I'm currently converting my garage into a gym but I'm slightly concerned about the presence of asbestos. The garage was previously a house I would say probably pre-1900 and there are patches of plaster that is covering brickwork. It's in really bad condition and even touching it would cause it crumble. To add to this, there is virtually no ventilation. Is it possible there is asbestos in the plaster? what about in crumbling cement?