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StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7003
Experience:  Structural Engineer
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What is the maximum span 4' x 10' beam, supported by just 2

Customer Question

Hi - what is the maximum span for a 4' x 10' beam, supported by just 2 posts (4 x 4's or should they be 4 x 6's? 2 posts meaning there would not be a center vertical post) -- that will support a 2:12 pitch non-insulated roof, that is approximately 16-18' wide (for a carport)? I'd use Simpson brackets, plus there would be 45' angle braces on all 4 'corners' (2 per corner of each rectangle). Is the max span the same for glulam vs. a douglas fir beam vs. a steel beam, and if not, what are the max spans for each of the 3?
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.


Expert:  StructuralEng replied 1 year ago.

What is the city and state so I can look at snow loading?

Customer: replied 1 year ago.
Sorry - state of California, Central, no snow, and no rains for 4 years!
Expert:  StructuralEng replied 1 year ago.

9'. I assumed doug-fir no. 2 pressure treated.

A glulam would be a little better. Steel would depend on exactly which size beam.

Expert:  StructuralEng replied 1 year ago.

Hello. Do you have any other questions on this topic? If you could rate my answer, I would appreciate it.

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