Pergola Beam Span Table. The species of lumber, size of lumber and the load it carries. I live in colorado so wind and snow loadings are in effect. Thanks for any information you can provide.

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1) refer to general notes for information that is relevant for all span tables. I am looking for plans and or prints to build a 20 x 20 pergola in my back yard, most of the ones i see are for smaller design. The species of lumber, size of lumber and the load it carries.

Wood framing tables can contain a lot of information in one table.

Deck beam & header span chart. If i need a beam to span 13~14', will a pair of 2x8s sandwiched around the posts be sufficient? We've got instructions and examples to show you how to space rafters when the numbers don't make it easy, when to use an even number of rafters and when to use an odd number, when to start your spacing with a rafter in the very center of the roof. In a pergola application can a 2 x 8 x 8′ joist spaced 24″ on center support the load of 2 x 4 boards placed on top of the 2 x 8 spaced 12″ on center. Keep in mind that these are minimums for the spacing indicated—you can select larger sizes to handle excessive loads. Next, calculate beam placements and how best to coordinate them with the rafters. You can also use the wood beam calculator from the american wood. 2) * denotes 600 mm rafter spacing only.