On Feb 1, 6:01 pm, harry wrote:
On Feb 1, 2:36 pm, numtys numty
wrote:

After having ground floor ceilings re-plastered for a second time, they
are once more showing cracks. I assume the joists are moving and
causing this to happen. The floors above the ceiling are extremely
noisy when anyone is upstairs.
Does anyone have any suggestions on how to replace the ceilings as
re-plastering is very expensive and obviously not the answer.

Thanks in anticipation
--

Archie Gallacher

If the cracks are very long it's likely that they are the joints
between the plaster boards. These should have had scrim applied to
them when they were plastered. (It's a roll of stuff that looks like
loose weave bandage.) Made out of glass fibres these days. You can
reskim the cieling putting some in or you can grind a track out along
the cracks about three inches wide with a belt sander and put some

in. You will need to use unibond in the plaster to get it to stick.

I've never had to use unibond to make plaster stick to scrim tape??

Jim K