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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6746
Experience:  Structural Engineer
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We want to open up our floor plan. The length of the house

Customer Question

We want to open up our floor plan. The length of the house us 32 feet. What Size lumber do we need to build a beam to support the ceiling, held up in four spots by 4x6's?
Submitted: 1 year ago.
Category: Structural Engineering
Customer: replied 1 year ago.
The house is in Minnesota and it is a load bearing wall. Also how do we connect it to the posts and end walls?
Customer: replied 1 year ago.
We do want to use dimetional lumber. And need the design to meet building code.
Expert:  StructuralEng replied 1 year ago.

Hello. I can help. Can I get back to you in a couple hours?

Expert:  StructuralEng replied 1 year ago.

What will we the span of the beam between posts? What is the joist length on each side of the beam? Will it support the attic joists only and no floors or the roof?

Customer: replied 1 year ago.
There is no second floor, so just the rafters and roof are supported. The house is only 24 feet wide and 32' long, so the rafters are 24' plus about a 2' overhang. We wanted to have the center beam supported at both ends and two spaced in between.
Expert:  StructuralEng replied 1 year ago.

Thank you for the additional information.

Is this a flat roof or a gabled roof?

What is the city in Minnesota so I can determine the snow loading?

Customer: replied 1 year ago.
The pitch is 4/12 and it's Hibbing, MN
Expert:  StructuralEng replied 1 year ago.

Thank you. I'm sizing the beam now

Expert:  StructuralEng replied 1 year ago.

You would need 4 - 2x12 to span 11' between posts supporting the 60 psf snow load.

Customer: replied 1 year ago.
There are only 3- 2x8's put together for the main beam under the floor joists. The beam rests on the foundation wall at the ends and has two floor Jacks in between. It doesn't make sense that we'd have to jump to 4-2x12 to just hold up the roof. Why?
Expert:  StructuralEng replied 1 year ago.

A 60 PDF snow load is heavy and dimension lumber is not strong

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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