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Made a hole this evening, 100mm of space on the pitched section, no insulation. Thinking 75mm celotex and then fibreglass for the lower section. Is 25mm enough of an air gap do you think?
SimonM-
I don't know the building regs requirement, but 50mm is recommended, if I recall.
That also assumes that there is airflow into the eaves.
Insulating blanket might get you a lower u-value for the and depth (or same u-value for a shallower depth)
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Looks like 'roof room insulation' is covered by the new green homes grant. You might be able to get some financial help…
https://www.simpleenergyadvice.org.uk/pages/green-homes-grant
NotThamesWater
dt
Materials sound OK but the details of how it is insulated are crucial and the insulation must be continuous. Judging from the photo the problem is that the pitched roof has not been insulated.