Roof Walkways

You own a large warehouse. The air conditioning needs a service and the solar array needs a clean, so a tradesperson has to walk across a wide steel roof lined with long rows of skylights. Someone has quoted you a horizontal lifeline as the cheaper way to get them there, and on paper it looks like a smart saving. Here is the problem with that saving. A horizontal lifeline, or HLL, and a walkway with skylight mesh are not a budget version and a premium version of the same fix. They solve the problem in completely different ways, and only [...]