Insulation installers apply fiberglass, mineral wool, foam, and other insulation materials to building interiors for thermal and acoustic performance. Trade training typically includes 2-3 year apprenticeships. Work includes batt insulation, blown-in loose-fill insulation, rigid foam, spray foam, and acoustic panels. Installers must understand R-values, vapor barriers, and building envelope principles. Typical hourly rates range from $25-$55. Union insulation workers may belong to the Laborers union or IUPAT depending on region. Specializations include spray foam, dense-pack cellulose, and specialized acoustic products. Safety knowledge includes proper handling of fibers and PPE requirements.