Propping up a wall for a new lintel when its tricky!

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So ive got to hold up an external cavity wall for a lintel over a big window. The outside should be straight forward, with strong boys in the brickwork, but the internal skin of blocks has a first floor joist right in the way.
The bottom of the blocks to be propped are pretty much exactly level with the bottom of the joist.
Anyone done this before?
Cheers
 
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Add blocks to the strongboys. A block of 50x100 would do it.
 
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Add blocks to the strongboys. A block of 50x100 would do it.

But then wouldn't the block prevent the lintel being installed?

The only way I could think of doing this would be to run a couple of scaff boards at ceiling level and then prop the joists as close to the end as possible. Then go upstairs and hack off the plaster and very carefully check that each joist is well packed up against the the block above it, and if not wedge it or repack.

I'm assuming that your joists are running perpendicular into the wall of course.
 
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I assumed the floor joist is running parallel with the wall.
 
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What's the question?

You can prop the blocks with prop or strong boy, or prop the joists if they are built in.
 
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Thanks for answers everyone.
The joist is parallel with the wall. About an inch from the wall.
I think it's got to be strong boys and slide the beam under. (Unless I'm missing something).
But I'm not getting how the beam won't trap the strong boys.
 
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Prop the inner with the props close to the wall and the corners of the plates under the blockwork. Or additional strong boys

Put the strong boys in higher externally to allow the lintel to be put in and if need be any dropped blocks to be accessed and for making good and packing
 
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Prop the inner with the props close to the wall and the corners of the plates under the blockwork. Or additional strong boys

Put the strong boys in higher externally to allow the lintel to be put in and if need be any dropped blocks to be accessed and for making good and packing
Sorry I didn't get a notification.
It didn't occur to me to use acros like that. Does the beam go under the flange of the acro then slide it out?
I might have to plane a bit off the joist but it's practically under the skirting board in the bedroom so not holding much.
 
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Did you get this done OP? We did one with the joists parallel and knotched the joist the thickness of a strong boys arm and ground the blockwork enough to slip the lintel in under it.
Also did the outer wall separately a week later to make things easier.
 
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Did you get this done OP? We did one with the joists parallel and knotched the joist the thickness of a strong boys arm and ground the blockwork enough to slip the lintel in under it.
Also did the outer wall separately a week later to make things easier.
Not yet. I had a local company that sells steel measure up recently. The surveyor recommended having acros outside with needless going through both cavity walls and resting on the bedroom floor above. I don't doubt his knowledge but I can't get my head around that. .
How did you manage to do one side a week after the other?
 
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Not yet. I had a local company that sells steel measure up recently. The surveyor recommended having acros outside with needless going through both cavity walls and resting on the bedroom floor above. I don't doubt his knowledge but I can't get my head around that. .
How did you manage to do one side a week after the other?
Two separate lintels with dpc tray over. That way the place was easy to secure that night. And less stress.
 
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Two separate lintels with dpc tray over. That way the place was easy to secure that night. And less stress.
Its that compliant with regs? I've put just the outside lintel in before as there wasn't one already there but not heard of anyone doing it by choice.
 
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Don't know. We didn't tell anyone. It might depend on how big the opening is?
 
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