Not quite sure what you want to be released from, but we have customers sign a form releasing us from claiming damage to a roof or wall... even if we caused the damage.
Many years ago, I worked at a shop where we used a boom to put parts of the sign on the roof. Installed the sign and a few weeks later, the customer called the owner... claiming we had created a few leaks in his roof and wanted him to fix it immediately because it was damaging things in his store.
We went out and when we got there, he now wanted us to re-surface his roof. We went inside to see the damage and it was easily recognized as old leaks and nothing new had been created at all. I thought my boss was gonna run his foot clear up this guy's butt and out the other end. Also, the leaks were about 150' away from anywhere near where we were working.
Anyway, he had made up some kinda form which simply stated.... if we are to do work on your premises or property, rented or owned, we are not held responsible for any old or new leaks created by others, our work and even if we created the problems. If they didn't sign this, he told them to go pound sand.
You see, what happens many times is.... a roof or wall might be fatigued and not leaking, but simply walking up there, could quite well cause a problem. The mortar might just fall out from mere vibrations and then you're to be held liable ?? Sure, that's what insurance is for, but with today's con-artists, why be the fall guy and fix someone else's problems ??