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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7006
Experience:  Structural Engineer
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The span is 12', it is a loading bearing wall on the main

Customer Question

The span is 12' long, it is a loading bearing wall on the main floor of a two story house, what the size of the beam I should pick?
Submitted: 10 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 10 months ago.

Hello

Expert:  StructuralEng replied 10 months ago.

I can help

Expert:  StructuralEng replied 10 months ago.

What is the joist length on each side of the beam? Will it support any ceramic tile? Do you wNt wood or steel?

Customer: replied 10 months ago.
One side is 11feet long, the other side is 16'
Expert:  StructuralEng replied 10 months ago.

Supporting the second floor and attic? Will it support any ceramic tile?

Customer: replied 10 months ago.
it is on main, supports second and attic, no ceramic
Customer: replied 10 months ago.
What is the size of beam and how many?(sistering)
Expert:  StructuralEng replied 10 months ago.

You can plan for a 5.25" X 11.875" 2.0E LVL

Expert:  StructuralEng replied 10 months ago.

That will work for strength and limit deflection to about L/360

Customer: replied 10 months ago.
I dont get it, I ever seen that stuff in community Centre but please don't make it complicated, it is a residential house, I want use 2x10, or 2x12
Customer: replied 10 months ago.
I'm not an expert, don't pour professional terms on me. That won't resolve the issue, I prefer plain words. Thanks
Customer: replied 10 months ago.
If I know that term or abbreviation I would figure out myself.
Expert:  StructuralEng replied 10 months ago.

You can't use dimension liner for this application. It's not strong enoigh

Expert:  StructuralEng replied 10 months ago.

LVL is engineered lumber. The dimensions are 5.25" wide X 11.875" deep. 2.0E is the stress grade

Expert:  StructuralEng replied 10 months ago.

You would need 9 - 2x12 Doug-Fir no. 2. That's not practical

Expert:  StructuralEng replied 10 months ago.

LVL are commonly used in residential construction

Customer: replied 10 months ago.
I'm not satisfied with your answer
Expert:  StructuralEng replied 10 months ago.

Based upon what exactly?

Expert:  StructuralEng replied 10 months ago.

I'm sorry you clearly don't like the answer, but the numbers are what they are. I can't tell you to use a beam size that doesn't check out. That would irresponsible and unprofessional of me.

Customer: replied 10 months ago.
What if (another wall) the same span, one side joists (10')to be supported, the other side is parallel with the beam, what the size of beam?
Expert:  StructuralEng replied 10 months ago.

Then you could use a triple 2x12 Doug-Fir no. 2

Customer: replied 10 months ago.
What the length of both ends need to be supported by post or column? 6", 7", 8"?
Expert:  StructuralEng replied 10 months ago.

3" minimum, but I would recommend full bearing on the appropriately sized post

Customer: replied 10 months ago.
If three 2x6, that would be 4.5"?
Expert:  StructuralEng replied 10 months ago.

Yes

Customer: replied 10 months ago.
What if I don't put the three 2x12 attached, I want 1" or 2" space between, is that ok? Because I need to run wires or cable in the space
Expert:  StructuralEng replied 10 months ago.

They need to be attached along their length to properly share load. Cut 3" strips of 1" plywood to attach at the top and bottom leaving a 1" wide X 5.25" tall gap to run your wires. Or 9" tall strips leaving a 1" x 2.25" gap at the bottom

Customer: replied 10 months ago.
If I attach them all together, do i need to lock them up using regular wood screws? How many along the length of beam? The more the better or don't matter?
Expert:  StructuralEng replied 10 months ago.

No 12 X 3.5" at 8" on center. Stagger them high and low

Customer: replied 10 months ago.
What's that mean? Did get it? The beam is actually 11.5" deep, using 3.5" wood screws, where the screws go?
Expert:  StructuralEng replied 10 months ago.

Into the sides to connect the three 1.5" wide 2x12s

Customer: replied 10 months ago.
Can use long enough bolt and nut to attach them?
Expert:  StructuralEng replied 10 months ago.

You can, but it's not necessary

Customer: replied 10 months ago.
Ok the beam is 11.5 deep or wide, the screws must be located 1.5" from both edges, so there is 8.5" between the two lines of screws along the length of beam? What the distance between the two screws in the line of screws?
Expert:  StructuralEng replied 10 months ago.

a 2X12 IS 1.5" WIDE x 11.25" deep. Therefore, three of them are 4.5" wide x 11.25" deep.

Expert:  StructuralEng replied 10 months ago.

There should be two lines of screws. One top - 2" from the top of the beam and 8" between each screw.

One bottom - 2" from the bottom and 8" between each screw. The two rows should be offset by 4" so that the screws are staggered.

Customer: replied 10 months ago.
we can say it is 4.5" thick all togethet
Expert:  StructuralEng replied 10 months ago.

Correct

Customer: replied 10 months ago.
Ok clear this time.
Customer: replied 10 months ago.
You from California?
Expert:  StructuralEng replied 10 months ago.

No problem. I'm happy to help. Good luck with your project

Expert:  StructuralEng replied 10 months ago.

I am not located in CA

Customer: replied 10 months ago.
Where?
Expert:  StructuralEng replied 10 months ago.

PA

Customer: replied 10 months ago.
I need your professional registration or license # ***** similar # ***** for record
Expert:  StructuralEng replied 10 months ago.

I don't provide personal information over this website

Customer: replied 10 months ago.
Or how could I know who gave this answer?
Expert:  StructuralEng replied 10 months ago.

You can see on my profile page that my license has been verified by a third party. I could not stamp anything for you, even if I were registered in CA because I was not able to visit the site myself to verify the information provided by you. This is not meant to replace an engineer stamping something for you. That's a $500+ proposition.

Customer: replied 10 months ago.
Need someone responsible for this answer
Expert:  StructuralEng replied 10 months ago.

I'm going to opt out now for you. Good luck with your project.

Customer: replied 10 months ago.
I need someone responsible for the answer based on the information provided
Expert:  StructuralEng replied 10 months ago.

The answer is exactly correct. If you want detailed calculations, I'll be happy to provide them as an additional service, but I will not provide any personal information

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