"Roger Mills" wrote in message
...
In an earlier contribution to this discussion,
benpost wrote:

where i only own the ground floor...

so cavity wall insulation isn't really an option as upstairs dont seem
to have the problem as bad.


Well then just fill the cavity up to your ceiling level - if the people
above don't want their bit doing then sobeit.

They will not partially fill and water can move across the top of the
insulation.