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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6689
Experience:  Structural Engineer
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I am adding a lean-to on my existing shop and want to free

Customer Question

I am adding a lean-to on my existing shop and want to free span the roof beams. the addition is 30'x80' spanning the 30' length with 10 beams. the only loading is snow load which code for my area is 15 psf. The 30' beams will set on on two 40' header beams which are free spanning 40' as well
JA: OK. Is there anything else important you think the structural engineer should know?
Customer: I would like to know what size beams I need for both the 30' span and the 40' span. Thanks.
Submitted: 1 month ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 month ago.
Hello
Expert:  StructuralEng replied 1 month ago.
I can help
Customer: replied 1 month ago.
I assume more information is coming??
Expert:  StructuralEng replied 1 month ago.
I can provide one or the other as this question. Each should really be asked separately.
Expert:  StructuralEng replied 1 month ago.
What is spanning the 10' between the 30' beams?
Customer: replied 1 month ago.
2x6 boards on edge to screw the sheet metal roof to - 2x6's will be on 2' centers we will weld clips to the 30' beam to attach the 2x6 boards to
Expert:  StructuralEng replied 1 month ago.
Thank you
Expert:  StructuralEng replied 1 month ago.
You can plan for W10x26 beams ASTM A992 Gr. 50
Expert:  StructuralEng replied 1 month ago.
The purlins will need to be detailed to braced the beams against lateral torsional buckling
Customer: replied 1 month ago.
Do i understand correctly that the W10x36 beams are for the 30' free span? Or are they for the (2) 40' spans that the 30' beams will set on?
Expert:  StructuralEng replied 1 month ago.
The 30' beams
Expert:  StructuralEng replied 1 month ago.
They are W10x26
Customer: replied 1 month ago.
Would a truss make more sense? that is what the existing building is made of.
Expert:  StructuralEng replied 1 month ago.

Not really. Spanning 30' with a 10' spacing is appropriate for steel, not wood trusses.

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