The man, an employee of Mitchell Roofing, was replacing panels when he slipped and fell 7 m through the inner roof sheet fracturing his skull, York Magistrates’ court heard.
The company had been contracted to replace rooflights at Monk Bridge Construction’s premises in Elvington, York.
Before the incident, the firm had clad a new building and had taken the appropriate safety precautions, but the minor work of replacing the roof panels had not been properly planned.
An investigation by the Health and Safety Executive (HSE) found there was no risk assessment , and no precautions had been taken to prevent falls from the edge of the roof or through the fragile elements which included the inner roof sheet.
Mitchell Roofing was fined £10,000 after being found guilty of breaching sections 2(1) and 3(1) of the Health and Safety at work act.