external fixtures
U-value the better the thermal performance of the product. While these values are separated out, with Uf referring to the
insulation value of the window frame and Ug that of the glass, it is the Uw value that represents the combined value of the entire window. Major innovations have taken place over the years to improve
the U-value of aluminium window and door systems. Significantly, back in 2000 you would be looking at a Uf value of 3.7 W/m²K. Today, that value is around 0.88 W/m²K due to the advances in the thermal insulation of the systems.
that ensures high levels of wind and water tightness. What this accomplishes is a system that has a Uw value of
0.77 W/m²K, ideal for use in and complementing low energy and passive buildings, incorporating low maintenance. It is ideal for architects as it provides a solution for passive
buildings and can accommodate triple glazing, offering a high performance window and door system with high water and wind resistance. As such, it is particularly suitable for use in exposed and elevated locations. There are a number of recent residential projects in and
around London that have benefitted from the use of similar high insulation aluminium products. These include curtain walling, sophisticated sliding systems and thermally improved window and door systems. Many such projects have gained an Excellent BREEAM rating, some utilising a bespoke curtain wall system.
Multi-chamber systems contribute to the thermal per-
formance of windows and doors. Such systems use patented insulation technology, which contains unique foam firmly fixed in the chamber of the insulation strip. As it is fully con- tained within the chamber, fabrication and handling are not compromised. This combines with a new, innovative gasket
CE Marking Ahead of impending legislation on CE marking, due to come into force from July 2013, some systems are ready for CE marking in accordance with European Union guidelines covering the requirements in the Construction Products Directive. This ensures complete harmonisation of products across EU countries. Development and innovation are key to the introduction
of energy saving products that will service the buildings of tomorrow and the carbon neutral goal.
enq.171
39
‘The evolution of window and door system design and thermal performance now sees the window’s U-value as a key indicator to its performance and acceptability within the building
envelope’ Paul Duffy, Reynaers aluminium
enq.172 respond online... search our information archive at
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