Can I use pitched roof insulation under floors?

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I bought a load of 75mm Kingspan TP10 for insulating my pitched roof but have found I've got quite a lot left over - I was wondering if this would be suitable to insulate under the ground floor of a bungalow?

The reason I ask was because I thought there may be some breathability needed :?:
 
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It will be ok to use it. On new builds nowadays it is specified to insulate between the joists so go for it.
 

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