Hi

My ceiling in my back bedroom used to be covered with badly fitting
polystyrene tiles. Underneath the ceiling tiles I find ceiling wall
paper. Underneath a few of the loose tiles I found what looked like
black mold, although the ceiling didnt feel damp to the touch.

Now that the ceiling is bare I can see the reason for the polystyrene
tiles. The ceiling is quite bowed, but I dont have a problem with this
as the house was built in 1900 so most ceilings this age probably bow to
some extent. What is a problem is the part with the black mold is quite
badly bowed and cracked. Each part of the ceiling where the cracks are
will bend gently upwards independently of the rest of the ceiling, so
the crack must go right through the ceiling board.

I have hoovered teh black stuff off the ceiling and it looks quite a bit
better.

Can I get some pollyfiller that will fill teh cracks on the ceiling - or
will this just crack again and fall out?

The room isnt that big - big enough for an adult single bed and a small
table & storage cupboard. Would it be expensive to have the ceiling
replaced? Are there certain materials that shoudl be used when
replacing the ceiling? I seem to remember people mentioning two
different thicknesses of ceiling board and only the thicker sort is any
good whereas the thinner board will just bow.

Thanks for any help

S.