The government is committed to homeowners to protect their homes but builds a cavity wall (Spouwmuurisolatie) as a barrier against moisture penetration. What happens when you fill the cavity with the insulating material? In other words, when is the cavity wall not a cavity wall? A: When it is filled with damp fluffy things.
One photo shows that wet mineral fibers were removed from the house in the “Sunday Workers’ Guide” on page 157 of my book, which is available on the pages of the book on this site.