On 19/03/2018 21:37, Vir Campestris wrote:
On 19/03/2018 10:26, Brian Gaff wrote:
Well the earth is curved after all, so in reality nothing is flat or
level
is it?

Nothing's flat or level in this house. It probably wasn't when it was
new (peasant's cottage) and now one of the upstairs floors has a 1 in 10
slope!

On the walls - I don't try to make things level. I make them parallel to
the floor or ceiling (if close) or half way between. On the walls with
exposed vertical timbers pictures are hung to line up with the timbers.

Andy

There are no flat walls or completely rectangular door frames in
my 1976 semi. The lounge ceiling below the hot tank has deflected
by about 20mm because they used pairs of 50mm beams but didn't bolt
them together, just laid with a 10 cmm gap between them.

Naturally they sagged as they dried (3 inch cinder block upstairs
internal walls with sand'n'cement base coat 'plaster'.)