The inquiry, which has been going for two weeks, is investigating what warnings the government received about the home insulation program and whether the men's deaths could have been avoided.
It has already heard how bureaucrats were repeatedly warned installers would die on the job if safety concerns weren't addressed.
It has also been told that installers only required a general safety induction before entering ceilings.
The royal commission before Ian Hanger, QC, resumes on Monday.
