A batt in construction is pre-cut piece of insulation, typically fiberglass or mineral wool, manufactured in flat rectangular panels or rolls designed to fit between studs, joists, and rafters in walls, floors, and ceilings. Batts are commonly made of fiberglass with kraft paper facing or unfaced, available in standard sizes to fit 16 inch or 24 inch on center framing, with thicknesses providing different R-values for thermal insulation. In construction, batts are used to insulate exterior walls, attic floors, and crawl spaces, providing thermal resistance and some soundproofing. Installation involves fitting batts snugly between studs without compressing, ensuring no gaps. Batts are distinct from blown insulation which is loose fill, and from rigid foam boards. Term batt comes from batting, similar to quilt batting. Batts are popular because they are relatively inexpensive, easy to install DIY, and widely available at hardware stores. Proper installation of batts is important for energy efficiency and preventing air leaks and moisture issues in building envelope.
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