York Castle Museum has now completed a full review following the discovery of collapse-risk concrete in part of its roof.
We reported last month that the venue had to partially shut after finding Raac (reinforced autoclaved aerated concrete). It is a building material now considered to be in danger of collapsing.
The north side of the museum, which houses Kirkgate, the Period Rooms and Shaping the Body, has been closed since the Raac was identified.
The York Museums Trust, which runs it, has now completed surveys of the roof.
A trust spokesperson said: “The survey has identified the need for mitigating work in some areas which will need to be undertaken over the coming weeks.
“This work will ensure that all roof supports reflect the most up-to-date structural guidance.”
Until that is completed, the north side of the building will stay closed.
“Sadly, this means that the Ghost Count will be cancelled, which was scheduled to take place between 28 October and 5 November,” the spokesperson added.

“We will be in contact with anyone who has pre-booked a ticket to the After-Hours Ghost Count event on Friday 3 November or who has pre-booked a daytime ticket over half-term.
“The Debtor’s Prison After-Hours Ghost Tour is unaffected and is currently fully booked.
“We will be offering a half term programme for families in our other spaces, details of which will be published shortly.”
The unaffected parts of the museum, including the original Prison Cells that once held notorious highwayman Dick Turpin, outdoor spaces, the swinging Sixties Gallery and the First World War Gallery remain open.
The café and shop are also open as usual. A reduced rate entry is on offer.