We highly recommend Cellulose Insulation. It is treated with a non-toxic borate solution that gives this material a Class-1 fire safety rating, the highest rating available. It also means that this will be both mold and pest resistant. Cellulose also offers a superior R-value compared to traditional fiberglass insulation. Cellulose is more durable, and won't compress, ensuring its effectiveness over time. Cellulose is also considered a "green" product. It is primarily made from recycled newspaper. The eco-friendly nature of the material combined with its energy efficiency makes it a great choice for homeowners who are concerned about the environment.