Most wooden sash (I assume you're talking about wooden sash) were properly fitted at the time, but are victorian or edwardian and therefore over 100 years old. They've done pretty well considering their heritage. New wooden sash with double glazing are better IMO than plastic windows - as the parent noted, plastic doesn't do well long term when exposed to light.
>New wooden sash with double glazing are better IMO than plastic windows
Hugely, I think it's a testament to the design that they still look great today. Double glazed wooden sash windows are however much pricier than a uPVC alternative which puts them out of reach of many.
So then, we all agree that the old (ancient) and unmaintained wood frames in the UK are crap. Cool! :)
Really, I couldn't care less if they replaced the frames with wood or whatever, as long as they made sure that they were thermally good and avoid wasting all of the heat...
