A youth who caused £2.6m damage when he set fire to his school has been given 18 months detention.
Fourteen classrooms and two science labs were destroyed
The 15-year-old, who cannot be named for legal reasons, had previously admitted causing reckless arson at the Pingle School, Swadlincote.
He had been playing with a lighter and an aerosol when flames spread to 14 classrooms and two science labs.
Stoke Crown Court heard it had been a break-time prank which escalated. No one was injured.
About a quarter of the school was destroyed in the fire in December 2005.
Some of the 1,300 pupils were able to attend school only four days a week until temporary classrooms were erected.