 9" x 2" and even 9" x 3" floor joists all the time. Although, the last bridge we made (over a stream to a rough old fishing pond so aesthetics wasn't an issue) we used 'open ...



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