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Rigid Foam Insulation

Rboard® Rigid Foam Insulation - Wall Sheathing

Atlas Rboard® rigid foam insulation is a closed cell polyisocyanurate (polyiso) foam core, faced with a non-reflective coated glass-mat facer on both sides. Rboard® combines high R-value, enhanced durability from two coated glass-mat facers, and water resistive attributes in a high performance rigid insulation board. Wall sheathing is suitable for a variety of continuous insulation (CI) applications. Panel sizes are 4' by 8' or 4' by 9'. Insulation panels can be supplied in nominal 16" or 24" widths for use in cavity wall applications. Custom sizes are also available.

Atlas polyiso has been tested for VOC and formaldehyde emissions, in which reported emissions were below the maximum emission levels allowed under both the GREENGUARD and GREENGUARD Schools and Children criteria. These tests confirm that Atlas polyiso insulation systems are all very low-emitting products.


Data Sheet-US | Data Sheet-Canada | Data Sheet-Canada French | Warranty

Rboard® Rigid Foam Insulation Applications

Rboard® Rigid Foam Insulation wall sheathing is recommended for use in residential applications as well as Type V light commercial construction. The glass-mat facers enhance the board’s durability in a similar manner to their use on exterior glass-mat gypsum boards. The glass-mat facers are more permeable than foil facers. Common applications include:

  • Exterior or interior (with a thermal barrier) insulated wall sheathing for walls framed with wood or steel studs
  • Exterior cavity walls
  • Exterior or interior CI (with a thermal barrier) for cmu/block/concrete wall systems
  • Exterior CI for installation over wood or gypsum sheathings
  • Use over existing cladding to improve energy efficiency and provide a level surface prior to installing a new cladding
  • Approved for use in attics and crawlspaces without requiring or the use of a thermal barrier (ICC-ES A12, Appendix B)

    Water Resistive Barrier System

    The use of Rboard® Rigid Foam Insulation can be considered a WRB assembly and potentially part of an air barrier assembly. In these types of installations it is required to tape or seal all joints between boards and at penetrations and openings. Atlas recommends sealing into rough opening flashing and to other portions of the building, including the roof and below grade. Atlas Rboard® coated glass-mat facers are compatible with most standard joint fillers, sealants and adhesives. Consult the product manufacturer for specific compatibility. WRB Tapes and System


    • This product will burn and may contribute to flames and smoke spreading.
    • Design use of this product must always follow local codes, especially with regards to WRB, Air Barrier and Vapor Retarder. Atlas highly recommends the use of a dew point calculation of the proposed wall assembly to determine the types and locations of weather resistive barriers as well as needed insulation thickness/R-value to mitigate any condensation potential.
    • Rboard® is not a structural product, local codes must be followed for bracing requirements.
    • Storage: Boards should be stored indoors. If left outdoors for any length of time, keep dry by covering completely with a waterproof tarpaulin. Store on flat pallets elevated at least 4" above the floor or ground and standing water.
    • Follow the cladding manufacturer’s recommendation for attachment of the cladding.
    • Rboard® is not intended to be exposed in excess of 60 days. Atlas recommends that all of the wall cladding material be installed within 60 days of installing the product.

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    Polyiso Wall Insulation