I can help
What is the joist length on each side of the beam? Will it support any ceramic tile? Do you wNt wood or steel?
Supporting the second floor and attic? Will it support any ceramic tile?
You can plan for a 5.25" X 11.875" 2.0E LVL
That will work for strength and limit deflection to about L/360
You can't use dimension liner for this application. It's not strong enoigh
LVL is engineered lumber. The dimensions are 5.25" wide X 11.875" deep. 2.0E is the stress grade
You would need 9 - 2x12 Doug-Fir no. 2. That's not practical
LVL are commonly used in residential construction
Based upon what exactly?
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.
Then you could use a triple 2x12 Doug-Fir no. 2
3" minimum, but I would recommend full bearing on the appropriately sized post
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
No 12 X 3.5" at 8" on center. Stagger them high and low
Into the sides to connect the three 1.5" wide 2x12s
You can, but it's not necessary
a 2X12 IS 1.5" WIDE x 11.25" deep. Therefore, three of them are 4.5" wide x 11.25" deep.
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.
No problem. I'm happy to help. Good luck with your project
I am not located in CA
I don't provide personal information over this website
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.
I'm going to opt out now for you. Good luck with your project.
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