PHILADELPHIA - When you buy a home, you should be aware of asbestos. In most states, a seller must disclose this substance's presence. However, they are not legally required to fix it. Therefore, it's important to raise the issue during the negotiation process. Otherwise, the seller may be reluctant to spend additional money to fix the problem. Additionally, other prospective buyers may be wary of the property due to its asbestos siding. This makes it important to discuss your concerns with your agent and the seller.