Using two 2x12 that are 12' long tied to a supporting a Load Bearing ceiling with no floor above, can 24 inches be used as a cantilever to support another load bearing ceiling supporting wall?

To clarify in attached picture, I want to eliminate 24inches as shown or scribbled out, and tie the two 2x12 into that 'B' Support wall. The 'B' wall which is shown in the picture is a wall with an opening cutout. The B 'Portion shown is 15inches wide (ceiling to end) from the cutout it is 6' to the tie-in to 'A' Wall.

To simplify my question I would be leaving the B portion and upper A portion and 24" would be removed from the 'A' wall.

Simply having 24 inches now hanging with two 2"x 12" married together to support the other load bearing wall.

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  • 2
    I am unable to understand what you are trying to do. The picture does not clarify. 12" 2x12? ( " is inch ) 24" now hanging? Perhaps you can take minute to think of a different way to explain your are talking about, what is your goal? – Alaska Man Nov 28 '20 at 18:33
  • IIUC, you want to cut wall A at the line near A, leaving a 24" long, 12" tall beam that will meet up with the beam labeled B. This means that the current beam B will no longer have wall A to support it, so your cantilever will not only be supporting its own 24", but however long beam B is as well. Can you do this? Sure. Can you do this based on advice from well meaning strangers on the internet? Probably not safely. You really need to have a structural engineer on site to analyze the loads and design the structure or you risk damage and injury or death. – FreeMan Nov 28 '20 at 19:02
  • The end of A may be a post to support a beam in the upper B. We do not know. "Simply having 24 inches now hanging with two 2x12 married together". I still do not understand what that means. – Alaska Man Nov 28 '20 at 19:03
  • It's not particularly clear, @AlaskaMan, but I think he wants to have B meet up with a cantilevered beam from wall A without any support underneath, opening up wall A to the front door. I'm sure it's possible with the proper amounts of steel and posts in the right places, but I doubt anybody here would be willing to stick their neck out to say how to go about doing it. Far too many unknowns from this side of the monitor. Even Lee Sam probably wouldn't touch this one with all his engineering knowledge. – FreeMan Nov 28 '20 at 19:06
  • The "'B' wall which is shown in the picture" is most definitely not "a wall with an opening cutout". 'B' upper is a beam, 'B' lower is a pony wall or knee wall, and they are entirely separate from each other... Your idea is likely to fail spectacularly unless you completely re-engineer & rebuild both 'A' and 'B'. – brhans Nov 29 '20 at 1:26

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