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Faced vs. Unfaced Fiberglass Insulation: Which is Better for Soundproofing?

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  The product looks similar. Pink. Yellow. White. Fibrous. Compressible. Yet one has a paper-like layer. The other does not. This layer is not packaging. It is not accidental. It is intentional. It changes everything. Fiberglass sound insulation is available in two distinct configurations: faced and unfaced. Specifiers who ignore the distinction risk moisture damage, acoustic failure, and code violations. This report establishes the difference clearly. No marketing. No ambiguity. The Facing Defined Faced fiberglass sound insulation includes a membrane attached to one side. This membrane is typically kraft paper, foil, or plastic film. It is bonded during manufacturing. It is not removable. The facing serves multiple functions: Vapour retarder: moisture migration control Air barrier: prevents airflow through insulation Mechanical protection: contains fibres during handling Reflectivity: foil facings reduce radiant heat transfer Unfaced fiberglass sound insulation has no membrane....
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Is Spray Foam Sound Insulation Good for Sound Insulation?

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  The question appears circular. It asks whether spray foam sound insulation is good for sound insulation. The repetition is intentional. It reflects confusion. Many products claim acoustic performance. Not all deliver. Some are marketed as sound insulation but function primarily as thermal insulation with minor acoustic side effects. Spray foam sound insulation occupies a specific category. It is not a universal solution. It is not useless. It is not magic. It is effective for certain problems and ineffective for others. This report establishes the boundary conditions. The Distinction: Absorption vs Blocking Sound insulation has two meanings. This is the source of confusion. Blocking Preventing sound from traveling between spaces. Wall to wall. Floor to ceiling. Room to room. This requires mass: Concrete Lead Gypsum Steel Heavy materials resist vibration. Spray foam sound insulation adds mass. Not as much as concrete. More than air. A 50 millimetre layer of closed cell foam add...
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