On Thursday, July 24, 2014 7:48:38 AM UTC-7, Gareth Magennis wrote:
"josephkk" wrote in message

...

Please be more thoughtful about how quickly you judge. 1.6 mm is just
about best surface smoothness over a 3 to 5 meter range of a wall, not all
that shabby. If you think you can do better than skilled trades workers
just give a try some time.

In the real world example I gave, i.e. a recording studio, precise
dimensions are sometimes very important.

If the carpenter made a space 1.6mm too small, it could mean that none of
the rack mount equipment would fit in it properly, for instance.

Completely wrong. A rack is furniture, its outer dimensions aren't standardized
(though the inner spaces are). So, it isn't a carpenter's job to make a socket
into which the rack fits.

If you need 1.6mm more space, too, you can push the wall that far (wood
frame, of course, not necessarily brick). If there's baseboard molding,
though, you might want to do some more carpentry...