Personally I think there is a lot of scaremongering going on in regards to asbestos sheeting.
I don't doubt for a minute that asbestos is a very dangerous product, however I think the dangers are a lot lower than people are led to believe in asbestos sheeting.
Take care by all means but there is no need to be frantic about it.
I am 47 and at a very young age we spend hours over many weekends throwing bits of asbestos sheeting into a fire, where we had a holiday home, just to watch it explode! Touch wood I am not dead yet!
This is just my personal opinion.