On 2014-11-19, Adrian wrote:

On Wed, 19 Nov 2014 18:43:37 +0000, ARW wrote:

The rear extension is about 3m wide. Now the joiner who helped with the
acro's (the one who built the internal studding) says that the tops of
the wall were both about 20mm out (ie both 20mm out) but the RHS wall
(facing from the outside) was not plumb when he built the internal
studding and that the LH wall had moved further. The LH wall had a crack
appear at floor level.

This picture of the LH wall shows (to the best of my ability) how the
top and rear of that wall splayed out more than the rest of the wall.

http://wiki.diyfaq.org.uk/index.php?title=File:026.JPG

At what stage do you say "Sod this", step well away, and await (or help
along) the inevitable?

*Before* it falls on his head? At least so far...

;-)