Firefighters could be seen on the roof at Taupō-nui-a-Tia College during the fire. Photo: LES WILLS / SUPPLIED

A firefighter clambered on to the side-roof of a burning building at Taupō's largest school after the ladder-truck that hoses down fires from height broke down.

The fire that gutted a two-storey block of classrooms at Taupō-nui-a-Tia College resulted in arson charges laid against two young people.

After the first ladder-truck - called an 'aerial' - from Rotorua broke down as it set up the hose on its boom, another large ladder-truck was rushed in from Hamilton almost two hours away.

In the meantime, "firefighters successfully used other tactics to contain the fire to the building of origin and protect all neighbouring structures", Fire and Emergency said.

The Professional Firefighters' Union said such a delay mattered at fires of this scale.

Firefighters working at Taupō -nui-a-Tia College. Photo: LES WILLS / SUPPLIED

A video posted online showed the firefighter on the roof hosing through the second-storey classroom windows for about a minute as flames billowed out and began to consume the roof at the other end, before he got down on a ladder held by another firefighter.

Taupō retiree Les Wills was watching.

"It didn't look very safe at all," he said.

"I think other people around me were thinking pretty much the same sort of thing."

He'd seen online commentary he agreed with, that it was "dumb but brave".

FENZ deputy national commander Megan Stiffler said firefighters were trained to use various tactics.

"Firefighters can apply a range of tactics, including using hoses at height to direct water onto a fire," she said.

"Doing this from an aerial appliance or from a roof are both tactics which an incident commander may consider, depending on the circumstances, the type of incident and the resources available."

They also applied the so-called safe person concept and dynamic risk assessment.

"If one particular type of fire truck is unavailable, they can adapt their tactics to the resources that they have."

Des Chan who was on the Rotorua truck said they got some water to the boom but not enough, and had to adopt a tactic that was "very much" less safe.

He was not referring to the firefighter on the roof, which he did not know about, but having to get very close-in to the flames.

"We were trying to stop the fire spreading to the library next door just across a little gap.

"With the aerial [ladder] we would have contained it completely, as it was we had to stand there, right underneath," Chan, the union's Rotorua local secretary, said.

Firefighters battling the blaze at Taupō -nui-a-Tia College. Photo: LES WILLS / SUPPLIED

Wills had watched the Rotorua ladder-truck crew set up the boom to get their hose in the air, amid other smaller fire trucks and their crews.

"The water came out from behind the cab of the truck and simply flooded the ground. There was a very thin trickle of water came out of the boom itself onto the fire.

"I think what struck me more than anything else was looking at the angst, the anguish, the frustration, if not the actual anger on the faces of the firefighters who had just driven from Rotorua to assist putting out a huge fire and their equipment failed on them."

Union spokesperson in Waikato, Jay Culhane said the boom would have allowed the high hose to penetrate deeply into the burning classroom in a way that ground-based hoses could not.

Stiffler said a sticking valve was the problem, and they had learned this had happened before but not been reported for repairs, and it was "critical" firefighters reported faults.

But Chan said two previous times the boom did not work, the firefighters had checked then restarted it and it had been okay. To report all such faults meant mechanics would be getting a lot of reports, he added.

Culhane said the Hamilton ladder-truck had to be nursed on its emergency run down to Taupō as it regularly overheated and was often laid up for repairs.

FENZ confirmed a second breakdown on Sunday, of the emissions control system in a command-unit truck coming down from Greerton station in Tauranga.

"As a command unit from Rotorua was already at the scene, this second command unit was not required," Stiffler said.

The agency's network approach enabled relief vehicles to be called on "whenever and wherever they are needed", she added.

"All our trucks are maintained in a fully operational condition regardless of age. We have a proactive servicing regime for all trucks and replace any worn parts as required to keep them at an operational standard. These are large, complicated vehicles but they are well maintained, safe, certified, and legally compliant."

FENZ was spending over $20m annually over the next three years on its fleet and $12.5 million on new aerials. Contracts were in place "although we acknowledge this will take some time".

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The fire at Taupō-nui-a-Tia College destroyed a block of classrooms, police say.

Fire and Emergency says crews have managed to contain a fire at a Taupo-nui-a-Tia College to just one structure.

FENZ received 18 calls during today's strike and 10 cases were in areas impacted by the industrial action.

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