Double Glazing - ruddy cold draughts.

[Sirbendy]

I live in a Wimpey No-fines house that had the external insulating render, a rewire and double glazing fitted in 1997. Now, I know the units are knocking on a bit, and certainly one needs a new hinge, but at night if you fail to draw the curtains fully, theres a hell of a cold draught.

One in particular seems ineffective at noise damping as well. All have the trickle vents fitted.

Am I expecting too much of the DG? Is it usual to sit behind a window and feel like I'm sat under an aircon unit? Or is it likely our units are in some way in need of adjustment..? All bar 1 seem to shut tight - the A4 sheet test grabs quite firmly..but they're still a prime cause of cold draughts...

 

[JohnD]

you need to decide if there is cold air blowing through gaps between the window frame and the wall (expanding foam, topped by decorators caulk or plaster will fix it); or the seals between the opening window and its frame (possibly the hinges or catches need adjustment) or if it is simply chilled air flowing down the inner glass surface like a waterfall.

Smoke from a joss-stick or similar will help you see the air currents.