Ease your worries. Asbestos does not harm by being near people, like radioactive waste. The damaging parts are small airborne particles that are like little barbed spears that lodge in the tissues and can not be absorbed by the body, causing the body to try to surround the irritation. As long as the roof is 'sealed' and particles can not float through the air or be touched, they can do no harm. Ask for the certification that was given to the authorities that the job was done according to the EPA guidelines.