Homes such as this one that had a poor product installed that now leaves voids in place will need to have the current insulation extracted first.
We can guarantee the work if we do the extraction and the fill.
We would use the same homes to refill the insulation as we used to take the old, under perfuming and possibly damaging insulation out.
This house is in an exposed position and one half of the home got especially cold. So there are options if your home is in a similar position.