Secondary Glazing v uPVC Double Glazing


To retain the original character of traditional windows, it is often a consideration to replace the original single glazed glass with a double glazed sealed panel. This will provide some thermal enhancement, however, it is usually fairly minimal as it does not prevent draughts or heat loss through the frame structure. The air gap in the sealed unit can only be a few millimetres to enable the unit to fit within the existing frame (Low E coatings will not function). This is known to have a poor insulating quallty. Also, there are no soundsproofing benefits to be gained by this procedure.


If you are weighing up the benefits of Secondary Glazing over uPVC double glazed windows, look at the comparison chart below. Also, these articles may help:
http://news.bbc.co.uk A plague of plastic windows?
http://www.bbc.co.uk Fitting secondary glazing
And, download this technical paper by Historic Scotland:
Improving the thermal performance of traditional windows (see P13 & P14)

  Secondary
Glazing		 Double
Glazing
Can improve thermal efficiency of traditional single glazed window by 60%+ Yes Yes
Best solution to reduce intrusive noise Yes No
Installed to existing double glazing to further enhance acoustic performance Yes No
Retains the character and heritage of a property Yes No
Preferred choice of conservation and heritage officers Yes No
Increases desirability and value of a period property Yes No
Contributes to carbon emission reduction Yes Yes
No long term damate to the environment (recyclable) Yes No
Effective cost recovery by reducing heating bills Yes No
Installation available within 3 weeks from order Yes No
Simple installation with no post decorative work Yes No
Improved living environment Yes Yes

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