Fixing insulated plasterboard on roof.

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joncooper27

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Hi
I have a roof on a holiday let conversions am fitting insulated plasterboard to the roof which also has Velux windows. As the boards are quite heavy with 50mm Kingspan and 12.5 mm plasterboard is it recommended to use a washer so the screws don’t pull through the board something like below?
https://amzn.eu/d/eGnVwcU
IMG_1242.jpeg

I have put 100mm insulation between the rafters @ 400mm centres with 50mm gap above then I’m planning on installing roofing lats then superquilt insulation then lats the other way and 62.5 insulated plasterboard.
Does this sound okay?
Has anyone any tips or help doing this.
The Velux are the old type without the insulation, what’s the best way to insulate around them ?
 

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