The mould comes from a leaky tap and bath spillages.
When the floor is sloping and waterproof I will replace the plasterboard.

[g]

On Sunday, March 15, 2020 at 11:52:40 AM UTC, wrote:
On Sunday, 15 March 2020 09:51:31 UTC, George Miles wrote:
"George Miles" wrote in message
...

There's mould on the kitchen ceiling under the bath!
I'm thinking of pulling up the floorboards,
putting down 18mm OSB3 sloped to a point
with some kind of drain.
Then covering it with Lino or similar.
Much cheaper and quicker than a wetroom kit like
https://www.screwfix.com/c/bathrooms...kit/cat8780001
Advice please
george


why would it be damp under the lino?
I thought its waterproof.

because
There's mould on the kitchen ceiling under the bath!

Just in case you don't know, black mould is bad news for health and must all be removed.