Do you have any info, drawings, plans etc from when you bought the property? They might show what the material is- your local Council may have more info as well.

We bought a 60s warehouse and decided to replace the roof, which was asbestos. Contrary to what seems to be popular opinion, it wasnt as expensive to remove and replace as we were lead to believe by others..and we had to get a crane and put scaffolding up on the street level.

We were told asbestos is only a problem if its been damaged- then the fibres are airborn..

***super_nova***, are you looking to replace your roof because its damaged?