Which fiberglass form is usually marketed as sheets or panels to fit into framed cavities?

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

Answer: (B)

Fiberglass insulation designed for fitting into framed cavities is typically produced as pre-formed panels. These sheets come pre-cut to standard widths so they can slide between studs with minimal trimming, giving a snug fit and reducing gaps that would let heat escape. This form makes installation faster and helps maintain consistent R-value across the wall cavity.

In contrast, wrap is not insulation itself but a protective or vapor wrap; boards are rigid panels used in other applications and aren’t the common sheeted form for cavity filling; batt insulation refers to the traditional flexible blanket or roll that you cut and fit between studs, which isn’t described as pre-formed panels.