The 48-year-old, from Barking, who does not want to be named, damaged the radius bone in his left elbow in the incident at the company's site at Cody Road in Newham on 12 June 2012.
Iron Mountain (UK) Ltd was prosecuted by the Health and Safety Executive (HSE) after an investigation identified that the ladder he was using wasn't fit for purpose.
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Westminster Magistrates' Court heard the step ladder collapsed as the worker tried to reach the upper level of a racking system, sending him crashing at least a metre to the floor below. He was unable to return to work for several weeks.
HSE established that the ladder was in a poor condition and was critically weakened by a crack that eventually caused it to fail.
The court was told it was one of two step ladders available to staff that had deteriorated beyond the point of safe use. Had both been replaced as was necessary, then the incident could have been avoided.
Iron Mountain (UK) Ltd, of Tooley Street, London, SE1, was fined £5,000 and ordered to pay £8,940 in costs after pleading guilty to a single breach of the Work at Height Regulations 2005.
(CD/JP)
