On Thursday, July 19, 2018 at 8:47:21 PM UTC-4, Ed Pawlowski wrote:
On 7/19/2018 6:44 PM, Terry wrote:
replying to trader4, Terry wrote:
Im building a pergola , how far can I span with a 2x8 treated beam.
Needing
to be 14.

With no load you can go pretty far. It only has to support itself on a
pergola. You will be good for 14'

Yes and if he googles for floor loading calculator, joist calculator,
beam calculator there are tools online that will give you the various
options depending on the load, span, spacing, type of lumber