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Discussion Starter #1
It's a plan for a trellis like the image, to stand over 16' planter. View is going to be a factor and a middle pole may be rejected.:smile: So the span may be 20' or so. For the upper piece, would you check my numbers?
Using the calculator, I used following inputs and got a span of 18.5':
douglas fir-larch (north) - if I can get 20-22' lumbers from yards in NJ
2x8 - I can use 2x10 but prefer thinner look
ceiling joists - obviously will have no drywall or insulation, etc
L/180 - assuming the no load, therefore, least resistance to deflection
24" spacing - I had to input something, but no spacing
NO on exterior exposure - just pretending this doesn't count
10 psf live load - had to input something but no live load, except maybe birds
5 psf dead load - assuming this suffices for the lumber itself.

I can fumble with the regular construction spans, but to find the span capacity of just the lumber itself, how? Thanks in advance.

Super Moderator
21,106 Posts
Seeing as it will be supporting virtually nothing, any size lumber should work fine structurally.
Use what makes the look you want.
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