Jackets contain and protect insulation, which can lead to a longer lifespan of the mechanical insulation itself. Jacketing is also essential for weather and water-proofing insulation materials. Jacket materials include PVC, stainless steel, and aluminum, of varying thicknesses based on application.
Jacketing serves to protect the insulation itself, and contributes to the overall thermal conductivity. Jacketing can serve as a vapor barrier, weatherproofing, and UV protection, which can degrade insulation through exposure.