Prefabricated insulation for HVAC ductwork and other fluid conduits

A method of installing a plurality of prefabricated sheets of flexible fibrous insulation blanket with jacket onto HVAC ductwork or other fluid conduits comprising:

• (a) providing a prefabricated insulation for HVAC ductwork and other fluid conduits having one longitudinal edge jacket-flange and one circumferential edge jacket-flange with self-sealing tape with release strips on both the longitudinal and circumferential jacket flanges undersides;
• i) with each sheet having jacket tabs with self-sealing tape with release strips, with release strip removed from ½ the length of each tab with ½ the length of each tab adhered to the non-flange end of the sheet;
• ii) with each sheet having metal or plastic attachment prongs, pins, or anchors in the non-jacket-flange longitudinal end jacket and or in other locations on the sheet, such as locations to prevent sagging in the blanket sheets.
• b) removing the release strips from the self-sealing adhesive tabs on one sheet, placing the sheet onto the ductwork and adhering the tabs to the ductwork surface.
• (c) placing said sheet around said ductwork and removing the release strips from the self-sealing adhesive on the longitudinal end jacket-flange of the sheet and adhering the jacketing-flange to the abutting jacket surfaces.
• (d) impaling the metal or plastic prongs, pins, or anchors on the sheet through the overlapping jacket-flange and securement of said jacket-flange by folding or attaching the metal or plastic prongs or anchors, tight against the surface of the jacket-flange or other securement on other jacket surface.
• (e) applying additional prefabricated sheets in succession onto ductwork or fluid conduit with the circumferential jacket-flange overlapping the circumferential end of the previously applied sheet removing the release strip from the circumferential jacket-flange and adhering the circumferential jacket-flange to the abutted sheet jacket to accomplish complete insulation of ductwork or conduit system.