Many people with bricklaying or carpentry training may find that they have to work from heights from time to time.
Now, the Health and Safety Executive (HSE) has warned of the danger of working on or maintaining a fragile roof.
Recently, a Scottish company was fined £6,000 after a 19-year-old worker fell ten metres into an occupied factory while carrying out maintenance work.
HSE inspector Alastair Brown said: "Both contractors involved failed to recognise the risks posed by the presence of fragile rooflights on this building, or do establish their fragility prior to work beginning.
"The measures which should have been taken to prevent this incident happening were straightforward and well documented."
The 19-year-old who fell suffered serious injuries as a result of the rooflight giving way.
Just last month the HSE urged construction workers to make sure that they were safe when working form heights after a man fell from scaffolding in the Hastings area and died.