Rope and Harness equipment is used when accessing the roof is difficult or may require fall protection due to limited valleys or nothing to grab onto. Depending on the type of damage adjusters may have to access multiple parts of a slope to verify if there is damage or not. There are other tools besides rope and harness like the GOAT and RidgePro. Personally I know that if I am tied off to a tree or vehicle that object will not move with my body weight. Others may prefer the versatility and convenience of other tools.
http://amzn.to/2mGUqoN – Belay
http://amzn.to/2ni6JcO – Static Rope
http://amzn.to/2nnPHXo – Carabiner
http://amzn.to/2mmlaaV – Ascender
http://amzn.to/2mUIRLl – Harness
http://amzn.to/2n3E0I5 – Nylon Runner