Fiberglass insulation is lightweight and cost-effective. This material is commonly used in applications like HVAC, mechanical, industrial, and metal building insulation. Fiberglass insulation slows the spread of heat, cold, and sound to make the structures in your project more efficient. DI offers industrial, commercial, & residential fiberglass insulation in a variety of products such as blankets, boards, duct liners, and more. You can browse our selection of fiberglass insulation below.