The Royal Commission into the home insulation program in Brisbane has heard a pocketbook detailing safety hazards for installers was not printed until two months after the program began.

Four people were killed during the seven months the scheme operated, with two of them electrocuted using metal staples on foil.

The inquiry is looking into the former federal Labor government's decision making processes at the time.

The $20 million inquiry is into its third week.

Former public servant Kevin Keeffe, who helped design the scheme, has faced intense questioning on his third day giving evidence at the inquiry.

Mr Keeffe has repeatedly told the inquiry of the time pressures faced in rolling out the scheme as part of the former Rudd Government's job stimulus program.

A pocketbook was developed in consultation with industry, warning the practice of stapling metal foil to ceiling joists posed a high risk of electrocution.

But Mr Keeffe told the inquiry that the safety booklet was initially only available online from early August 2009.

He said it was not approved for printing until the end of August, when the program had already been running for two months.

Mr Keeffe told the inquiry there was no scope in his position as Environment Department assistant secretary to ban the use of foil despite safety concerns.

Stephen Keim QC, acting for one of the victim's families, asked Mr Keeffe if people were going to die if they touched a product, would he ban it?

Mr Keeffe replied he could not ban it.

He was asked if he could make a recommendation and replied he was not in a position to.

Yesterday he says he was well down the chain of command in public service hierarchy.

The commission is also expected today to hear from Andrew Wilson, who was in the coordinator-general's office in the Department of Prime Minister and Cabinet at the time, as well as Malcolm Forbes, who worked in the Federal Environment Department.

They will take the stand when Mr Keeffe finishes giving evidence.