CAn't answer your question, but...
The first time I spend time on my roof, which is less steep than the
ones they are talking about, I had to do very little walking, to put
in a roof fan. But while sitting there, I was so afraid of moving
and rolling over and off that after the hole was cut, I couldn't find
the fan. It turned out it was right behind me but I was too scared to
turn far enough to see it, in either direction. I thought I would have
to go down the ladder again to get it.
Even though the job involved no hard work, and not much light work,
the next day and for a couple days, I was sore all over, from the
constant tension of not moving.
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