Safety net systems are used throughout the roofing industry on both steel and timber structures as a primary means of passive fall protection and also leading-edge protection to mitigate the consequences and distance should a fall occur. 

Nets should be positioned as close as possible to the underside of a working level to minimise the height of a fall but should never be more than two metres away. Unfortunately, NFRC has been advised by members of the practice where principal contractors have installed horizontal drainage runs prior to the roof safety netting, forcing safety net riggers to work contrary to the requirements of FASET installation guidance. This situation prevents the netting rigger installing the nets within safe tolerances and introduces an impact hazard within the safety zone between the underside of the working level and the safety net.