Can I splice 2"8 all the way on the top beams and collar beams to remove the longitudinal load-bearing beam?
This is to remove the old "cold attics" on both sides of the house and to get a larger upper floor.
There is no wall anywhere on the lower floor; instead, the exterior walls are load-bearing there.
How wide is the building?
The exterior wall visible in the pictures cannot absorb outward forces, which makes it a bit risky to remove the support beam.
Can't you leave the support beam and post in place?
It will probably be fine.
If the floor beams and upper arms together with the hanbjälkar form a proper truss, then there's no problem. But you must ensure that there is indeed a sufficient joint where the floor beams meet the upper arms. Then you must keep the outer support legs.
Sturdy nail plates when you're splicing increase the rigidity of the structure.
The building is 6 meters between the outer walls. I am going to renovate the upper floor so that I can place the walls in the middle of the building on the collar beams. What I was worried about was if the top plates would give way between the outer wall and where the collar beam begins.
I will reinforce the outer wall to create a strong joint for the rafters to rest on.
Then I will prop up the rafters, remove the longitudinal beam, and nail 2"6 on both sides of the top plates and the collar beam with nail plates. That should make it strong enough. I considered nailing 2"8, but that would lower the ceiling and I don't want that. So, I will use double 2"6 instead.
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