JM Spider® Loose-fill fiber glass insulation for drill-and-fill offers smaller fibers to fill tight spaces around pipes, wires, electrical boxes and other cavities to maximize thermal performance.
JM Spider insulation offers many big advantages over cellulose in drill-and-fill applications. Incredibly easy to install, it's convenient and saves time, while offering superior thermal and acoustical performance. JM Spider meets new Building Performance Institute (BPI) standard for dense-pack wall applications. JM Spider also provides up to 30% better air resistance than cellulose when installed at recommended densities for site-built construction. Our unique design enables the fibers to more effectively fill tight spaces around pipes, wires and electrical boxes. For example, JM Spider will fill 2x4 cavities up to an impressive R-15 thermal rating and 2x6 cavities up to R-23. In addition, because fiber glass is naturally mold-resistant, it does not encourage the growth of mold or mildew.