(UK) can I put regular rock wool insulation over a boarded loft? Will it have the same thermal impact?

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Under the boards there is 100mm v old insulation. Because the loft is boarded so I’d prefer to leave it and it’s handy for storage if neededCan I just simply lay some rolls over it and it will have the same effect? via /r/DIY https://ift.tt/390B7Pp

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