As have I and therefore KNOW it is dangerous as you also do given that you identified the danger by giving an example of what to do for "any difficulty". Walking on a tar-papered 12/12 roof IS inherently dangerous.
I guess "dangerous" is relative...I've seen more guys electrocuted then have fallen off.
I consider falling off a roof "dangerous", guess that's just me...
Roofing work is inherently dangerous, what we are discussing is what that particular roofer is doing and what I'm saying (as an ex-roofer) is there many more dangerous things you can do up there than his shingle transfer method.
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