On Sun, 20 Apr 2008 09:47:42 +0100, Andrew Gabriel wrote
(in article ):

In article
,
normanwisdom writes:

DG units nearly all fail sooner or later. 25 years is possible but
rare. 15 nearer the average. Nowt you can do about it except replace
them.

My first DG units had no failures in 25 years.
They had to be replaced because they had been
fitted to the old sash boxes which had gone rotten.

A common cause for failure is the sealed units sitting
in a puddle of water inside the frame due to poor frame
drainage. In cold weather, this freezes and wrecks the
seal. Modern uPVC frames don't attempt to seal against
the glass (would require more highly skilled fitters).
They rely on drainage holes to allow water which gets
into the frame to run out. Check these aren't blocked,
and when you take the units out for replacement, make
sure the channels under the unit are clear of debris
so water can run out.


Thanks. I'll try to do that when the fitter comes to fit the replacements.
(I'm not doing it myself I'm afraid :-).

--
Mike Lane (UK North Yorkshire)
To contact me replace invalid with mike underscore lane