This is because glass lets in solar heat and daylight – which are a positive energy contribution, and not taken into account by the U value. Indeed, the work we have done through the Industry Advisory Groups has shown that it can be counter-productive to 'improve' the U value of windows, because the technologies involved in doing so can have a detrimental impact on these positive aspects of the glazing.
'That is why we are strong supporters of the new Window Energy Rating Scheme, which takes all these factors into account. It has been developed to rate domestic replacement windows, and we would wish to see Window Energy Ratings introduced as a means of demonstrating compliance for replacement windows in the new Part L. It has been developed along the lines of that which is already seen associated with 'white goods', and something that the consumer could easily understand and will also complement the investment the Government has already made in this area.
With the growth of the conservatory market, the Government sees the potential for increasing problems occurring for members of the public. The GGF is concerned that a FENSA style scheme would not be introduced if conservatories are brought back within the scope of Building Regulations, and made this point.
Fire Safety, Insurance Backed Warranties, and Training and Skills Shortages were among the other items covered.
Source
Glass Age
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