Loose-fill fiberglass insulation can contain toxic materials such as formaldehyde and asbestos that can leach into the ground and damage ecosystems, so never toss insulation in the garbage. Dispose of it as hazardous waste. 

Insulation can cause irritation or damage to your skin, eyes and lungs. In addition to thick work gloves, safety goggles and a dust mask, wear long, loose layers you don’t mind tossing afterward, and keep your head covered as well. If insulation touches your skin, don’t rub it. Wash it thoroughly instead.

Use thick, durable plastic bags, also known as contractor bags, to dispose of insulation. Once you’ve filled a bag, place it inside a second bag to keep it extra secure.