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In percentages how much more effective is the K glass double glazing compared to the ordinary double glazing glass? What saving could be made comparitively to the installation costs?

asked in double glazing, k glass, money

siasl74 answers:

"The U value of a single pane window is 5.6. Double glazing with ordinary glass has a U value of 2.8. Double glazing with Pilkington K Glass TM has a U value of only 1.9, considerably better than conventional double glazing, and as good as triple glazing."

The "U-value" is a measure of heat transfer rates, with units "Watts per Kelvin-square-metre", and this K-glass seems to be around 30% more efficient than regular double glazing. According to the that site, it will also benefit you more on South facing windows, but I have my doubts there as the maths seems wishy-washy.

As to what savings you might experience, that will depend on the square metreage of the windows you are replacing.

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KentPDG answers:

Without getting too technical, all the studies show that the insulated double panes outperform all other forms of glazing. Typically they have a payback (via savings) of three to five years.

Probably won't do much for the resale value of your home. However, if you plan to live there for five years or more, then do it; you will repeatedly bless yourself for having paid the extra cost to get the higher-performance glazing.

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