Hung out to dry

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5 days after soaking the sample of insulation and putting it in an open container in a window it looked pretty sad and dried out.

But it's actually still highly saturated with water as demonstrated by placing a kitchen towel on top. 
If this is still wet after 5 days in the open on a summer day then what chance does a closed cavity with kilograms of the is stuff have of drying out.  If you imagine the piece of tissue paper below being your new plaster board, then you can see that it will eventually wick the water and ruin your internal decor again and again. It simply has to be removed.



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