Renovations have also exposed problems with school buildings.
In 1999 and 2001 extensions made to the library and administration buildings revealed leaky building problems and temporary repairs were carried out at the time.
The school has also had to build sewerage pipes above ground to combat pipe breakages under ground.
Now, the results of a site renovation programme have revealed serious problems in the foundations of the school's main two-storey block, art and technology buildings.
Mr Havill said a decision had been made to demolish the buildings and start from scratch again.
The school, which has almost 1300 students enrolled, has not yet ruled out shifting site and building on new grounds.
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