http://www.awc.org/calculators/span/calc/timbercalcstyle.asp?species=Alaska+Cedar&size=2x6&grade=Stud&member=Rafters+%28Roof+Live-Load%29&deflectionlimit=L%2F360&spacing=24&wet=Yes&incised=No&liveload=20&snowload=-1&deadload=20&submit=Calculate+Maximum+Horizontal+Span#answer
I'm not quite sure how to set all the adjustments, but it looks to me like 2x4's at 24 inch spacing would be very close to safety margins, if not beyond.
2x8's are probably too much...I doubt I could get builder to go there for such a small building, though they work exceptionally well for having vaulted ceiling.
2x6's seem to work nicely, and I think 2x6's at 16 inch spacing would be the kind of over-engineering I'd like to see.
I'm not quite sure how to set all the adjustments, but it looks to me like 2x4's at 24 inch spacing would be very close to safety margins, if not beyond.
2x8's are probably too much...I doubt I could get builder to go there for such a small building, though they work exceptionally well for having vaulted ceiling.
2x6's seem to work nicely, and I think 2x6's at 16 inch spacing would be the kind of over-engineering I'd like to see.
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