Neil Jorgensen strapped a 13-year old girl to a monster truck and drove it through a firewall over Labour weekend in Rangiora.

Worksafe New Zealand is looking into the case of a 13-year-old Christchurch girl who was strapped to the front of a monster truck and crashed through walls set on fire.

The stunt was performed in front of about 2,000 people as part of a demonstration by monster truck business Monster Madness NZ at the A&P show in Rangiora over Labour weekend.

The teen was dressed in a fire retardant suit, put into a metal stand that was secured to the front of a truck, and driven through four 'fire walls' made of timber and straw, sprinkled with gasoline and ignited with a cigarette lighter.

SUPPLIED The girl's parents had given her permission to take part in the demonstration.

A spokesman for Worksafe, New Zealand's national health and safety regulator, said the agency was trying to establish whether the Health and Safety in Employment Act would apply to the event.

Blenheim man Neil Jorgensen, who owns and operates the monster truck business, enlisted the girl to perform the stunt. Her parents, who are friends of his, had given permission for her to take part.

Jorgensen said he called Worksafe on the advice of friend after the show, because he was injured in the process of the demonstration. He said the Worksafe staff member he talked to had no issue with the stunt.

Worksafe has been unable to confirm a record of Jorgensen's call.

Jorgensen also said he had the A&P show sign off on the event.

"Nobody had any problems with it as far as I am aware," he said. "She was keen and everybody was happy."

It was the girl's first time attempting the trick, and Jorgensen's fourth time.

The Christchurch teenager suffered some blisters, but Jorgensen said she was resilient.

"I asked her if she would like to do it again and she said 'yep, when?'" Jorgensen said.

The stunt man, with 30 years of experience in the business, was in the cab driving the truck during the stunt.

He ended up getting scorched with what he called a "sunburn".

"Unfortunately, with the laws of averages and occupational hazards, these things happen," he said. "You can have the best plans in the world and still get it wrong, that's the nature of the beast."

The stunt was not without risk, he said.

"You ensure your safety as best you can, it is always a calculated risk and there is always something that can go wrong. You can do it 100 times and not a problem, like people jumping out of an airplane and 101 [times] you've got an incident."

Jorgensen said he had briefed the teen for weeks prior to the event, advising down to even the safest underwear to wear to be as flame retardant as possible.

He had checked she was wearing the correct clothing before putting her in a fire suit and strapping her to the stand.

"[The stand] is solidly secured to the front [of the truck], designed to take the hit rather than the person take the hit," he said.

"It's like the person is just going for a ride."