The Overall Thermal Transfer Value (OTTV) of building facade is controlled in many big cities in East Asia such as Hong Kong and Singapore for building energy conservation. For example, the OTTV is limited to 20 Wm~(-2) in Hong Kong to reduce solar heat gain. Buildings are also sealed up to reduce cooling load of the mechanical heating and cooling systems. Therefore, heat generated in an accidental fire in well-sealed buildings with low OTTVs would be trapped indoor. The time to flashover would then be shortened. In this paper, fire safety of concealed green buildings with low OTTVs will be discussed. A heat balance equation in a compartment fire was set up. Common buildings materials including brick, concrete, gypsum plaster, glass panels, fibre glass composites and timber were then evaluated. Facade materials are proposed to be tested under flashover conditions.
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