What type of insulation material is commonly used in residential homes?

Fiberglass is commonly used as insulation material in residential homes due to its excellent thermal resistance properties and ease of installation. It consists of fine glass fibers and is available in batts, rolls, or loose-fill forms, making it versatile for various applications, including walls, attics, and floors. Its effectiveness in reducing heat transfer helps maintain indoor temperatures, resulting in energy savings and increased comfort.

The other materials listed serve different purposes in construction. Lead is a hazardous material that is not suitable for use in insulation due to its toxicity. Steel is a strong material primarily used for structural support, plumbing, or siding, rather than for insulation. Wood is used in framing and other structural components but does not provide effective insulation properties on its own. Thus, fiberglass stands out as the most appropriate choice for residential insulation.