Plumbers are not roofers. When a plumber gets on a roof, he is taking a very serious risk.
Chris Elmore highlighted how one roofing incident cost over $120,000 in this post >> Worth It? I put together a short video on the topic as well.
You need to stay safe and healthy. I strongly recommend that you consider updating your policy and safety training about getting on roofs.
If you can avoid the roof access by adding a clean out, it’s a better choice.