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I am about to install 2 downlights (GU10s) in a pitched roof/ceiling that is almost fully filled with Kingspan insulation board. How far back should the insulation board be cut for a GU10 fixture? Obviously it's a trade off between thermal performance of the ceiling and the amount of space...

I am about to install 2 downlights (GU10s) in a pitched roof/ceiling that is almost fully filled with Kingspan insulation board. How far back should the insulation board be cut for a GU10 fixture? Obviously it's a trade off between thermal performance of the ceiling and the amount of space...