Insulation assembly

An insulation assembly comprising, in combination, at at least one longitudinally extending fibrous glass batt, said fibrous glass batt having opposed surfaces, said batt being constructed of a low density, binderless fibrous glass wool, said fibrous glass batt having a density of less than 0.60 p.c.f. (9.61 kg/M.sup.3), an exterior layer covering said fibrous glass batt, means for restricting relative movement between said batt and said layer and air passage means in said exterior plastic layer for directing atmospheric air to said batt, wherein said assembly has a recovery ratio of at least 6 to 1.

An insulation assembly, comprising, in combination, at least one longitudinally extending fibrous glass batt, said fibrous glass batt formed from glass fibers having a mean length weighted fiber diameter of less than 0.00027 inch (6.86E-6 Meters), said fibrous glass batt having a density of less than 0.60 p.c.f. (9.61 kg/M.sup.3), an exterior plastic layer defining a package and having a thickness between 0.20 mil and 0.6 mil, an adhesive on said plastic layer adjacent at least one surface of said fibrous glass batt, whereby relative movement between said plastic layer and said fibrous glass batt is retarded and at least one opening in said package for admitting atmospheric air to said fibrous glass batt, said insulation assembly having a recovery ratio of at least 6 to 1.