I am carrying out a review of WAH on a multi building site, we have 2 large flat concrete roof areas, 2000m2 each, that have 'lifeline' work restraint systems, the lines pose a trip hazard that is 2metres from the edge the roof edge has a low parapet approx 250mm high, we have a 2m rule regarding access, however i think it looks wrong! access onto the roof is via a permit although i often see individual maintenance operatives working on the roof, well away from the edge, a passive edge protection double handrail is my recommendation for improvement, however i have read HSE roof work guidance and it is not a legal requirement!

Jason, I worked with a similar issue but our roof was only accessed once a year so a safety harness was all that was required but if the roof is accessed on a regular basis then point out The Work at Height Regulations 2005, 6(3) & 7(1) (a), otherwise it might be more reasonably practicable to use safety harness and lines.

I must add that the requirement for access onto the 'safe' area of the roof is for A/C units, chiller units 5 seperate units, and the roof incorporates a fire exit route for the plant room itself! the route is dedicated with a non slip footpath across the middle of the roof then down a cat ladder, occupation of the plant room <10 people.