Where possible you should avoid working on a fragile roof by doing the following:
work from underneath the roof using a suitable work platform or where this is not possible, use a mobile elevating work platform that allows people to work from within the basket without having to stand on the roof. If access onto the fragile roof cannot be avoided, perimeter edge protection should be installed and staging used to spread the load. Unless all the work and access is on staging or platforms that are fitted with guardrails then safety nets should be installed underneath the roof or a harness system used. Where harness are used, they need adequate anchorage points. They also rely on discipline, training and supervision to make sure that they are used consistently and correctly. For more information, see [Advisory Committee for Roof Safety ](http://www.roofworkadvice.info/).