Kent County Council has temporarily closed four schools in following safety concerns over concrete used in their construction.
The council said they had to be shut after it being informed of new guidelines on reinforced autoclaved aerated concrete (RAAC) by the Department for Education and acknowledged it would be 'extremely disruptive'.
A DfE spokesperson said the safety of pupils and staff was paramount.
The council said it expected some of the affected schools to reopen on Wednesday 21 June.
The spokesperson added the council was working closely with the schools affected, some of which are academies or voluntary aided and operate independently.
'This is to ensure that, wherever possible, we can provide temporary accommodation, to ensure that there is as little disruption as possible to the education of the children and young people affected.'
A DfE spokesperson said: 'We are in regular contact with the schools and the responsible bodies including Kent County Council and are working closely with them to minimise the impact of closures and ensure continuity of education for pupils.'
Rory Love, the council's cabinet member for education, told local radio there were new standards and guidelines for the size of the bearings for the ceilings where the roof fits to the walls.
He said: 'This is about about complying with the new standards so we can guarantee that safety in the long term'.
