An ex-cop has been revealed as the contractor who was caught on CCTV not putting insulation into the walls of a Dunedin home. Video / SuppliedA Dunedin man is shocked after a former senior police officer charged him $4700 to insulate his walls, but left half of them empty. Bracegirdle was contracted to retrofit wall insulation, which involves drilling a hole and pumping the product into the cavity, into all walls of the home. CCTV footage supplied by the homeowner shows Bracegirdle drilling into a wall, then filling the holes with putty without installing insulation material. After more insulation was injected during the visits, the homeowner accepted the walls were as good as they could be.