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It is following the roofline, and there are some very small hairline cracks following the bricks in a similar place on the outside.
We've got a builder coming at the end of the week, is that too late?
tbc-
Can you not contact whoever fitted the steel support?
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It is following the roofline, and there are some very small hairline cracks following the bricks in a similar place on the outside.
'Following the bricks' meaning running through the mortar rather than actual bricks snapped in half?
I'm inclined to agree with @Airhead and say don't panic. You've been fiddling with the structure of the house and it's probably just dropped a couple of mm. There's every chance the settling is now finished, the crack will never widen and a quick patch of plaster repair will see it sorted forever.
A structural engineer will give you the most reassurance.
rodabod
Hefty
You can't put your hand in it, it's not a significant problem. If you replaced the steel below and the wall below has dropped a little onto the steel then this is pretty normal. Is it following the roof line outside or does the crack go through the bricks?