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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6748
Experience:  Structural Engineer
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My house is 24' wide with trusses in middle. How big does

Customer Question

My house is 24' wide with trusses in middle. How big does the header need to be to span 17'?
Submitted: 9 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 9 months ago.
Hello.
Expert:  StructuralEng replied 9 months ago.
Roof trusses or floor trusses?
Customer: replied 9 months ago.
Roof trusses
Expert:  StructuralEng replied 9 months ago.
The trusses are only in the middle?
Customer: replied 9 months ago.
All bearing in the center of the house.
Expert:  StructuralEng replied 9 months ago.
The trusses are supported in the middle. Not the trusses are in the middle?
Expert:  StructuralEng replied 9 months ago.
Are they manufactured trusses with metal plates connecting the members?
Customer: replied 9 months ago.
They are bearing on the header in the middle.
Expert:  StructuralEng replied 9 months ago.
Are you sure? Trusses typically bear only at the ends, not in the center.
Customer: replied 9 months ago.
it's a manufactured, mobile home that is split in the center. I got 9' inch header one ply each side.
Expert:  StructuralEng replied 9 months ago.
What is the city and state so I can look at snow loading?
Customer: replied 9 months ago.
Marshfield, Wisconsin
Expert:  StructuralEng replied 9 months ago.
You need a 3.5" x 14" 2.0E LVL on each side, so a total of 7" x 14" 2.0E LVL
Customer: replied 9 months ago.
a 9" header that I have now gives me 82" head room, if I go to 14" it only gives me 76", I need to keep it at 9" to walk through.
Expert:  StructuralEng replied 9 months ago.
Then you need steel
Customer: replied 9 months ago.
What would I need in the steel then?
Expert:  StructuralEng replied 9 months ago.
Two W8x35 ASTM A992 Gr. 50
Customer: replied 9 months ago.
can I add to the existing beam that is already there?
Expert:  StructuralEng replied 9 months ago.
Is it steel or wood?
Customer: replied 9 months ago.
instead of taking it all out and putting in an I beam?
Customer: replied 9 months ago.
it is wood?
Customer: replied 9 months ago.
I mean, it is wood that is already there.
Expert:  StructuralEng replied 9 months ago.
It can't be done out of wood and the existing wood beam will not contribute enough to help
Customer: replied 9 months ago.
How about if I put a column in instead. Would one be enough to span the 17' with the existing header?
Expert:  StructuralEng replied 9 months ago.
No. A single 2x10 will not be able to span anywhere close to 8'
Expert:  StructuralEng replied 9 months ago.
No. You can't span 8.5' with a single 2x10
Customer: replied 9 months ago.
Currently I have a 6" opening on one side, 5" on the other with a center wall of 5"6' under the header now.
On the steel, are you saying I need two 8' I beams, one beam on each side?
Expert:  StructuralEng replied 9 months ago.
One on each side.
Customer: replied 9 months ago.
So, you are saying I need a total of 16" header of 3/8 steel to support what my single ply header on each side with a 5'6" wall does now?
Expert:  StructuralEng replied 9 months ago.
The wall has studs. The header is not spanning. You need 8" of depth on each side, not 16"
Customer: replied 9 months ago.
but it is still 16 inches wide total.
Expert:  StructuralEng replied 9 months ago.
Yes. To span 27' with that much load and the depth restriction you have, yes.
Customer: replied 9 months ago.
The span is only 16.5 feet, not 27 feet.
Expert:  StructuralEng replied 9 months ago.
I meant 17'.
Customer: replied 9 months ago.
Ok, we will go with someone locally to help.
Expert:  StructuralEng replied 9 months ago.
You're not going to get a different answer elsewhere. The numbers are what they are.

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