I have taken down the attic stairs to raise the ceiling in the basement stairs... At the "bottom" of the attic stairs, there was a small floor that needs to be removed.

I am tearing up the floor and what do I find... Two radiator pipes and a load-bearing beam that supports the kid's bedroom :(

The radiator pipes can just be replaced with copper pipes and placed on the new wall that will be put up.

But the beam...

There is a beam parallel to the stairs that I hoped would extend all the way to the outer wall, but it ended shortly after the attic stairs where it rests on one of the floor joists from the bedroom that goes to the heart wall. My idea is to cut off that floor joist. and then extend the joist that runs parallel to the stairs so that it ends on the outer wall instead (as I hoped it was from the beginning).

The question is how to attach these three joists in the best way.

The first picture shows how the joists are positioned today. The second picture shows how they should be positioned. I considered tearing up the ceiling in the basement and placing the largest angle brackets I can find (maybe several) in the "corner" that will form. And then placing a perforated plate on the other side. I'm hoping to find a perforated plate that is 800x200 to cover as much area as possible.

I'm also considering placing a T-shaped flat iron under the joists for extra support. For the flat iron, I might use 4 mm or something like that.

Can this hold? Or can any smart person here come up with a better solution?

EDIT: The joists are 70x210
 
  • Diagram showing two perpendicular beams; one vertical, one horizontal.
  • Diagram showing the current configuration of joists in a T-shape, related to a renovation project involving removing a floor section.
  • Wooden beams exposed after removing attic stairs, showing infrastructure challenges including two pipe elements and a beam supporting an upstairs bedroom.
  • Wooden beams and old flooring structure exposed during renovation. Two pipes visible below the wooden platform.
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