Well done indeed guys!, but when it comes to cavity wall insulation preventing bee's from making a home I'm not so certain! one 6 year old colony that I removed from a gable end of a thatched property had a cavity of nearly 10 inches filled with fiberglass insulation "originally" however the girlies removed 90% of it to create a huge home for themselves, all through one half inch dia hole, what a work ethic.