A mineral fiber insulation assembly is disclosed. The insulation assembly includes a longitudinally extending mineral fiber core having opposed major surfaces, opposed side surfaces and opposed end surfaces. A low friction polymer film is positioned adjacent the major surfaces and the side surfaces. At least one of the side surfaces is attached to the polymer film. A plurality of openings are provided in the polymer film adjacent at least one of the side surfaces. The insulation assembly is readily compressible and expandable at the job site. The low friction film provides easy installation.

 
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