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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6689
Experience:  Structural Engineer
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What size beam do I need 13 foot opening which will carry

Customer Question

What size beam do I need for a 13 foot opening which will carry the load of the ceiling joists and and one 2x4 which runs from the the valley rafter down and sits on the wall.
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.

Hello. How are you doing? I'll be happy to assist you.

Expert:  StructuralEng replied 1 year ago.

Will this support the attic only? What is the joist length on each side of the beam?

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

Where along the length does the roof post land?

Customer: replied 1 year ago.
it will support the attic and one valley that comes down from the roof. The lengths of the ceiling joists are 16' on one side and 12' on the other side
Customer: replied 1 year ago.
I'm in Toronto , Canada
Customer: replied 1 year ago.
the snow load requirements would be the same for northern states
Expert:  StructuralEng replied 1 year ago.

Where along the 13' span does the post land for the valley?

Customer: replied 1 year ago.
2'
Expert:  StructuralEng replied 1 year ago.

5.25" x 11.25" 2.0E LVL

Customer: replied 1 year ago.
the posts required to hold up the beam?
Customer: replied 1 year ago.
It's a 2x4 wall
Expert:  StructuralEng replied 1 year ago.

4x4 doug-fir no. 2.

Customer: replied 1 year ago.
3 LVL's at 1.75x11.25 to make up the beam
Customer: replied 1 year ago.
How is it that the width of the posts are smaller then the width of the beam
Expert:  StructuralEng replied 1 year ago.

That is not a problem as long as the beam is centered on the post.

Customer: replied 1 year ago.
the load that's penetrating down through the post needs to be transferred down to a single floor joist?
Expert:  StructuralEng replied 1 year ago.

No. That needs to go to a post and to a properly designed footing.

Customer: replied 1 year ago.
I have a beam in the floor running the same direction. As the LVL but two feet over. If I triple up the floor joists that run adjacent to the beam would it the post be able to sit on that ?
Expert:  StructuralEng replied 1 year ago.

I can't say for sure without knowing a lot more. I would triple it up and add a post below it directly below the post from the beam.

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.

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