The paper aspect of confronted insulation is flammable and have to not be left uncovered. Protect it with a ending materials which include drywall. Look at our video How to hold Drywall for phase-by-action instructions. Covers the basics of fibrous glass air duct insulation (ductboard / duct board), its part https://tysonoa8e9.blog4youth.com/32588619/building-insulation-installation-an-overview