On 27/02/2011 18:41, Andrew Gabriel wrote:

snip

The house has temperature logging, but not in the loft. So, I just
added a sensor in the loft and I'll compare it with the outside sensor.
Having come out of the loft and closed the hatch, the loft temperature
is rapidly dropping towards outside temperature, but too early to know
where it will settle yet.

Temperature is only half the equation. Do you have a dehumidifer to put
up there for a bit to see how much water you can extract at say 80%
humidity?