FIS Safety Alert: Suitability of gypsum-based systems in the construction of smoke shafts
Concerns have been raised with FIS that gypsum-based systems are being specified to construct smoke shafts for mechanically ventilated systems in some high-rise buildings. Members are advised that gypsum-based systems are typically tested for fire resistance, sound insulation, air permeability and robustness. These tests do not replicate the pressure differential conditions or measure leakage at ambient or elevated temperatures which may be required for this application.
Members are advised to be watchful for this detail in their tender requests and project specifications and seek clarification, especially where any specific requirement to meet performance in accordance with BS EN1366-8, the shaft is classified to BS EN 13501-4 or elevated negative air pressures are referenced. On design matters members should seek clarification from the Principal Designer and/or Engineering Services Designers and consult with Manufacturers with respect to any live or legacy specifications. They are also reminded to be watchful for any clauses in contract that may leave them with responsibility for the design, compliance, or cost of demonstrating compliance of such details.
If you have additional questions, please contact the FIS Technical team on 0121 707 0077 or email jamesparlour@thefis.org or joecilia@thefis.org
Subsequent to the publishing of above statement on the 3rd May 2024 the Smoke Control Association has issued a statement recommending that the materials and products used for smoke control ducts and shafts are tested in accordance with the test standards referred to in BS EN 12101-7 for multi-compartment smoke control ducts which is BS EN 1366-8.
BS EN 1366-8 covers air leakage, integrity, insulation, maintenance of cross-sectional area and mechanical stability under pressure, characteristics which are detailed within BS EN 13501-4.
The full statement from the SCA can be viewed here.