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-   -   UNloaded beam size for 20' span (http://www.diychatroom.com/f19/unloaded-beam-size-20-span-153585/)

tdfugate 08-13-2012 05:09 PM

UNloaded beam size for 20' span
 
I plan to erect an 18 foot by 20 foot pergola over my patio. The 18 foot span is between my house and my shop. I will uses PT 2x10s spaced 15" on center as joists between the two structures to provide partial shade. The joists will be attached and supported by the two structures. I intend to support the 2x10s with a pressure treated pine 4x12 or 4x14 central beam that will be supported by 6x6 posts 20' apart. I don't expect a live load (no snow here). Is a 4x12 or 4x14 Pressure treated Pine adequate for my central beam?


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