Insulation Overlays (Water-shedding Systems)

Accepted Materials for a RoofStar Guarantee The tables and products shown below provide basic material data and links to more information about the materials, including manufacturers' published Technical Data sheets, but this information is not intended for use as a comparison of material performance or quality. It is the sole responsibility of the Design Authority to assess the performance capability and material suitability for specific design requirements. The materials listed are those which have been accepted by the RoofStar Guarantee Program (RCABC Guarantee Corp., or RGC) for use in a roof or grade-level waterproofing system that will qualify for a RoofStar Guarantee. The acceptance of these materials by the RGC (RoofStar Guarantee Program) in no way reflects on the quality or performance of other materials not listed. The materials and guideline specifications are listed under the name of the manufacturer and/or supplier of the primary membrane material, with the exception of BUR membranes for which the reader will find RoofStar Guarantee Program guidelines on traditional built-up roofing systems (BUR) incorporating organic and glass felt primary membranes.

Insulation overlays may be specified in a Water-shedding Roof System (typically ASM) to separate the roof panels from the primary insulation, and to provide a flat, firm surface for the installation of panel clips (used with bearing plates). The table below represents a broad selection of overlays that could be used in a water-shedding roof system. However, not every material listed here may be suitable for this application. Therefore, the Design Authority may wish to consult with the manufacturer of a chosen material before specifying it. For more information about the use of insulation overlays in a Water-shedding Roof System, consult the specific roof system standards published in this Manual.