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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6686
Experience:  Structural Engineer
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I am building a 14'X20' sun room, my house has a 2' over

Customer Question

I am building a 14'X20' sun room, my house has a 2' over hang on the second floor making the roof size of the room 20'X12' (the extra 2 feet is under the overhang). The roof pitch is 3.5/12. The contractor incorrectly installed one 2X10 LVL ridge beam for the open cathedral ceiling. The plans called for two 2X12 LVL ridge beams. The town says I need to see if that 1 beam will hold or I need to install what the plans calls for. The open span that this beam supports is about 11.5 feet. I am looking to see if I can just keep the 1 2X10 LVL beam or if I can add a second 2X10 LVL beam next to it. I would prefer not to install the 2X12 beam because I have gable windows that the beam would sort of interfere with. How can I see if the 1 or 2 2X10 LVL will support?
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.

Hello

Expert:  StructuralEng replied 1 year ago.

I can help.

Customer: replied 1 year ago.
first time here. are you there?
Customer: replied 1 year ago.
hello?
Expert:  StructuralEng replied 1 year ago.

I'm gathering my questions for you

Customer: replied 1 year ago.
ok. thanks.
Expert:  StructuralEng replied 1 year ago.

What is the city and state?

Expert:  StructuralEng replied 1 year ago.

What is the rafter length? 12'? 14'? The ridge is only spanning 10', not 24'?

Customer: replied 1 year ago.
sending a picture.
Customer: replied 1 year ago.
the room is 20' wide 14' deep.
Customer: replied 1 year ago.
minus the 2' overhang and 2X6 construction for the exterior wall. the span is about 11.5 for the ridge beam
Customer: replied 1 year ago.
I am in Easton, Maryland
Expert:  StructuralEng replied 1 year ago.

Ok. 12' rafters in each side

Expert:  StructuralEng replied 1 year ago.

Give me a few minutes to run some numbers

Customer: replied 1 year ago.
ok. thanks
Customer: replied 1 year ago.
Do I leave and come back when you answer. Sorry just new to this.
Expert:  StructuralEng replied 1 year ago.

I'm back

Expert:  StructuralEng replied 1 year ago.

A double 1.75 x 9.25 2.0E LVL works for strength, but deflection is higher than desirable for a ridge beam. The strength does work, though. If you can get a triple in, that will get you closer to where you need to be for deflection.

Customer: replied 1 year ago.
Hi. I apologize for taking so long, this is the first time I have used this and thought it was a quicker process. You had said that the double works for strength but nor for deflection but a triple would be close. Do you have more detailed numbers or some sort of report/chart that I can submit with my plan revision showing what those numbers would be for my room? Thank you.
Expert:  StructuralEng replied 1 year ago.

I can provide detailed calculations for bending, shear, and deflection as an additional service. I can submit the offer and if you accept it, I will post th calculations for you by 5 pm EST

Customer: replied 1 year ago.
Let me contact the town to see exactly what they are looking for so I can make sure I am asking for the right information.
Expert:  StructuralEng replied 1 year ago.

Sounds good.

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