British Gypsum GypLyner Xternal System

GypLyner Xternal is a through‑the‑wall external infill system developed by British Gypsum, Isover and Intrastack as part of a full Saint‑Gobain external wall solution. Designed for multi‑storey buildings using non‑loadbearing Steel Framing Systems (SFS), it provides fully tested fire, acoustic, and thermal performance backed by comprehensive technical evidence. The system wraps British Gypsum and Isover products around an Intrastack SFS frame to create a robust, high‑performance external wall build‑up. It is tested to BS EN 1364‑1 for fire resistance and BS EN ISO 10140‑2 for airborne sound insulation, with multiple specification options to meet Part L thermal requirements. Saint‑Gobain positions GypLyner Xternal as a complete, warranty‑backed solution, combining the SpecSure system warranty with the Intrastack design‑life warranty.

A representative GypLyner Xternal specification includes:

• Intrastack SFS framework (e.g., 100mm studs).
• External sheathing: Glasroc X Sheathing Board 12.5mm.
• Cavity insulation: Isover Acoustic Partition Roll (APR 1200) or Isover Polterm Max Plus depending on thermal requirements.
• Internal linings: typically two layers of Gyproc SoundBloc 15mm.
• Joint treatments and accessories: Glasroc X Sealant or Sealing Tape, Gyproc Sealant, Gypframe fixing straps.
• Finishing to the internal face is achieved using Thistle / ThistlePro plasters or Gyproc jointing systems.

Key Features

• Complete through‑wall SFS infill solution combining British Gypsum, Isover and Intrastack components.
• Fire resistance tested to BS EN 1364‑1 with performance options of EI 60, EI 90 and EI 120 minutes (inside‑to‑out and outside‑to‑in).
• Acoustic performance up to Rw 56 dB.
• Thermal performance flexibility, supported by a range of Isover insulation solutions and 3D U‑value calculations.
• Detailed installation guidance for junctions, abutments, windows and deflection heads.
• Covered by the Saint‑Gobain full system warranty (SpecSure + Intrastack).

Typical Applications

• Multi‑storey residential, commercial and mixed‑use buildings.
• External wall infill panels within steel or concrete primary frames.
• Projects requiring tested, warrantied fire, acoustic and thermal performance.
• Developments seeking a single‑manufacturer, fully coordinated through‑wall solution.

White Book - GypLyner Xternal

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