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Kinda anything that’s made in Germany or Austria for the European market. Go there, use any window of any age in any building, then try a 1 year old Velfac and tell me I’m wrong.
Velfac are all crunchy, graunching and squealing in operation with bendy handles, weedy seals and daft fragile locks. And that’s before you try one of their horrifically clunky, wobbly sliding door systems. You need two hands to open them. It’s madness.
I guess with thin frames there’s just not enough space to fit nice hinges, catches and seals in, for me that’s not worth a lifetime of sadness every time I open a window or door.
Velfac are the Foffa of windows. They look cool to an average shopper from a distance and that’s where it ends.
Joiners seem to like Sapele. Though a lot will come down to the tone of wood you like.
For Ali/timber I’d look at someone other than Velfac. The engineering and build is poor compared to similarly priced competitors and the customer service dreadful. Architects like them because slim frames but other than that they seem to have become ubiquitous through marketing rather than being good windows.