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The Easy Handling and Installation Option. Fiberglass batt & roll insulation options are common because they are so easy to install. Batts are pre cut sheets of fiberglass insulation, and rolls are simply longer versions of batts. Both are designed to slide right into cavities between wood frames. They are useful for controlling temperatures, acoustics, and lowering energy costs. And they can be installed just about anywhere, from your attic to your floor.