Posted By Ken Taylor I would treat all such as fragile and use protective measures. However, you could consult Appendix 4 to HSG33 and HSE Specialist Inspector's Report No. SIR30. Even if designed to support the weight of a person, the unknown factors will include UV degradation, impact, chemical or heat damage and corrosion to supports or fixings.

Posted By Karen Todd Hi Eamon, Safety rooflights are now widely in use, although sunlight degrades them. I believe that 20-30 years is the range for non-fragility, but the manufacturer would be better able to advise. I know I never walked over rooflights - safety rooflights or not, but I am the kind of person who won't even walk over a manhole cover and have been told I will never make a roofer (i.e. I don't take risks)!!! The BS for rooflights is BS EN 1013 I think. I've sent you a picture of safety rooflights, and also a copy of the Advisory Committee for Roofwork's Best Practice Guide, which states, "Before commencing any work on any existing roof it is absolutely essential that you find out whether your roof is fragile or non fragile. This is a key decision, which should only be made by persons competent to do so. If there are any doubts, assume that the roof is fragile". Regards, Karen