harry wrote:
On Feb 28, 5:06 pm, Tim Streater wrote:
In article ,
The Natural Philosopher wrote:

Andrew Gabriel wrote:
[snip]

Another interesting observation. In the loft is a large metal tray,
4' x 3' (originally the side from a 19" rack). It was originally
supported above the new insulation, but the insulation has expanded
a bit since laying, and was now touching the bottom. There is a
little condensation on the bottom of this, which implies some
moisture is working it's way through the ceiling, which is lath
and plaster at that point, but not cracked. I still find it hard
to believe all the moisture in the loft is coming from the house
though.
Are you saying that you have no vapour barrier underneath the
insulation? and that it's jut lath, plaster and rockwool there, alone?
Arrrhhh, are you saying there should be something? So you don't just put
the fibre-glass or whatever between the joists and run away?

--
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted" -- Bill of Rights 1689

The emulsion paint on the ceilng below usually acts s a sufficient
vapour barrier.

You are joking aren't you?

Drop a splash of water on any emulsion painted plaster..does it run off?
Nope. it soaks right in, unless you have a vinyl plasticky paint for
bathroom use.