COMMENT 9


COMMENT Creative cavities


The requirement for an open cavity in ventilated facade systems can present a challenge when it comes to ensuring the passive fire safety of the building envelope. Graham Laws from Siderise Insulation looks at the issues, and suggests solutions


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lso referred to as ‘rainscreen’ systems, ventilated facades are designed to protect a structure, allowing any moisture that penetrates the external facade to drain away through the gap left between the exterior and the insulation layer. In addition to preventing issues with damp or mould, the air flow within the cavity allows the whole system to stay cool in summer, warm in winter, and provides some acoustic benefits. Combine this with the huge amount of design freedom they offer, it is easy to see


why these systems are a popular specification for new build and refurbishment projects of all sizes. However, this open cavity can present a fire risk if not carefully considered. If a fire entered the wall construction, this void would act like a chimney, drawing the flames, smoke and heat up the building and causing the fire to spread to multiple floors, with obvious potentially negative consequences. To prevent this happening, there is a legal requirement for the cavity to be closed


ADF AUGUST 2022


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