I have to agree w/ pontiacgp and and your dad is overreacting on your behalf. The problem occurs when air pressure, power washing, grinding, sanding, or painting gets particles air born. Quite honestly I would bet the mask you are wearing is probably not rated to be used with asbestos, you need a true respirator. My father died from this and don't wish it on anybody. I was diagnosed with it last year and hopefully can be kept it in check. That being said anything you do to protect yourself is a plus !!