On 14/02/18 14:32, Bob Minchin wrote:
What is the construction of your roof? If it is a modern warm roof then
you might be OK but if it is a traditional cold roof, it will get
stupidly hot in summer and almost certainly kill your equipment.


Good question and it's a retro warm roof (from the POV of being inside).

That is to say, there is 75mm celotex between the rafters, 15mm under
and then 9.5mm PB over the more accessible parts to protect the celotext
from dents and fire.

The attic is thermally part of the upstairs room (thin pannelling will
separate them)