Grunff wrote:
how does
'poor maintenance' result in blown units? What preventative maintenance
is there which prolongs the life of sealed units?

If water gets into timber frames it might result in strain being
put on the DG units resulting in premature failure.


Anyway, the question is: am I likely to be able to replace just the
sealed units (the glass)

Yes, there will be beading holding the sealed units in, either on the
inside or on the outside. Removing this beading will allow you access to
the sealed units.

You can buy these unit at a BM or good glazier. They're
surprisingly cheap.

Possibly a workaround for the paperwork needed for fitting a
new window... just fit it, and claim to have replaced the DG
units if anyone says anything.