RedOnRed wrote:
"Phil Anthropist" wrote in message

When you tap the areas of plaster that are subject to cracking, with the
blunt handle end of a screwdriver, does it sound hollow and different to
the sound when tapping others areas of plaster away from the windows? If
so, the plaster near the new frames has come loose from the underlying
masonry and needs to be hacked off and repaired.

Yes, some of the plasterwork that is cracking does seem to be making a
hollow noise when tapped, but i've also noticed that plasterwork that shows
no evidence of cracking is also making the noise too.

problem located, replastering time.

NT