A second teenager who suffered "catastrophic" burns at an allegedly unsupervised party west of Brisbane is suing for $6 million.

Matthew Richards and Paris Turkington were engulfed in flames when another teenager allegedly threw an accelerant on a fire at the Toowoomba home in 2013.

Jillian Barrett from Maurice Blackburn Lawyers alleged the woman, who rented the house the party was held at, failed to supervise the party.

Although the woman has been named in court documents, the claim is being made against her insurance policy.

Ms Turkington, who has third-degree burns to 42 per cent of her body, also announced last month she was suing the insurer for $11.8 million.

"What a lot of people don't realise is that home and contents insurance doesn't just cover your belongings," Ms Barrett said.

"It also protects people that you invite into your home because what happens on your property can ultimately be your responsibility.

"He's never going to recover from his injuries. He's suffered excruciating pain ... he'll need a lifetime of care and assistance and treatment."

'My skin was so thin and fragile'

Mr Richards was in hospital for 36 days, experienced 11 surgeries and attended physio three times a week for two years.

His skin no longer stretches, and he does not have sweat glands, which means he can overheat quickly.

He had a bright future ahead of him and was in an accelerated learning program at school, which would have given him automatic entry into university.

Matthew Richards in hospital wearing a face mask over burns. ( Supplied: Johanna Way )

A career in physiotherapy was planned, but Mr Richards is now working in a pub.

"I've missed six months of school and managed to graduate but my OP was nowhere near what I was expecting," he said.

"I wanted to be a physio but the burns mean I have lost the strength in my hands that the job requires so that opportunity is gone," the 18-year-old said.

"My skin was so thin and fragile. I couldn't even go near the dog to give him a pat in case he jumped up and scratched me."

Mr Richard's mother Johanna said the burns had taken a toll on the family.

"The first thing you think when you see your child like that is: is he going to live? - that's the most important thing," she said.

"It was horrific, just devastating. When Matthew came home he was covered in dressings and couldn't even stand up on his own."

She said even basic tasks were difficult — it could take up to three hours just to shower.

Ms Way had to cut her nails and wear gloves, fearing a touch would damage his fragile skin.

"He's was so determined to get better and get out of the hospital," she said. "I'm really proud of him."