Epwin Window Systems says its Stellar aluminium system is ‘good to go’ when the new Part L of Building Regulations comes into force on 15 June.
Business development director Phil Parry said: “Stellar’s unique design doesn’t use dummy sashes or rebate adaptors so it’s more thermally efficient by design. Plus, its thermal breaks can be upgraded to meet the demands of thermal regulations that will only get stricter over time. It means we’re already ahead of the market and many systems will have to be redesigned and reconsidered to meet the new requirements.”
The company says the new regulations pose a problem for many aluminium systems because of the way the U value now must be calculated.
“Instead of being calculated on a 1230w x 1480h single opening casement (known as the CEN standard window), U values must be calculated on the GGF 2.2 window configuration, as used in WERs.
“This is a window with an opening light next to a fixed light with a central mullion. It’s harder to achieve the required U value on this configuration because there is more frame than in a CEN standard window. It’s especially problematic for aluminium windows that use a dummy sash or rebate adaptor to create an internally beaded fixed light next to an opener because they use even more frame.”
