British Gypsum Horizontal Shaftwall - GypCeiling Shaft System

GypCeiling Shaft System is the horizontal variant of the British Gypsum ShaftWall system, designed to create a free‑spanning, fire‑resistant membrane that can be constructed entirely from below. This makes it ideal for situations where access above the ceiling is restricted, such as service corridors, escape routes, and riser terminations. The system uses a combination of Gypframe ‘I’ Studs, Gyproc CoreBoard, Gypframe MF5 Ceiling Sections, and Gyproc FireLine boards to form a robust horizontal barrier capable of achieving up to 120 minutes fire resistance and spans up to 5100mm, depending on the specification.

A typical GypCeiling Shaft build‑up includes:

• Gypframe ‘I’ Studs (60, 70 or 92mm depending on span).
• Gyproc CoreBoard 19 mm installed between studs and retained with Gypframe Retaining Channel.
• Gypframe MF5 Ceiling Sections fixed perpendicular to the studs at 450 mm centres.
• Two layers of Gyproc FireLine 15 mm to the underside (or FireLine MR variants where moisture resistance is required).
• Optional Isover insulation for acoustic enhancement.

Key Features

• Constructed entirely from below, ideal for restricted‑access areas. 
• Free‑spanning fire‑rated membrane with spans up to 5100mm (system‑dependent). 
• Achieves up to 120 minutes fire resistance (integrity and insulation). 
• Compatible with GypWall Shaft vertical systems for continuous shaft protection.
• Uses standard British Gypsum components for ease of detailing and installation.
• Suitable for fire escape corridors, service zones, and horizontal shaft closures.

Typical Applications

• Horizontal fire‑rated membranes in:
  • Escape corridors
  • Service riser terminations
  • Mechanical & electrical zones
  • Areas where soffit access is restricted
• Projects requiring continuity of fire protection between vertical ShaftWall and horizontal closures.

White Book - GypCeiling Shaft

White Book - System design principles

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