Hello I have a house in San Francisco that is about or over 100 years old.There is paneling in one room over the plaster took one panel down and found some holes in the plaster from where electrical work has been done first question is do plaster walls have asbestos in them? The plaster looks like it has alot of hair of some sort has grey rock looking material then a white layer then paint. The ceiling plaster has all been taken out and panneling laid over the wood strips that the plaster stuck to should or can I have it replasterd or just have it sheet rocked?