retrofit of double glazing

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anyone know of any decent double glazing products that can be retrofitted to existing windows? that's actually a double redundancy, right there. what i want is a product or even an idea of how to create the same effect, a thermal barrier, as double glazing in existing plate glass shop windows. any suggestions?


Read and reply to the full thread at RenovateForum.com.... (http://www.renovateforum.com/f84/retrofit-double-glazing-112584/)