|The Health and Safety at Work Act and the Construction (Design and Management) Regulations 2007 both require that worker safety should be addressed within the design of a building. This applies during the construction of the building and, once built, its maintenance, repair and demolition.
The HSG33 Health and Safety in Roofwork booklet specifically states that:
Rooflights, including modular units should be classified to:
- 'Where rooflights are required, it is obligatory for designers to consider: Specifying rooflights that are non-fragile.
- Fitting rooflights designed to project above the plane of the roof and which cannot be walked on (these reduce the risk but they should still be capable of withstanding a person falling onto them).'
For Non-Fragility of Profiled Sheeted and Large Element Roofing Assemblies’, Edition 4—the “Red Book”.
Consideration to prEN1873 is also required (using 1200 joules energy rating). Barrel vaulting and patent glazing derivatives can also be classified but will require negotiation with the customer.
Rooflights are not intended for walking on and the fragility criteria relate to accidental access -clearly this should be avoided and discouraged. Even non-fragile rooflights are susceptible to damage by impact and are not usually intended to support foot traffic -crawling boards must always be used.
Micro scratches can affect the thin UV protective layer resulting in deterioration over time, potentially rendering ‘non-fragile’ rooflights fragile. Therefore, any rooflights which have been impacted should be replaced -which is why it is unrealistic for rooflights to be classified as ‘Class A’ (i.e. “no signs of significant damage that will affect the long term strength" following the test).