British Gypsum GypFloor Silent System

GypFloor Silent System is a high‑performance acoustic floor upgrade solution designed to significantly improve both airborne and impact sound insulation in buildings with existing timber joist floors. It is widely used in residential conversions, refurbishment projects, and change‑of‑use developments, where separating floors must meet the acoustic requirements of Building Regulations. The system uses specially engineered Gypframe SI Floor Channels—some incorporating neoprene acoustic isolators—to create a resilient, decoupled floor structure. This reduces the transmission of sound through joists while adding only 7mm to the existing floor height, making it ideal where floor build‑up must be kept to a minimum.

A typical GypFloor Silent build‑up includes:

• Gypframe SI Floor Channels (e.g., SIF1, SIF2, SIF4), some with neoprene acoustic isolators to reduce vibration transfer. 
• Gyproc Plank or other acoustic floorboards fixed to the channels.
• Mineral wool acoustic insulation between joists (system‑dependent).
• Optional resilient bars below the joists to further improve acoustic performance. 

Key Features

• Significant acoustic improvement to existing timber floors, meeting the requirements of BS 2750 Parts 3 & 6 for airborne and impact sound insulation. 
• Minimal floor height increase — the system adds only 7 mm, avoiding disruption to doors, thresholds and fixtures. 
• Airborne sound insulation typically 61–63 Rw dB and impact sound performance of 55–56 L’nw dB, depending on build‑up. 
• Fire resistance up to 60 minutes, tested to BS EN 1364‑1. 
• Improves performance even when access is only available from above, ideal for refurbishment. 
• SpecSure lifetime warranty when installed as part of a full British Gypsum system. 

Typical Applications

• Residential conversions and change‑of‑use projects.
• Upgrading separating floors in older buildings.
• Refurbishment where improved acoustic comfort is required.
• New‑build timber‑frame or mixed‑use developments needing enhanced acoustic separation.

White Book - GypFloor Silent

White Book - System design principles

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