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Following notification from Westminster City Council that the failure of historic hessian wadding ties might be implicated in the collapse of the ceiling at the Apollo, theatres and other historic buildings have acted accordingly says the Society of London Theatre.
Westminster Council has said that the collapse of the ceiling of the Apollo Theatre in Shaftesbury Avenue last December was caused by the deterioration of century-old cloth and plaster ties holding up timber frames.
The incident during the Curious Incident of the Dog at Night Time injured 80 members of the audience when 10 square yards of plaster plummeted on to the stalls below, and forced the closure of the grade II-listed theatre.
The ties, made of hessian and plaster of Paris, were used to lash together timber frames to support the suspended ceiling and had been in place since the theatre opened in 1901.
The Apollo will re-open this week for the first time since December 19.
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The Victorian wadding, made of a mix of thick hessian and plaster of paris had detoriated - but theatre now safe to open says council.