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gillies
As you know all about sustainable practice, and you're insulating your home, I reckon you're the right person to ask.
I noticed you're using PIR insulation. Do you know anything about the balance of using a more eco friendly option? ie the impact of producing PIR vs how much less energy you'll use to heat the home.
We have the option to insulate a new roof with rockwool etc rather than PIR, can't really work out what the best, least impact route is.