FIELD: heat insulation of metallic envelopes forming gas duct of power plants. SUBSTANCE: heat insulation includes mats of fibrous material and protective sheets in the form of box covering mat and having on two adjacent sides beads parallel relative to box plane. In zone of said beads box has at least two flat struts arranged normally one relative to another and secured to heat insulated envelope. Plane of box hangs at least over one bead forming together with it seat for holding one side of adjacent box having no beads. Mat and box are secured to heat insulated envelope only in two points by welding. EFFECT: simplified designs of heat insulation and heat insulated envelope, lowered heat transfer to envelope. 2 dwg
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