How can we make roofs safer?

摘要

The fragility of a roof, and of roofing materials, has been the subject of much debate and effort for many years.rnManufacturers of both sheeting materials and roof lights proudly claim "non-fragile when new," or reference fragility-test evidence. But all still accept that the vast majority of roofing stock out there is dangerous to walk on. They all recognise that the materials deteriorate over time and their fragility increases.