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SimonM in reply to @Zebra_Cyclist

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?

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NotThamesWater in reply to @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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