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  2. A metal building insulation liner system is a high R-value fabric liner system that utilizes the full depth of the purlin cavity. The first layer of unfaced insulation is installed between and parallel to the purlins. The second, unfaced layer of fiberglass is installed above and perpendicular to the purlins, from eave to eave.
    www.service-partners.com/metal-building-products…
    The liner system insulation assemblies are superior to the traditional methods of insulating because they address five crucial problems typically associated with over-the-top installations: creating space for insulation expansion, insulation compression, placement of vapor retarder, proper sealing of the vapor retarder joints and condensation control.
    thermaldesign.com/techinfo/newsMain/liner_syste…
    Defines the liner system metal building roof assembly in Chapter 2 Definitions in the 2021 IECC. 1. a continuous vapor barrier liner membrane that is installed below the purlins and that is uninterrupted by framing members. 2. An uncompressed, unfaced insulation resting on top of the liner membrane and located betwen the purlins.
    www.thermaldesign.com/techinfo/codeanalysis/
    With a metal building liner system, the purlin and or girt cavity is filled, allowing the maximum amount of fiberglass to be installed while helping to reduce thermal bridging at the purlins and the girts.
    www.idi-insulation.com/liner-systems/
     
  3. Metal Building Insulation Liner Systems - Service Partners

     
  4. Energy Code Insulation Solutions in Metal Buildings

    WEBApr 10, 2019 · Liner System (LS): A system that includes the following: 1) A continuous vapor barrier liner membrane that is installed below the purlins and that is uninterrupted by framing members. 2) Uncompressed, …