cheers! by roof material do you mean the corrugated sheet? 90% sure it's galvanised steel but doesn't look like it on these photos.
It could well be but in buildings that age and that standard then corrugated asbestos re-enforced cement sheets are a distinct possibility. Looks like this:
Its not an issue unless it is disturbed.
don't worry – it's definitely a new(er) steel replacement
@Bobbo started
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cheers! by roof material do you mean the corrugated sheet? 90% sure it's galvanised steel but doesn't look like it on these photos.