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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6681
Experience:  Structural Engineer
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I am having my basement finished. I currently have 9.5 x 5.5

Customer Question

I am having my basement finished. I currently have 9.5 x 5.5 supports. There are 4 lolly columns in between every 6 feet to support that. The room is 25x25. I have a kitchen above that and above the kitchen is a large deck. what size steel I beam do I use...size and pounds per square foot?
Submitted: 1 year ago.
Category: Structural Engineering
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 1 year ago.
I have three of the 9.5 by 5.5 supports.
Expert:  StructuralEng replied 1 year ago.

Hello, how are you doing? I'll be happy to assist you. Do you still want a phone call?

Customer: replied 1 year ago.
please,(###) ###-####
Expert:  StructuralEng replied 1 year ago.

I will submit that additional service offer for the phone call. If you accept before 10:30 pm EST, I will call tonight. If it's after 10:30 pm EST, I will call in the morning.

Customer: replied 1 year ago.
No, thank you. Could you just answer the question. Thanks
Expert:  StructuralEng replied 1 year ago.

Do you want a shallow steel beam with the same supports or do you want to remove supports?

Expert:  StructuralEng replied 1 year ago.

Is there any ceramic tile?

Customer: replied 1 year ago.
No, we are going to pour concrete
Customer: replied 1 year ago.
We want to remove the supports
Expert:  StructuralEng replied 1 year ago.

So you want the beam to clear span 25'?

And the floor is going to be concrete?

Customer: replied 1 year ago.
we have a 25 foot spam with the lolly columns. I want it to be low profile and sandwiched. what kind of I beams do I use to support it. Could i use lbl with metal insides..will that be sufficient to support the house?
Expert:  StructuralEng replied 1 year ago.

The lowest profile you will get will be a steel I beam. A flitch plate beam will be much heavier and less efficient.

Customer: replied 1 year ago.
Im not sure what a flitch plate beam is. I was told by a freind that LBL works well, but I am not sure. If I go with the steel I beams what size do I go with?
Expert:  StructuralEng replied 1 year ago.

An LVL works well, but it will be VERY deep to span 25'

Expert:  StructuralEng replied 1 year ago.

Supporting just a single floor, you will need a 5.25" x 18" 2.2E LVL to just barely work for L/240 total load deflection.

A steel beam would be a W10x39 or W12x30. The first is 10" deep and the second is 12" deep. The steel beams require the joists to be detailed to brace the beam against lateral torsional buckling.

Customer: replied 1 year ago.
I am sorry but could you elaborate on what you mean by VERY deep. I am not a contractor, I am just gathering information for my husband who unfortunately is at work right now. I am going by the details he has given me, i apologize.
Customer: replied 1 year ago.
could you please dummy it down for me. Thank you, ***** ***** apologize again. What he has told me is that our basement currently has 9.5 by 5.5 supports. There are 4 lolli columns in between every 6 feet to support that. The room is 25by 25. We are having concrete poured-right now it is a dirt floor. On the first floor of the house, I have a large kitchen. Above that on the second floor, There is a large deck. What size I beams do I use...size and pounds per square foot.
Expert:  StructuralEng replied 1 year ago.

Very deep is the 18" I listed in the size immediately following that sentence.

Expert:  StructuralEng replied 1 year ago.

Oh, it's supporting two floors, not just the one? That will require a bigger beam.

Expert:  StructuralEng replied 1 year ago.

You will need a 7" x 24" 1.8E LVL to limit total load deflection to L/240 supporting the two floors and a non-storage attic.

Expert:  StructuralEng replied 1 year ago.

A steel beam would be a W14x43 (14" deep and 43 pounds per foot). This will need the joists to brace the beam against lateral torsional buckling.

Expert:  StructuralEng replied 1 year ago.

Hello. 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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