Cockermouth School is one of the schools affected by the use of a certain type of concrete which is prone to collapse.
Over 150 schools, colleges and nurseries in England have been told they must close buildings which have used reinforced autoclaved aeriated concrete.
The lightweight material and was used in roofs, walls and floors between the 1950s and 1990s.
A letter to parents from Cockermouth School said it had been aware that a small amount of the concrete had been used and it was working with the Department for Education to make sure the risk was effectively managed.
Four locations have been identified as having the concrete and as a result, four specific corridor locations, the library and sports hall will not be accessible while the school pursues further specialist advice.
It also means that students, due to return on Tuesday, will now not start the school year until Wednesday.
Richard King, headteacher, said: “We are making precautionary adjustments in line with the newly announced national measures so that all students and staff continue to have confidence in the safety of our school. We have plans in place to open our school to all students on September 6; taking an extra day to ensure all staff are well informed and prepared accordingly.
“Thankfully, only small amounts of RAAC are present and we will be able to operate our school with some practical adjustments in place.”
Cheaper than standard building material, 572 schools have been identified where it may be present, 65 confirmed to have had it and 24 needed immediate attention in a National Audit Office report in June.
But new information has come to light which has prompted the Government to say that 156 schools were immediately affected.
The Government is not releasing a list of the affected schools, but parents and carers will be alerted.
