That's a very scary thought, from my point of view.Going back about 18 years I did a lot of work for a construction firm who happily drilled those sheets for fixing.
They also used to cut them to size with a 5 in grinder/cutter - the only protection being a dust mask. X(
Another one they used to do was cutting the old asbestos guttering in the middle of two houses when replacing one side.
I know some asbestos is more dangerous than other - I take it the roof sheets and guttering are made of the dangerous stuff. :_|
The highlighted is a common urban myth.
All asbestos is equally dangerous.
However, it is the form that it is found which makes it less dangerous.
Exterior works do require less control measures than internal due to the natural ventilation! Yes seriously!
Asbestos cement products, guttering, roofing sheets etc. are less dangerous as the fibres are bonded and the "glue" tends to weight the fibres thus they don't travel so far, also it changes their geometry thus they can't travel so well into the deep lung areas.
Asbestos is completely safe if undisturbed.
In the HSE offices in Cardiff the last time I was there asbestos stickers were everywhere, typical 60/70's building.
They have not stripped it out as it is quite safe when in place.
The really dangerous stuff is the lagging type asbestos as the fibres are in natural form and free to fly around as it were.
When I was an apprentice one of our jobs was to hack the lagging off the pipework & stuff for the fitters & sparks to get at the bits underneath, hammer & chisel were the order of the day & PPE was for wimps!
So I have spent hours hacking lagging off!
Another common misconception is that cleaning up the asbestos dust with a vacuum is OK. WRONG! The fibres are so small they go straight through the machine & its filters and are too small to be spun out of a cyclone type machine. They are then dispersed into the operators breathing zone and into the general atmosphere! The ONLY suitable vacuums are those with the correct asbestos rated filters, a variant of HEPA I think but NOT the std. HEPA type IIRC, would have to check.