Asbestos causes lung disease. Do you know if your home has it? How can you be certain? If I am going to do any major work on a home that is likely to contain asbestos, I have it tested. If the sample is negative, the job is then cheaper, if it is positive, I know that I have to take particular care - simple!
Does your house contain asbestos? Does your trades person know what they are doing? How do you protect your family against exposure to asbestos dust?