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condensation in double glazing

PostPosted: Sat Aug 02, 2008 4:58 pm
by Jane
This is not really a DIY query but I don't know where to ask.I have had new bespoke hardwood double glazed windows fitted. During the winter there was a small amount of condensation occurring at the base of each unit. The manufacturer told me that this is normal. I never had this problem with the old PVC units I replaced. Nor have I seen the problem abroad with wooden units. What is the explanation and should I insist that they are re-done?

Re: condensation in double glazing

PostPosted: Sat Aug 02, 2008 6:25 pm
by John Gallon
Hi Jane,
Is the condensation between the two panes of glass or is it on the room side? If it is between the panes then you have a claim (within the guarantee period).
If the condensation is on the room side it could be cold bridging across the solid wood frames, PVC frames are better insulated with air spaces in the frame to stop cold bridging,
John

Re: condensation in double glazing

PostPosted: Sun Aug 03, 2008 9:57 am
by Jane
Thanks John,
It is between the panes- about 2" at the bottom of each window.
Jane

Re: condensation in double glazing

PostPosted: Sun Aug 03, 2008 11:26 am
by John Gallon
Hi Jane,
This is not "normal" and shows a fault with either the fitting of the glass units or faulty units, either way you should have a claim under your guarantee unless it has run out.
This problem happens more often with wood windows than with PVC usually because there is not the room for movement of the glass as the units expand and contract more than single glazing and the seal can break. In wood windows the glass units should be bedded in with butyl putty which does not set hard and allows for movement in the glass.

Re: condensation in double glazing

PostPosted: Sun Aug 03, 2008 12:01 pm
by Jane
Hi John,

Thanks for that. I will take it up with the joiner.

Jane