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I agree, putting two panes of glass together without a means of ventilation or to clean will result in condensation and bugs etc. Also, when the condensation starts to act on the lead it will cause discolouration and staining. In my experience premature failure of normal sealed units is almost...

Most modern secondary glazing systems can be selected with a tilt-back facility so you can get to clean the inner panes of both the upper and lower panes

Pilkington Spacia is a unique product and shouldn't be under estimated. It's actually made in Japan so shipping adds cost. But the cost is off-set by less labour needed to deepen the rebates of original Victorian style windows. I've installed in into period properties many years ago and it is...