The Natural Philosopher wrote:
Terry D wrote:
Six windows of my house are fitted with Everest secondary units, still in
excellent condition after over 20 years. However, the wooden window
frames
are now deteriorating.

Instead of replacing the whole lot with PVC double glazed units, would
it be
feasible to simply replace the wooden frames with either wood or PVC
single
glazed windows, retaining the inner dual glazing, hopefully without
disturbing it. This presumably would be much cheaper and also the
soundproofing is excellent due to the 100mm gap between panes.

Terry D.

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Don't see why not...I assume its the outer windows that are deterioating?

I suppose you would fall foul of FENSA regs if you replaced that which
adjoins the brickwork. But would anyone care? Perhaps if you left 1mm of
the original frames in place, you could class it as a repair