Bay window ceiling

[Bentheblind]

Hi all I’ve just found this forum online and everyone seems to be very helpful and knowledgeable so I wondering if I could get some advice with my issue I have a lath & plaster ceiling that the cornice has dropped along with around 10 cm of the ceiling I’ve used some wood to prop it up for now
Any advice is really appreciated
Also I’m 100% if this is in the right section

 

[Notch7]

Is it a flat roof above or is it another bay above?

I just wondered if a roof leak has led to this.

To be honest it’s probably not repairable, it probably needs taking out and replacing with plasterboard.

 

[Bentheblind]

It’s a slightly pitched slate tiles there doesn’t seem to be any moisture by it on the inside and the tiles and lead flashing visually looks ok
It’s a old semi dating back to around 1890 I believe with a cellar on quite a busy road when some heavy vehicles speed past you feel it in the rooms at the front
When you say replacing do you mean the whole ceiling?

 

[ree]

OP,
Best practice would be to remove the blinds, curtains & curtain rail - and then post pics of the inside of the bay, and pics showing the outside of the bay, & the roof &flashings?
Put a level both ways to the bay ceiling - look for drops.

It looks like there have been previous repairs to the "cornice" & "cornice" area?
Does the ceiling have a short slope as it goes behind the "cornice"?
As above, it might be that the bay ceiling only has to be replaced by plasterboard but hold fire on doing that.

 

[Bentheblind]

Thanks I thought the same about some kind of previous repair/bodge
I’m away for a week now but I'll update with the pics once home
Be nice if it ends up just the bay ceiling needing replacing fingers crossed.