Ulysses wrote:
"George E. Cawthon" wrote in message
...
((snipped))
After the inspection, I would remove it and
install a sheet of thin aluminum as a shield held
2-3 inches above the horizontal pipe. It should
be slightly curved and can be held on the pipe
with thin aluminum struts. That will provide
much more safety than the asbestos sheet. The
asbestos sheet will get hot and will transfer heat
to the ceiling structure.


My experience with asbestos is that it does not transfer heat. Aside from
being virtually impenetrable to flames this is one of the reasons is was
such a wonder material.

The shield will not

Asbestos doesn't burn and it does have insulating
properties, but it does transmit heat.

Let's see, the ceiling is directly over the pipe
which could be 300 to 500 degrees and radiating
heat like mad. When that radiated heat strikes
the asbestos sheet what happens. Some is
reflected some is absorbed some is reradiated.
This is a continuous process for hours, not short
term. The sheet will reach a specific temperature
and the back of the sheet against the ceiling will
be that temperature, which may be high enough to
damage the wood structure. It is nice that
asbestos doesn't burn but it won't stop wood
charing and damage on the back side if the front
side is heated high enough for a long enough time.