Which form is sold as blankets or batts suitable for insulating wall cavities and attics?

• A. Board
• B. Wrap
• C. Pre form
• D. Batt insulation

Answer: (D)

Batt insulation is the form sold as blankets or batts and is designed to fill wall cavities and attic spaces. It’s made from fiberglass or mineral wool and comes as flexible sheets that fit between studs or across joists. This form is ideal for cavities because you can cut and fit it around wiring, outlets, and other obstacles, providing continuous coverage with relatively low cost and straightforward installation. The insulating value depends on material and thickness, so adding more thickness increases R-value, but avoid compressing the batt, since compression reduces its effectiveness. In walls and attics, batt insulation is a common choice, often used with a vapor barrier where required by climate. Other forms, like rigid boards or wraps, serve different purposes and aren’t described by blankets or batts.