Posts tagged with:
sash
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Sash windows can get to 1.6W/m2 U value! from mattstan51 23 days old
http://tinyurl.com/yghzwgk English heritage research
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decent thin double glazed units from mattstan51 162 days old
http://tinyurl.com/qvkclu useful for conservation and sash windows - made by Pilkington
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