A primary school near St Albans has appeared on a national list of schools confirmed to have contained a form of concrete that is prone to collapse.

Markyate Village School and Nursery is one of three Hertfordshire primary schools to appear on the list, alongside St John Catholic Primary School, in Rickmansworth, and Widford School in Ware to appear on the list.

However, officials from Hertfordshire County Council say that remedial work was completed at two of the schools last year, which are operating as normal.

Reinforced autoclaved aerated concrete (or RAAC) is a lightweight material that was used in the construction of schools between the 1950s and 1990s.

It’s weaker than traditional concrete and there have been mounting concerns about its safety.

Last week the Department for Education declared that no school or college known to have reinforced autoclaved aerated concrete ( RAAC) should remain open, unless ‘mitigations’ are in place.

Since then the DfE has come under increased pressure to publish a list of schools with confirmed presence of the concrete.

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Officials say remedial work at the two council-owned buildings – Markyate Village School and Nursery and Widford School, in Ware –  was completed last year and both schools are operating as normal.

The third school on the government list is St John’s Catholic School, in Rickmansworth, which is part of the All Saints Catholic Academy Trust.

RAAC is believed to have been found in a school building at St John’s last year. And although not directly responsible for the academy, the county council is said to be working with the DfE to support them.

The county council surveyed 279 council-owned schools –  built between 1959 and 1989 – for the presence of RAAC in 2020 and 2021.

This was when the material was discovered in Widford School and Markyate Village School and Nursery.

During the same set of surveys it was also found at Bushey and Oxhey Infants School, where remedial work is also reported to have been completed.

Now – in line with government advice – the county council is set to survey up to 100 additional council-owned school buildings that were built between 1950 and 1958 and between 1990 and 1995.

However academies and voluntary-aided schools will be responsible for their own surveys and any subsequent remedial work.