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StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7320
Experience:  Structural Engineer
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I have a 13' 6" clear span and plan on using a 12 x 12 fir

Customer Question

I have a 13' 6" clear span and plan on using a 12 x 12 doug fir rs beam. It is only supporting a porch roof that is 13' wide. The porch ceiling is 1x6 T&G and the roof is a 4:12 pitch. Is the 12 x 12 adequate?
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.

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

Customer: replied 1 year ago.
San Antonio, TX. No snow here.
Customer: replied 1 year ago.
Expert:  StructuralEng replied 1 year ago.

Yes, that 12x12 is adequate as long as it's a hem-fir no. 2 or better

Customer: replied 1 year ago.
I have talked to several lumber companies as well as a truss designer and none suggested hem-fir. All felt that 12 x 12 doug fir #1 was more than adequate. In fact one lumber company is running the numbers on a 6 x 12 doug fir #1 beam. Do you still think hem-fir is needed? I was also told that doug-fir is stronger than hem-fir. What is your opinion?
Expert:  StructuralEng replied 1 year ago.

Doug-fir is stronger than hem-fir. I didn't want to tell you Doug-fir and have hem-for be the only available lumber to you. If hem-for is acceptable then almost any other species and grade combination will work

Expert:  StructuralEng replied 1 year ago.

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