Barry Tyson, 52, suffered fatal head injuries as a result of the fall whilst he was working to refurbish the flat roof of Aspin Park School in Knaresborough.
Watershed Roofing and one of its Directors, Steven John Derham from Bradford, had appointed Mr Tyson to carry out necessary brickwork on the roof, as part of a scheme to add insulation and re-felt it.
Mr Tyson, a self-employed brick-layer, had been kneeling on the roof working when the incident happened on 16 August 2011.
When he stood up, he fell backwards through a roof-light and into the boys' toilet two metres below.
He was taken to hospital by air ambulance but died later from his injuries.
Bradford Crown Court heard that a Health and Safety Executive (HSE) investigation found Watershed had prepared a construction phase plan which stated before work was carried out, the plastic domes of all roof-lights needed to be removed and the apertures boarded over.
-- Advertisement --
However, when roofers accessed the roof it was found that the domes could not be easily removed.
The court also heard the firms Director Mr Derham visited the site on the first day to check it had been set up correctly.
The difficulties with removing the roof-lights were discussed with the workforce and it was decided works could progress without any covering of the roof-lights.
Watershed Roofing pleaded guilty to breaching section (1) of the Health and Safety at Work etc Act 1974.
The Yorkshire roofing firm was fined £80,000 and ordered to pay costs of over £39,000.
Mr Derham, 47, of Winterton Drive, Low Moor in Bradford, pleaded guilty in his role as Director of the company to a breach of section 37(1) of the Health and Safety at Work etc Act 1974 and was fined £7000.
HSE Inspector Martin Hutton said: "Mr Tyson’s death was entirely preventable. The risks of falling through fragile materials are well known in industry and yet they remain an all-too-common occurrence.
"Control measures are often simple and cheap to install and companies must ensure they are put in place before workers are put at risk.
"Watershed and Mr Derham knew this but allowed work to continue without any protection measures. However, both defendants pleaded guilty at an early stage and have taken remedial action to prevent a recurrence."
(LM/CD)
