A three-metre roof fall which left a 30-year-old man with serious back injuries has cost a Lincolnshire firm nearly £5,000.
Timmins Engineering and Construction Ltd admitted two health and safety at work breaches at a Lincoln Magistrates' Court hearing yesterday.
The firm, based at Sturton-by-Stow north west of Lincoln, was fined £4,000 with just under £1,000 costs.
Magistrates were told by the Health and Safety Executive that the employee, from Scampton, fell through the roof of a farm building being renovated at Osgodby, near Market Rasen.
The court heard that the man fractured a vertebra and had to have metal plates inserted in his back as a result of the incident on January 17 this year.
He fell while replacing roof sheets with a colleague, slipping from a crawler board and stepping onto one of the cement sheets which was being replaced with a steel version.
The HSE prosecution said it had established that, although both workers were working to a pre-planned method of work, it was inherently unsafe - and failed to mitigate the risks of working with fragile materials.
Timmins Engineering and Construction of Tillbridge Lane, Sturton-by-Stow, was fined £4,000 and ordered to pay £985 in costs after pleading guilty to two separate breaches of the Work at Height Regulations 2005.
After the hearing, HSE Inspector Chris Copeman said: "The worker sustained a serious injury that could have been avoided had a safer system of work been used for removing the fragile sheets.
"The risk of serious or even fatal injury is high and eminently foreseeable with this type of work, and it is vital that the correct equipment and methods are in place.
"The company eventually got it right by working from inside the building and avoiding the need to physically go onto the roof, but it is sad that it took a serious incident before this happened."