>> Erm... I might be missing something but if it's rockwool (vile stuff) then can't you
>> just put boards on top and squish it down a bit?
>>
>> I've done this in my house where the insulation normally stands about three inches proud
>> of the joists.
>>
That reduces the insulation value, but assuming that only a relatively small percentage of the ceiling is being boarded it probably doesn't matter too much.
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