Cladding materials are generally attached directly to the structural framework or components of a building (e.g., studs, girts, etc.). However, where FPIS is used on the exterior of a building, there is opportunity to not only reduce heat loss through thermal bridging of framing members but also an opportunity to reduce thermal bridging through cladding connections. Properly specified cladding connections (fasteners) through foam sheathing can dramatically reduce heat loss thermally inefficient methods such as Z-furring extending continuously through one or more insulation layers.
Fasteners can be specified to penetrate an exterior continuous insulation layer allowing furring or siding to be placed directly over the exterior insulation. The fastener type and schedule will depend on cladding weight, method of attachment (furring or direct), and type of structural substrate (steel framing, wood framing, or wood structural panel fastening base). Such provisions are included in the 2024 and earlier editions of the IBC and IRC. Refer to Section 1404.5 of the 2024 IBC and Section R703.15 and Section R703.3.3 of the 2024 IRC.
For additional guidance in fastening through FPIS, refer to:
- Quick Guide: Cladding Connections to Wood Frame Walls with Foam Plastic Insulating Sheathing (FPIS) Continuous Insulation (ci)
- Standard: ANSI/ABTG FS200.1, Chapter 4, Connections Through FPIS
For additional information on cladding and other attachments through FPIS, refer to our page on Cladding Connections.
NOTE: The ANSI/ABTG FS200.1 Standard provides prescriptive fastening schedules consistent with those included in the IRC and IBC. It also provides the engineering basis for designing cladding and even light structural connections through foam sheathing to the underlying structure. These provisions provide more solutions than included prescriptively in the building code.
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