Insulation - rigid or rolls in loft pitched roof?

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Insulation - rigid or rolls in loft pitched roof?

Insulation - rigid or rolls in loft pitched roof?

Hello

I had to have some additional rafters put in the roof. The roof is clay tile/battens/counterbattens/membrane/closeboarding. It's a converted loft and the insulation behind the plasterboard is 50mm polystyrene board (white with black flecks). I will be re-plasterboarding and my question is whether I should put it the same polystyrene back, improve it, or whether I can use rolls of rockwool. The rafters are 4x2. I'm not sure whether a pitched roof needs rigid insulation what the...

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by SJRSJR

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