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> How is the code still allowing new construction with windows having U of 2 (such as double glazing) its complex. but as I'm retrofitting the rules are differ

> How is the code still allowing new construction with windows having U of 2 (such as double glazing) its complex. but as I'm retrofitting the rules are different. The standards are here: https://great-home.co.uk/building-regulations-current-u-values-for-insulation-in-homes/ https://great-home.co.uk/building-regulations-current-u-valu... But the real kicker is that glazing should have bleeder vents in them, in some circumstances. Which is a pain in the arse. Most of my windows don't have them, but the two in the loft extension do.

alkonaut 5y ago
Yeah having different rules for retrofitting is understandable (Although it would be good if those who retrofit were at least required to improve the status quo of the building, if not required to bring up to the standard of new building). But what blocks the code from saying e.g. U=1.2 for new construction which is a normal (and honestly pretty cheap) triple glass window?