I am getting ready to do a full gut on one side of a duplex I just purchased. What are some things we should keep in mind before and during the gut? One thing I found was what seems like old blown in insulation in the attic. The home is aroujd 100 years old. Is there a danger of this insulation being asbestos? I'm not trying to spend a ton of money on this rehab, but if there are any potential issues like this we would run into, would love some advice to know how to handle them.