Good News for Timber Sash Windows Following Ratings Reform
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by: forum.doubleglazing1
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The UK's national system for rating energy efficient windows, the BFRC, has announced a new method for calculating the energy efficiency on timber sash windows. The new rating system will take into account the different nature of timber sash windows and the way they are installed. The decision has been described as ‘great news’ by Brendan Ruddy of glass and fenestration industry consultancy CENSolutions.
Until now the energy rating system for timber sash windows has been close to the system used for calculating casement windows, including the whole of the box in the calculation, even though the majority of it was recessed behind brickwork.
Ruddy, a simulator for CENSolutions said: “This effectively reduced the glass area and hence the solar gain, one of the main factors involved in achieving a better rating. The new method of simulating an energy rating on a timber sash window takes into account this difference in the product and how it is fitted. What this change means in real terms for timber window manufacturers is that an ‘A’ rating, using a sensible IGU specification, is now more achievable.”
The launch of the new rating system will be delayed because new spreadsheets have to be developed, tried and tested before it can be introduced to the marketplace. CENSolutions has been among the companies lobbying hard for the new system to be implemented.
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