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Low emissivity, reflective membrane technology is ideally suited to timber panel construction


The correct use of internal and external reflective membranes will effectively block infrared radiation and increase the thermal performance of the airspace, allowing low target U-values to be met


enables developers to meet stringent targets without impacting on the timber frame construction process or significantly increasing the cost of manufacture. To the owner and occupier, the long term integrity of the AVCL and the internal/external breather membranes will ensure that the full design benefits of a thermally efficient envelope are achieved and ultimately enhanced due to the use of reflective technology.


How does a low emissivity cavity work?


When using reflective membrane technology, the use of high purity, solid aluminium foil on the surface ensures the membrane forms a radiant barrier when facing at least a 20 mm unventilated airspace within a wall construction. This creates a low emissivity cavity, which significantly reduces heat loss and raises the thermal resistance of the airspace when fixed as per standard timber frame/stud practice and rafter centres.


The correct use of internal and external reflective membranes will effectively block infrared radiation and increase the thermal performance of the airspace, allowing low target U-values to be met.


How can manufacturers help? To ensure that the right product is used appropriately within a timber frame panel to provide the required performance, an experienced manufacturer should be consulted – one which offers a full range of wall construction membranes and can ensure a solution based approach. Some manufacturers offer a free U-value calculation and condensation risk analysis service using membranes as part of the build-up to assist specifiers with their overall design.


Adam Ford is head of technical and John Mellor is product manager at Protect Membranes


WWW.ARCHITECTSDATAFILE.CO.UK ADF AUGUST 2018


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