Rob Graham
We have a number of similar problems with our 70's timber frame
housing stock.
Its' not only to do with wind blowing through the cavity, but also
pressure differentials as well - ie opening doors and windows.
You can try to seal as much of the cavity as possible, but you also
need to remove plasterboard and add extra timber and screw existing
joints of the frame.
However you may need a proper survey with a borescope to check what
the cavity is like too.
dg
Thanks Rob,
The brickwork is sound, no cracking. The real problem is the noise. It
is really loud and can be easily heard over the TV. It is impossible
to sleep thorough.