Kevin Rudd and Julia Gillard have been told to prepare to give evidence in the royal commission into the former Labor government's bungled home insulation scheme.

Fairfax media reports that the former prime ministers, along with five other Labor ministers, have been told to surrender any documents relating to the 2009 Home Insulation Program, which has been blamed for the deaths of four men. Summonses have reportedly been sent to Mr Rudd, his deputy at the…