It makes very little difference once you go over the 250 - 300mm thickness as other factors such as ventilation requirements come into play.
Thanks for the replies. By ventilation do you mean ventilation in the attic or the the property itself.
Thanks
Both really. If the air infiltration rate is too high in your property, then you will not be able to hold an internal temperture for long, no matter how much insulation you have.
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