Above all the doors in my basement, the beams are made of blåbetong and I would like to replace them. I'm thinking of starting with the one at the outer wall. Is it a matter of just removing the door frame and then sawing/knocking/chiseling away the old beam and replacing it with a wooden beam? The door is on the short side of the house and leads to the garage, so no water comes into contact with the wall, so wood should be fine here? Load-bearing capacity shouldn't be a big problem since it's the short side of the house and the floor joists run from long side to long side, or am I completely wrong here?
You should first find out if it is a load-bearing structure. Is it just blåbetong blocks or actual beams?
If there are beams, they are probably there for a reason...
I would support it before knocking away any beam.
How do I find out if it is a load-bearing structure? It is an exterior wall, so I assume it is load-bearing, but it will only be a hole of about 1.5 meters.
It has been sawn about 1dm from the bottom and up because they once put in a larger door, so it looks like it's a whole beam and not blocks, but I think it might be easier to place a beam that spans the entire doorway instead of trying to keep several blocks in place, so that might be the reason there is a beam above the doors.
I've chipped away some plaster and this is what it looks like
The blåbetong is very porous and easy to chip away, but it is reinforced. Personally, I find it hard to see it as load-bearing considering it seems very weak, but what do the experts say?
How on earth do I prop it up if I want to stamp, considering it's a brick basement wall? There's really nowhere to place the supports.
I'm also a bit worried that the bricks will fall down if I remove the beam. Does anyone have an idea on how to prevent this?
You prop the floor joists if you are going to prop. If it's the short side, it's likely not load-bearing. Which direction does the floor on the floor above run? Do you know? Can you see the nails in the basement ceiling, across the house or along the house?
Ok, then the load is not as great but it still carries quite a bit. For example, the wall above. It is unlikely to collapse without support, but you at least risk cracks in the facade.
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