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Can you support a 20ft 2x6 only at the ends for a pergola?

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2x6 DF #2 Supported o the ends can handle about 11 lb. per Ln. Ft. total load. This would include snow. would recommend at least 2x8 if you are okay with sagging from wood creep after many years. 4x8, (2) 2x8, or 2x10 would be better.

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You can, but much of any load on it (plants, crossbars, etc. for a typical pergola) will probably break it.

  • Or cause it to droop significantly even if it doesn't break. Remember, wood is flexible. If you must do this long an usupported span i'd suggest either something heavier or manufactured-lumber structures like wood I-beams. – keshlam Apr 28 '15 at 21:31
  • @keshlam A pergola built with wood I-beams, might look a bit strange. – Tester101 Apr 28 '15 at 22:12
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    @Tester101 Not if you wrap them with nice cedar planks. – bib Apr 28 '15 at 22:13

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